Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f5e22d39188fd26…

MALICIOUS

PDF

78.3 KB Created: 2021-08-16 21:52:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b81780c062f20afd36995f15cef86fe9 SHA-1: 292a47e2c44838067699c14951036f5274f82e52 SHA-256: 8f5e22d39188fd26f612381a6cda59f09a3fc0f651a6e3958e3a7b8ae534a404
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The primary function appears to be acting as a link farm to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://ambvetesopo.eu/userfiles/files/6033331580.pdf
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c90a40d0b12---jopoponisaretudoniluxokon.pdf
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/20ab366e6ca45f09f34d1aff93634eb9/68727826405.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/e3ac53407380b6be5bb3fadd59f6496d/tukugejixi.pdf
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba36de10360---29378679525.pdf
    • http://aire-limpio.com/img/editor/file/faxofagaxitekifegolaxika.pdf
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/mederajex.pdf
    • http://bananamusic.tw/uploads/files/202108142050049406.pdf
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0579ef3be0---67594329840.pdf
    • https://asthasupermarket.com/userfiles/file/mapibuvilupegelivuxogeneg.pdf
    • http://belloverde.net/emailer/file/xanagivotimepajopufivo.pdf
    • http://anhuicrew.com/upload_fck/file/2021-7-19/20210719123605728563.pdf
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/bddb2d7f492a5a9425ec09298754fd18/zipesoxazeronobipi.pdf
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6c05adbf48---84832977364.pdf
    • https://principesgs.com/userfiles/file/93906925862.pdf
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160eddf19408ff---51141985634.pdf
    • https://sportsht.com/userfiles/file/jovipifozaxasigazukalola.pdf
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aaef8d5d42---vivexuxevotomevap.pdf
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160809ac1aaac6---13701950553.pdf
    • https://moolans.com/uploads/files/zuxesapokipawi.pdf
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa6896925a4---lolekokelawewapomi.pdf
    • http://lhsclassof77.com/clients/34792/File/64493328905.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=alhaji+sikiru+ayinde+barrister+music+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_off0000c992.bin
eaf380e1e319fcb61fb0d566177069a9b84ad6269d95bb614189e388eaa12355
pdf-font-stream PDF embedded font (sfnt) at offset 0xC992 18244 bytes
font_01_sfnt_off0000f821.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF821 16792 bytes
font_02_sfnt_off00011038.bin
fe396a89e8784a79bd8b7614ca17a50ed81809e8018ea19360327b76e2af9ee8
pdf-font-stream PDF embedded font (sfnt) at offset 0x11038 11280 bytes