Malicious PDF — malware analysis report

Static analysis result for SHA-256 57b32125d2a68f55…

MALICIOUS

PDF

96.7 KB Created: 2021-07-07 10:44:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 708d9967fbfbaee22e1866a70554eaa6 SHA-1: 35b6944d875e160bbaccba2719c8ba7c6df8724c SHA-256: 57b32125d2a68f55eb1be7e3eaba0d1ba542792123bb519ca8c59c885f529591
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. Heuristics indicate it functions as a link farm and a callback phishing lure, prompting the user to call a phone number for a fake issue. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it is designed to lead users to malicious content or initiate fraudulent phone interactions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9746

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) or Microsoft license-boilerplate documents that carry no urgency or charge/dispute escalation.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://autosaloncenter.com/uploads/file/54573074917.pdf In PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1bcf4398e2---pufuxifedanosogafisov.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/06697092225be52b2d0e62b9ff78e6db/33738554842.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/ncsr7lnbd4t30dq438ou7q8krm/kovaluxuzu.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16099a92109963---suruxogoduwurajejikoloxo.pdfIn PDF document text
    • https://qfuse.it/images/uploaded_files/ckfinder/files/1624890030_f818ab87cb.pdfIn PDF document text
    • http://uniroll.pl/user_images/file/95684455882.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e929aeb2be---55354559440.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/5ddec9ffaaa1851d1d5f7448be9ccae4/tatuloxugale.pdfIn PDF document text
    • http://westmoorclassof1965.com/clients/5/52/52ec68f2b927accf75267cb07bfcc891/File/xinefudobexete.pdfIn PDF document text
    • http://bygreenpure.com/userfiles/file/11152795057.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/1a3873bfcb07a7209421993879bae96d/guvadegadafowijibeb.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a90beb08ed4---70240126978.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607608c53a74a---74541419805.pdfIn PDF document text
    • http://pn-tech.net/userData/board/file/57956566000.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///wozevotali.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/70486320324.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b98efb50f52---wawusajifavo.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/j2fuulajs4atcd5t41unurpds4/vofik.pdfIn PDF document text
    • http://rolmech-strzelno.pl/Upload/file/zafupupiranedudufone.pdfIn PDF document text
    • https://uniontend.com/userfiles/files/72455663596.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/fuduserevorepawu.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d90e711ecf7---fikigobexaribozavagofira.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16083e89d0dd00---55090385228.pdfIn PDF document text
    • https://ikima.fr/uploads/file/lexavukakejeredovud.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/5e4f4dbe7661ed15a5cbe2923b28b9ae/miwowesisovox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=not+answering+phone+calls+synonymPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00013f38.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x13F38 17908 bytes
SHA-256: 1f351311d3db9ac013accc8c9887ef1defb89f0c66014b2547a64812eb7667ee
font_00_sfnt_off0000f9a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A3 17432 bytes
SHA-256: 0511d332c5d53e4f6b1489301c1f07e5a0ae9939c42a9b1a30a5a0d98566dcad
font_01_sfnt_off00012727.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12727 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00015b1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B1E 10996 bytes
SHA-256: 27cd3abf3fe1ecdb7a1d755f4064d28c32c468b1b7d34c9bdcabf4def3b5292d

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