Malicious PDF — malware analysis report

Static analysis result for SHA-256 035d9b36d985ea2a…

MALICIOUS

PDF

74.5 KB Created: 2021-09-01 03:16:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f8949d365df6b43a39ffc9c6e838d667 SHA-1: 8b10ac31244bbb22049368162432546edc29aa30 SHA-256: 035d9b36d985ea2a97f6b05ed28bf297883e106eefbb2f9f6b728c25538286a1
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting. The document body is heavily obfuscated, preventing analysis of its specific content, but the presence of numerous external links suggests an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://esebtekstil.com/resimler/files/gemepevuledijejadexaram.pdf In PDF document text
    • http://castrolmintabolt.hu/images/upload/file/gijoke.pdfIn PDF document text
    • http://anhopphat.com/uploads/files/46754405390.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/je1lgkki743rglav3ce5pfnkd2/jupesaduzixivabewagovawab.pdfIn PDF document text
    • https://chrmglobal.com/userfiles/file/56957937299.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/temojiredilifudopimeza.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/gazezofujik.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1607b265ce3908---15885870198.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/gikunulozilarif.pdfIn PDF document text
    • https://imotrading.com/images/userfiles/ruvojino.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160f5c308a2ca3---10047637044.pdfIn PDF document text
    • http://mtlebanon62.com/clients/5/5e/5ee551a8be14a26d7d76bc5e90dd1372/File/zitirofosagixe.pdfIn PDF document text
    • https://candbco.com/ckfinder/userfiles/files/42217935922.pdfIn PDF document text
    • https://www.alapan.org/fckimages/file/72895407127.pdfIn PDF document text
    • http://gsxr.hu/userfiles/file/13741368824.pdfIn PDF document text
    • https://argentinaproduct.com/ckfinder/userfiles/files/86899422614.pdfIn PDF document text
    • http://omni-links.com/images/blog//file/nagikapubokazawuzid.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cec705d8627---mutelepimazapojosa.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc9478f544---70974654966.pdfIn PDF document text
    • http://www.aluvascientific.com/UserFiles/file/mosexifopenuf.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/855ad10ce12d45453880128aaaf736ca/tatelenibinid.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8585032992---65907129193.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=mg+cars+are+made+inPDF 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_off0000c24d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC24D 16520 bytes
SHA-256: 98acf4dfc44b31d7c0b39780691c2268e6d72f9fcbf716717978b7d3664887a0
font_01_sfnt_off0000ecd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000104ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104EA 10440 bytes
SHA-256: 2d3b2e1ef7b7fbf05e53d6b1484ef4c2c4d783afe4867221412d7fe341117ad7

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