Malicious PDF — malware analysis report

Static analysis result for SHA-256 809e1253e0ef51b7…

MALICIOUS

PDF

82.3 KB Created: 2021-09-23 00:54:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c17ef8b5fef132b6e151978904cca098 SHA-1: e8ed56122f52985076579c82cf6a581585025f32 SHA-256: 809e1253e0ef51b7625e8e54c3f9566ecf712718589808b44f5cc2de540381e1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm designed to redirect users to various external sites, disguised as game download links. Several heuristics indicate this is a link farm on potentially compromised or disposable hosting, and the ML classifier strongly flags it as malicious. ClamAV also identifies it as Pdf.Phishing.Trojan. The presence of embedded URLs and the nature of the link farm suggest an attempt to deliver a malicious payload or phish for information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://pixomot.ru/uplcv?utm_term=tekken+3+old+version+game+download
    • http://www.ciesol.es/ckfinder/userfiles/files/70480688381.pdf
    • http://daindnc.com/fckeditor/userfiles/file/53941271549.pdf
    • http://immobilieninvestors.com/userfiles/file/vuxoxojaraj.pdf
    • http://abwingstop.com/uploads/files/48142257013.pdf
    • http://www.tsahimmongol.com/uploads/images/files/90434016740.pdf
    • http://garantc.ru/userfiles/file/zufupegunugegubeginupew.pdf
    • http://texinpack.com/uploadfile/file///2021090914442623.pdf
    • http://addisonplaza.abwingsmd.com/uploads/files/gogunubamuma.pdf
    • https://lifeteacher.tw/uploads/files/202109110043026783.pdf
    • https://justforjetscatering.com/userfiles/image/files/lazedo.pdf
    • http://studioaeditecne.it/userfiles/file/33705287947.pdf
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/dubinosaxege.pdf
    • https://www.stock2morrow.com/ckfinder/userfiles/files/82262175430.pdf
    • http://vo23.ru/upload/file/38571523901.pdf
    • https://trieurodata.ro/images/file/89406516393.pdf
    • http://lamgi.pl/ckfinder/userfiles/files/sovipibunaniguba.pdf
    • https://taksis.lv/taksis/userfiles/file/lawelokilepadanogameri.pdf
    • http://hasdeu.md/data/userfiles/files/8923908315.pdf
    • http://aibasylhet.edu.bd/app/webroot/ckfinder/userfiles/files/56548505310.pdf
    • http://thekitchendesignstudio.org/uploads/files/38255543811.pdf
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613c5bcd239cc---56953374588.pdf
    • https://www.grdr.org/paidel/ckfinder/userfiles/files/26997100684.pdf
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/42569d50f6e7fabef8eaf680f8fa9a55/bakite.pdf
    • https://kcharp.com/ckfinder/userfiles/files/rifefitewedujarogusabaj.pdf
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16147827815905---18467816141.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_off0000dbba.bin
361681233850d9d04a8f35d996d7a60031a4640ffc80c0cc4be36e6d5d2e585c
pdf-font-stream PDF embedded font (sfnt) at offset 0xDBBA 17748 bytes
font_01_sfnt_off00010a13.bin
7548b27aaa927510ff4ad6da3249ebf10c59d53e2d0dea82a7e0cea6cb9586b1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A13 10872 bytes
font_02_sfnt_off00012316.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12316 16792 bytes