Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f71d0b62499c77c…

MALICIOUS

PDF

81.7 KB Created: 2021-09-10 09:18:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 209d744174ad7867d2ab9303bb939efc SHA-1: ec98342e0f3c699b62fe33a008c1f1376444d230 SHA-256: 3f71d0b62499c77ce5d67596e9d60c01057332970bd4b0a932914db040a67ba2
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to disposable hosting or compromised CMS uploads, suggesting a link farm designed to redirect users. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway scanning. ClamAV detection and ML classification confirm its malicious nature, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://bernardthevenet.fr/ckfinder/userfiles/files/23064687209.pdf In PDF document text
    • http://terralis.eu/catalogue_dynamique/file/vaxevumujibelimokogev.pdfIn PDF document text
    • http://axi-hohenstein.de/userfiles/file/gotinakizesukusenemu.pdfIn PDF document text
    • http://sbairs.com/datas/files/33641658655.pdfIn PDF document text
    • https://kuepancong.com/contents/files/vajizanepe.pdfIn PDF document text
    • https://quangtriasianwindow.com/uploads/image/files/gekoxomewolijuzalekotori.pdfIn PDF document text
    • http://copingconversations.com/userfiles/file/gefarevej.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/0omku71upcgdtk1emkoppfc153/62399700015.pdfIn PDF document text
    • http://tznjl.com/userfiles/files/kavijozeforidoz.pdfIn PDF document text
    • http://fewo-spreewald-schoetzigk.de/brandenburgtag/img/editor/file/zigupega.pdfIn PDF document text
    • https://przygodanaukrainie.pl/admin/ckfinder/userfiles/files/pixuzuwakizu.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/161356a074f567---40898275180.pdfIn PDF document text
    • http://umhouses.com/uploads/files/34008350343.pdfIn PDF document text
    • http://mayinmaunhat.com/upload/files/nabojikiwopakawigowojo.pdfIn PDF document text
    • https://fajndoktor.cz/images/file/files/85541227175.pdfIn PDF document text
    • http://asr-net.ru/uploads/files/zaxoxirugisonenagokolibi.pdfIn PDF document text
    • https://itracmediav5.com/ckfinder/userfiles/files/89268556024.pdfIn PDF document text
    • http://157.230.241.115/image/upload/File/galerizifewod.pdfPDF link annotation
    • http://pretaporter-pegah.com/userfiles/file/banomebudukewus.pdfIn PDF document text
    • http://baggiez.net/userfiles/file/xezamakosufunigap.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/4e9ba9e1a063568b2c0dbb64feeebddf/dexelizedilunubez.pdfIn PDF document text
    • https://reformedgeneration.com/userfiles/file/donejamolalox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=free+file+explorer+androidPDF 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_off0000d938.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD938 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f14a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF14A 18648 bytes
SHA-256: 313572e1e8eff34d4836b386a96504b94e99a500c849bbd5fef0404d86b2286c
font_02_sfnt_off0001224f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1224F 10304 bytes
SHA-256: 6a2c018c1ba60f08a2ccce8732f087fc1f09bd65bc24989e62f311c12eb53cc0

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