Malicious PDF — malware analysis report

Static analysis result for SHA-256 86d22d3c785d2855…

MALICIOUS

PDF

85.1 KB Created: 2021-10-09 02:22:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 01184404cbdcd713f0f8a9f6c02fcf4e SHA-1: e5451aa28169619345e3e4b1588a2126ce7273a8 SHA-256: 86d22d3c785d2855aa1267c0396c6227175969675ce2fe7e02e679a78bb3bfbc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress upload directories, suggesting an attempt to host malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the presence of numerous external links and the PDF's structure point towards a lure for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614119d8be413---75798511925.pdf In PDF document text
    • http://sfipl.in/userfiles/file/85221483824.pdfIn PDF document text
    • https://nichecnk.leaddeehub.com/userfiles/files/wabafulofaxef.pdfIn PDF document text
    • http://ebrinteractive.com/userfiles/file/povapifejalowed.pdfIn PDF document text
    • http://jingluo.net/uploadfiles/files/12332036970.pdfIn PDF document text
    • http://samuiluxurytravel.com/Uploads/file/katuwuresomutuv.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147cca6c9f8c---14837662473.pdfIn PDF document text
    • http://pure-chiral.com/upload/files/zonejabepenum.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16151e8c8d72bd---wanajigiwiwimosu.pdfIn PDF document text
    • http://wych123.com/upload/files/55358554880.pdfIn PDF document text
    • https://www.alliance-educationsexuelle.ch/ck/ckfinder/userfiles/files/94964328759.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16160b76908616---32691459622.pdfIn PDF document text
    • http://alconsprom.ru/ckfinder/userfiles/files/79226817212.pdfIn PDF document text
    • https://wangwangcamp.com/uploads/files/202109040025274037.pdfIn PDF document text
    • http://e-sportis.com/images/upload/kerinude.pdfIn PDF document text
    • http://rzn-house.ru/upload/file/deboviradajinadi.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16157075aed2ed---84424454613.pdfIn PDF document text
    • http://www.klimavill.com/data/editorfile/58691996970.pdfIn PDF document text
    • https://vinamex.info/uploads/news_file/solavugonagobodijewaxu.pdfIn PDF document text
    • http://orenprom.com/img/account/file/xirilokonulenajuzobabani.pdfIn PDF document text
    • http://tuhocxuatnhapkhau.com/uploads/ckfinder/files/42619562011.pdfIn PDF document text
    • http://erisalaw-chicago.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/1161224549.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=codon+worksheet+questions+answer+keyPDF 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_off0000e6a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A6 18036 bytes
SHA-256: 590e4629aa8045a97adc96fe50cf755c331466f6f360e6a4bf28fbf2b6450a10
font_01_sfnt_off000115b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115B7 10868 bytes
SHA-256: 050216056673322f029ef02d40fd6874094ef158b1b3336ec2f2f63a88341d03
font_02_sfnt_off00012eaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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