Malicious PDF — malware analysis report

Static analysis result for SHA-256 b95748ae4c73d74d…

MALICIOUS

PDF

82.0 KB Created: 2021-10-09 13:50:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9560cfe11c0c44a0a10e5ae7b983b3b0 SHA-1: b9fb1837cf26d0e585a9ac7e26af7c8bae6dc445 SHA-256: b95748ae4c73d74d3c8fb70278d8495ecbf65b165fff6fc30ac08b093329859c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with multiple URLs pointing to compromised CMS upload storage and disposable hosting. These links likely serve as lures to phishing or malware distribution sites, consistent with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://ketchas.ru/uplcv?utm_term=swot+analysis+service+company+example
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16141f3c45f23f---76010136639.pdf
    • http://www.accl-calibration.com/login/ckfinder/userfiles/files/dugixosife.pdf
    • http://wagnerpc.com/userfiles/files/33676629204.pdf
    • http://polishingmarblefloor.it/userfiles/files/2211099130.pdf
    • http://fine-cottage.ru/userfiles/file/fukajuwabujozidimukoko.pdf
    • https://qud27rxl1-k61l.com/contents/files/50496969225.pdf
    • http://karthikeyanjayaram.com/userfiles/file/75690135338.pdf
    • http://strap.sk/uploads/file/90279321220.pdf
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/161423982c0f6d---votunewadabakemojanuw.pdf
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149398377162---41918220719.pdf
    • http://nyitotthaz.hu/userfiles/files/valifosokumuwuwesosoxilu.pdf
    • http://nage-z.com/ckfinder/userfiles/files/vapupipexotowuwumoli.pdf
    • http://life-homeshop.com/asset/uploads/files/puviwejijevonodelebomid.pdf
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/195d2a3ed64c9ea7fd7ab4bf8f1d2641/66666796127.pdf
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613d56261d619---sotek.pdf
    • https://holocaustresearch.pl/nowy/photo/file/98999449397.pdf
    • https://luyenthitoeic.info/userfiles/file/jezakef.pdf
    • https://kudamatsu.org/userfiles/file/80885416942.pdf
    • http://clinicaveterinariagussago.com/userfiles/files/kixepizaruzesaxuro.pdf
    • http://chothuexehochiminh.com/userfiles/file/wamolasid.pdf
    • http://rapabzenec.cz/obrazky/files/gafewuvas.pdf
    • https://embassyinvietnam.com/webroot/img/files/dobaguxeluj.pdf
    • http://www.cottagegrad.ru/files/file/10889001678.pdf
    • http://go-pxl.com/uploads/files/89271918804.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_off0000d928.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD928 16792 bytes
font_01_sfnt_off0000f13f.bin
2278df9f4beeab27f7ae7d1fb5670aad6cda3b63caabe1a8a9861d5dbdb78c1e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF13F 10976 bytes
font_02_sfnt_off00010aca.bin
f82fee4c433117b168e8e6bd90876cf01c3b5694ba7cb041598c4dd26eaa5d39		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10ACA 18508 bytes

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