Malicious PDF — malware analysis report

Static analysis result for SHA-256 c637b63d4d48f9e1…

MALICIOUS

PDF

76.1 KB Created: 2021-09-05 15:26:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: aff05472fd7d4588539a0932693b50ba SHA-1: ee3095472ac88e560152fb3d44733771641ff382 SHA-256: c637b63d4d48f9e108670d069b169248756cabd9d75bc86138cec25ca2790bcd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It functions as a link farm, containing numerous URLs that point to compromised CMS uploads and disposable hosting, likely to redirect users to malicious sites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics strongly suggests this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://condominiovillage.com/userfiles/file/44684153379.pdf
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d88ce57fc3---6634487964.pdf
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c718596a79b---17823016059.pdf
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/18cff117eea0e1fb33f05f8abcf1cde7/gosaweridir.pdf
    • http://aifamilyreunion.com/clients/59202/File/gefolozomikoduzovelako.pdf
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094c619a3fd7---kapum.pdf
    • https://tungqibiotech.com/upfiles/editor/files/66755116305.pdf
    • http://china-engine.net/ckfinder/userfiles/files/46100470934.pdf
    • http://blpest.com/UserFiles/file/zovar.pdf
    • http://globalcenterhotels.com/bot/ckfinder/uf/files/70567762849.pdf
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/739ddcf64d8d8b21d303a77e1aca7e0e/nepefopudamigakiranaku.pdf
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/pke9noqos46bqcjo4q0v2m6gor/kafutalobexulovagasaku.pdf
    • https://bokaichenyu.com/upload/files/25912923624.pdf
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/19fa46c4dcac6e49f98550713e8966c7/78010911299.pdf
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/67re02nrubkub8d93ve1g0p7ph/74147039515.pdf
    • http://circuitvietnamcambodge.com/hinhanh/file/fititufitixitu.pdf
    • http://americandeliorder.com/uploads/files/pevofikubapivow.pdf
    • http://ibtaker.ps/userfiles/file/gujokenutipuxarafa.pdf
    • https://binhvi.com/upload/files/lebibexane.pdf
    • http://xboxheerlen.nl/userfiles/file/wonuvitijukavatufaj.pdf
    • http://shinies.ru/img/lib/file/74599589074.pdf
    • http://gilendor.cz/userfiles/file/26571113337.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=std+12+english+paper+2019+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c39c.bin
8a63c331c55c1d64e040ab3910feb33b213ef6555851e7f97ec800814d8b9bf3
pdf-font-stream PDF embedded font (sfnt) at offset 0xC39C 11196 bytes
font_01_sfnt_off0000dd98.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD98 16792 bytes
font_02_sfnt_off0000f5aa.bin
c80df2040dd0675914dbe52c477e305153e0a7e172e29d26a8978ad8bee8d417
pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AA 17856 bytes