Malicious PDF — malware analysis report

Static analysis result for SHA-256 432541a13cd77b2c…

MALICIOUS

PDF

90.7 KB Created: 2021-09-08 01:58:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: fe0646d3f3a847cee12fed86cb980171 SHA-1: fc8e9cc154e1060e3e463753180787e331043214 SHA-256: 432541a13cd77b2cd1eb47a20418ff7f99766aa84133ca128f4edd801cae4d28
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to potentially compromised websites and is flagged by ML classifiers and ClamAV as malicious. The 'SE_CALLBACK_LURE' heuristic indicates the document's content is designed to trick users into calling a phone number, a common tactic in tech-support scams and callback phishing. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure suggest an attempt to redirect users to malicious content or initiate a fraudulent interaction.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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) 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://mavibusiness.it/file/87341234711.pdf In PDF document text
    • http://www.tecnobor.com/ckfinder/userfiles/files/panigoxogejasowijasaw.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/28454914025.pdfIn PDF document text
    • https://planet-pvc.com/upload/files/tekigeviwisaxorefanekoveb.pdfIn PDF document text
    • https://takitech.hu/userfiles/file/29105846770.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/fd71ddad317ba46365c4052458ad7321/vifusisuferam.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/7miaprf2ht2edhepje00c3iopp/83755572955.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/xujebozawagixaxi.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/qtqa5a8l92jet03qc61qgt33mp/subegokosofesunav.pdfIn PDF document text
    • http://ebiocell.com/uploadfile/file///2021071304515918.pdfIn PDF document text
    • http://fabtur.ru/upload/files/54976142594.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609a02481c186---vademufofofavom.pdfIn PDF document text
    • http://pc75.net/upfiles/file/1627466818.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-2/20210502234449399720.pdfIn PDF document text
    • http://f-kcc.jp/user_data/userfiles/files/lujowob.pdfIn PDF document text
    • http://willowslakerhea.org/userimages/62825915249.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///83761316712.pdfIn PDF document text
    • https://lifecareproduct.in/ckfinder/userfiles/files/kinatetototiv.pdfIn PDF document text
    • http://olympusflights.com/files/files/98569269254.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab3e423a97e---79250754379.pdfIn PDF document text
    • http://pensionpoint.cz/userfiles/files/49618637036.pdfIn PDF document text
    • http://www.ufolep-69.com/contenus/files/23342059838.pdfIn PDF document text
    • https://membermimpi.com/contents/files/2975669154.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=advantages+of+participant+observation+pdfPDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fda9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000115c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115C0 10936 bytes
SHA-256: 720ec48342b4d8061d7ae7c3c79691fcf8d0f7558ec7318edb5654b3deeb84bf
font_02_sfnt_off00012edf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EDF 17792 bytes
SHA-256: 2b4139c12046be19cf8a69ff963ceb522f1d922a30f9223efc5c8c4d0c170c3e

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