Malicious PDF — malware analysis report

Static analysis result for SHA-256 05dceab7c620ea90…

MALICIOUS

PDF

93.3 KB Created: 2021-09-15 21:44:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: a1f25dea9fb79b3a789441bc4df65ef1 SHA-1: ce67a668ab0602e1bb32f8f1594cea3faa2c48bb SHA-256: 05dceab7c620ea909bf9407e97ad7bdb45e1eab761dac8fb488259b21065bc66
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many of which point to other PDF files hosted on potentially compromised or disposable domains. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a pattern of link farming and abuse of content management systems. The 'SE_CALLBACK_LURE' heuristic suggests a phishing or tech-support scam pretext, aiming to trick users into interacting with the provided links. While no scripts were directly extracted, the nature of the links and the overall structure suggest an attempt to direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • 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 http://aeusjtu.pretty-match.com/upload/files/ketaradabitawu.pdf In PDF document text
    • http://geyikkimya.com/userfiles/upload/file/vovexolesidez.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/file/nigutaxalilun.pdfIn PDF document text
    • https://krzczonowice.pl/gfx/file/sizomanivokusajekalapub.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/6f78208qcia9nl6g236mj8sgs1/musumumifinunajiji.pdfIn PDF document text
    • http://barefoot.pl/userfiles/file/bokorif.pdfIn PDF document text
    • https://irantruck.ir/data/file/ledagej.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161303c6aa0c24---nidavi.pdfIn PDF document text
    • https://bahispesinde.com/gnc/veri/_files/86233273057.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/7a309f8e353ec56b8d172a8d360de4a7/57286747605.pdfIn PDF document text
    • https://pointswestliving.com/ckfinder/userfiles/files/23663499243.pdfIn PDF document text
    • http://abcbyspu.com/ckfinder/images_store/files/jiwubonosigakatagin.pdfIn PDF document text
    • https://namphuctourist.com/userfiles/file/dawokefukoxowumuwilanokes.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/87764307233.pdfIn PDF document text
    • http://toshiteriyakiburien.com/uploads/files/powidovitavilaganetusunel.pdfIn PDF document text
    • http://easytravel63.ru/ckfinder/userfiles/files/lenetuvoxij.pdfIn PDF document text
    • https://daulte.ch/ckfinder/userfiles/files/sotivowekodo.pdfIn PDF document text
    • https://truckforceone.com/upload/editor/file/wilasuxaxupibekirijijoji.pdfIn PDF document text
    • http://katachizu.com/img/news/files/kikadokitonuvi.pdfIn PDF document text
    • http://ippinnudon.com/uploads/files/89833705430.pdfIn PDF document text
    • http://kor-ra.ru/UserFiles/file/muzudigimemoreliperufatit.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/zedabebovisasa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=spatial+diffusion+definition+geographyPDF 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_off0001033d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1033D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011b4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B4F 19352 bytes
SHA-256: f8b150b047d3001e141cdbad3eabdf9b653cda7754d5173c30777b10e286a778
font_02_sfnt_off00014e26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E26 11064 bytes
SHA-256: 95e11951615716629f4aea9b858e80e8d429428357fee4673b85791194dfef33

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