Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac7f9841e0c8a425…

MALICIOUS

PDF

66.9 KB Created: 2021-09-26 09:55:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1ea9e7fa68a1e69d19a8fd51e735e2f9 SHA-1: 2e06e508e3c92541be4b7fc392c358944ae83af5 SHA-256: ac7f9841e0c8a4257e47bae25d8a64e22094221bda4fa8517eec779290031893
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file is identified as malicious by ClamAV and a machine learning classifier, exhibiting characteristics of a phishing lure. It contains numerous external links, many pointing to compromised WordPress upload directories, suggesting an attempt to host malicious content or redirect users. The heuristic 'PDF_IMAGE_LURE' indicates the document likely presents a screenshot to obscure a clickable link, a common tactic for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 66 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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.
  • 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://allytemp.ru/uplcv?utm_term=how+to+do+the+video+lock+screen PDF link annotation
    • http://prinsart.ro/uploads/files/58067683630.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132838a66b8b---31614019636.pdfIn PDF document text
    • https://nusantarabet4d2.com/contents/files/nudomoti.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6a2aac1c6---pijamivavokovofubojuvep.pdfIn PDF document text
    • http://s2ipower.com/survey/userfiles/files/xataw.pdfIn PDF document text
    • https://datawire.gr/files/files/lizoruwixi.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/161365d1897ae2---tozabedupomugogotezowa.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16137046051919---xavarelawusomekobuwoko.pdfIn PDF document text
    • http://dienmaythanglong.org/uploads/files/resanonegivejanoxekusu.pdfIn PDF document text
    • http://nikolalepojevic5.com/multimedia/file/gawejoreduzewaxu.pdfIn PDF document text
    • https://binarbaidservices.com/public_html/userfiles/file/kanebijesifagamugoroxarug.pdfIn PDF document text
    • https://dalilak1.com/userfiles/file/vumujorunonufubawirakopot.pdfIn PDF document text
    • https://motecx.com/images/file/71941327130.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/66405166899.pdfIn PDF document text
    • http://kochamsushi.pl/UserFiles/file/nenobivonixu.pdfIn PDF document text
    • https://cplastik.com/data/cms/file/94436216668.pdfIn PDF document text
    • https://ojazzdance.fr/userfiles/file/12640363349.pdfIn PDF document text
    • http://vuatoyen.com/uploads/userfiles/file/98734983936.pdfIn PDF document text
    • http://markasib.ru/ckfinder/userfiles/files/80369515036.pdfIn PDF document text
    • http://apothepharma.com/upload/files/91946387762.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/xuxujizijiximinonaja.pdfIn PDF document text
    • 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000aaee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAAEE 10540 bytes
SHA-256: 00305b7b1df739ca4840ed96cd45d566e446d9c5b57e0788afee671bcb2261f7
font_01_sfnt_off0000c2df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000daf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF1 14232 bytes
SHA-256: 041cc85f59d74411cff1648944509c4e066fc4fdbe70e8a1e9a5cbc9bfee98a4

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