Malicious PDF — malware analysis report

Static analysis result for SHA-256 52851693e9917f2f…

MALICIOUS

PDF

69.7 KB Created: 2021-06-25 15:32:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f78eec0f07d85810f6e8aba14f6f3c29 SHA-1: b6185879973fd7739fe13bbc53e394f3c4711b24 SHA-256: 52851693e9917f2fcf55a61301df7fe43de89f9dcbe6f8a8f707213752958a86
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as a phishing trojan and a machine learning model assigned a high probability of maliciousness. It contains numerous links, many pointing to compromised CMS upload directories, suggesting it functions as a link farm to distribute further malicious content. The document body is unreadable, but the heuristics indicate a malicious intent to redirect users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • 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.
  • 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://healthywithhart.com/res/file/99023644952.pdf
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160d463467cb3d---vagaduwu.pdf
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/9qklgfk2vs69vjt83tc5jt8kpk/64325488052.pdf
    • http://hagelkonzept.de/userfiles/file/48756674528.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/11f9764822579362cc23c9ee7dae8450/zabebajun.pdf
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/kkub0brfmrgmg4jgvucgmdsm7k/jinisunofeworen.pdf
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/2a384a052671f95d1d2c803bdd92be90/tisokosir.pdf
    • http://brmxn.com/userfiles/file/20210517212720_v3ttzn.pdf
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/8239c3015eb76a1695c5e78190bacfb3/33250333069.pdf
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/apbgnn0son0bo27j4tqlr33arp/duweg.pdf
    • http://www.greenbriarpropmgmt.com/wp-content/plugins/super-forms/uploads/php/files/4e0fa29e267fec5db4598bafd58b1f5d/47070167423.pdf
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/d8bfaf1840b4fdea3a1d4a779bd133f1/gekebidamulemirufepa.pdf
    • https://bancodevida.com/bancodevida/admin/images/image/file/6545207659.pdf
    • http://tikatalog.sk/_files/file/nudubigonojakejuv.pdf
    • https://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/4f73e90e8f67cb15d27a186747e1c5c7/tovotepesupepevawijekazup.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=hill+climb+racing+2+unlimited+coins+and+gems+hack+download
    • 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_off0000af8b.bin
93670b64660c4a66ebc9e073b537603fa2523fbe4673168eaacc410e77a17df0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAF8B 11348 bytes
font_01_sfnt_off0000c9f0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC9F0 16792 bytes
font_02_sfnt_off0000e202.bin
974fb33660ce80fa1f41e8ce3c1f9dc5446ec8322e95ac62e67bbdc0f33c8231		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE202 15624 bytes

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