Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f0882b8d895e1c6…

MALICIOUS

PDF

92.4 KB Created: 2021-09-16 16:43:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b764a6fbc559862dcd587b05a564609b SHA-1: 0b54c4a8d9449fdaed922b5d28ff5a1f4f43e12f SHA-256: 3f0882b8d895e1c69c12d97fabd1e492dce3e26736f67385e10c7f7f71dcc103
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as a phishing trojan and the ML classifier indicated a high probability of maliciousness. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the nature of the links and the PDF structure strongly suggest an attempt to deliver a malicious payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9558

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 https://immsac.pe/sgi_userfiles/userfiles/files/zukolidajesuzuvujadopimo.pdf In PDF document text
    • https://likeevent.it/writable/public/userfiles/file/jezorokalej.pdfIn PDF document text
    • http://xhzhengli.com/upload/kajefulanawu.pdfIn PDF document text
    • http://sino-web.net/filespath/files/20210909113219.pdfIn PDF document text
    • http://xmzhj.com/UserFiles/file/85035002881.pdfIn PDF document text
    • https://spitalmoldovanoua.ro/ckfinder/userfiles/files/tojufuperadasa.pdfIn PDF document text
    • https://wwa.bdbabymart.com/app/webroot/ckfinder/userfiles/files/voketurile.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1613edc1877d45---72953479442.pdfIn PDF document text
    • https://astdubai.co/userfiles/files/98314412866.pdfIn PDF document text
    • http://foto-recepty.sk/images/fotky/nozilolojobadoriw.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/eceac68c545c51c8e284ef4606b323fb/fuwogomafoj.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/3dbac6a5ed7b0e26e19b2a1b6a4049ac/juvekosuw.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/vedixabe.pdfIn PDF document text
    • http://frankifoto.com/uploads/pages/files/kixigimoxamu.pdfIn PDF document text
    • https://fminterativa.net/cms/plugins/ckfinder/userfiles/files/43931474264.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16141c4f72604f---24248340258.pdfIn PDF document text
    • http://newdimension.su/userfiles/file/97985024893.pdfIn PDF document text
    • http://hoanhaochemical.com/uploads/files/36856052421.pdfIn PDF document text
    • http://boldogelet.hu/media/32940885082.pdfIn PDF document text
    • https://anzhero-sudzhensk.verlauf-ekb.ru/admin/ckfinder/userfiles/files/67280529849.pdfIn PDF document text
    • http://hattingtoemrerogsnedker.dk/userfiles/file/toturenoduner.pdfIn PDF document text
    • http://bloodfaces.de/attachment/file/5527487943.pdfIn PDF document text
    • http://usarsenal.it/userfiles/files/tezofejonasujuna.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161329a833c26d---69784949815.pdfIn PDF document text
    • http://herborgthailand.com/file_media/file_image/file/vawepiwapaj.pdfIn PDF document text
    • https://angel-juicer.com/FileData/ckfinder/files/20210912_0EB08A8CB069AC95.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=modern+combat+4+apk+2019PDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD9E 11136 bytes
SHA-256: 8ac08cb0f5c33698fc7f4250ce6747468b6308cb33fc2902e642f89dad31f2ca
font_01_sfnt_off0000e77a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE77A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF8B 17212 bytes
SHA-256: b9cdf3ffb37792bff4e9597177f129658171a88e4c955d268de269e15418d574
font_03_sfnt_off0001193e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1193E 24596 bytes
SHA-256: 7d78a8f1814a55108658d89986556e8fd791faa97016e395db880ee0455069a9
font_04_sfnt_off0001587e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1587E 1936 bytes
SHA-256: 9aeb06937c81a5c56cf99af8deab830259c8e7bb488e779e8e638c33337cf583

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