Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b6994a05cd6233b…

MALICIOUS

PDF

74.9 KB Created: 2021-08-23 17:18:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4634ca71679e3c8dd9f8d5b702b28e16 SHA-1: 28151ea00ddf56bcc15ba1f005629a7eda08444c SHA-256: 9b6994a05cd6233b4756f52b6f22ffb0e95654d8a1e8b56000f6596740b52afb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. It functions as a link farm, with numerous embedded URLs pointing to potentially compromised or disposable domains, suggesting an intent to lure users to phishing sites or download further malware. The presence of external URI links and link farm characteristics strongly indicates a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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.
  • 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://trips-in.com/ckupload/files/lapusalukuwirusimilabux.pdf In PDF document text
    • https://kstraders.com/userfiles/file/tamixajekogofubamoderat.pdfIn PDF document text
    • https://coverline.ro/userfiles/file/17553226059.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610b5f78678d1---93062087635.pdfIn PDF document text
    • http://xn--eyt274i.com/upload/files/zawenefajobesasolalu.pdfIn PDF document text
    • http://roycraft.ca/userfiles/file/vuzokak.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/42de937ae4dd68de1666481b0ba47231/jinogimiwidaze.pdfIn PDF document text
    • http://ippinnudon.com/uploads/files/bikamevabot.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/mq9tnprjtn8s77vf9mp70ak2mk/61944245617.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2aea5da942---dagivuzometota.pdfIn PDF document text
    • http://anapro.com/ckfinder/userfiles/files/72684301619.pdfIn PDF document text
    • https://tylbm.com/Upload/ckeditor/files/nisesapure.pdfIn PDF document text
    • http://shtaket46.ru/page_edit/_samples/userfiles/files/21499508611.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/sutemezupewujejowat.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa85c79af2---67220161088.pdfIn PDF document text
    • http://siripanyalamphun.com/user_img/files/61142063454.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16089ca8fca37d---peximenejabovajizobusor.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1610869aab8c68---7363731742.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/81713878ed49973a5d877e383e0cdea5/17085237420.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///37815370956.pdfIn PDF document text
    • http://ecofincas.net/ckfinder/userfiles/files/wuvuneboguximovazik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=r+ts+functionPDF 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_off0000c35f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC35F 10032 bytes
SHA-256: 9c86a7cbd6c55b026d7b16ff07305ef4a732e10f5c567b59a9c94441cf58fe7e
font_01_sfnt_off0000d9d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f1e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E6 16704 bytes
SHA-256: 8290341114613028a6d98816bedfc09c1ef6b799685587281bfdb097ec13a6a8

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