Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf6ea04c89acdb98…

MALICIOUS

PDF

79.6 KB Created: 2021-09-23 05:07:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4e24b2c49c1c05b9a322a14647b52895 SHA-1: 3f7d94ade6b6eeaf2351e45eb4a28ff09d157fe4 SHA-256: cf6ea04c89acdb985d0b00b12b9a9be36287e185a1a8fc1392464c79cea759a4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains a large number of external URIs, many of which point to compromised WordPress upload storage or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 https://pixomot.ru/uplcv?utm_term=signed+apk+not+installing+on+android+phone
    • https://towa-aaa.jp/userfiles/file/21574677553.pdf
    • https://sofupingame.com/calisma2/files/uploads/jisiwijegoguxewuviwuwin.pdf
    • http://murielbellhomes.com/userfiles/files/mural.pdf
    • http://zgic.ru/!upload/files/dimagafoji.pdf
    • http://caffepontoni.com/uploads/file/50839129270.pdf
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/48e7ba3b19e16d40e620fcd8a4635530/tanavemijusemalivudufuge.pdf
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613f6d7c40370---fakojira.pdf
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133d6a7254a8---20341060617.pdf
    • https://srmhomes.com/images/bulk_images/files/vagemuvapeker.pdf
    • http://atomicattack.com/atomic/fckimages/file/74197654037.pdf
    • http://www.firengo.com/userfiles/files/tunebetipipewiwofalo.pdf
    • https://micsys.in/userfiles/file/94962709295.pdf
    • http://polaryachts.com/res/wysiwyg/file/zovakobinedilok.pdf
    • http://bsa-billiard.by/images_from_html_editor/file/59422421366.pdf
    • https://acp-luxusingatlanok.hu/ckfinder/userfiles/files/gofaxu.pdf
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/5c21c02702942599daa5d118a8a55548/farorakivozegepez.pdf
    • http://chiari-web.com/ckfinder/optimist/files/38214864934.pdf
    • http://engineersclasses4competition.com/files/others/mepodeze.pdf
    • http://gokea.org/upload/editor/files/12795470477.pdf
    • http://vipnjl.com/userfiles/files/22565371601.pdf
    • http://edisonprivateschoolbeta.com/cote_dor_import/admin/ckfinder/userfiles/files/16419601866.pdf
    • http://buydecor.ru/uploads/files/kuwemadazije.pdf
    • https://jakspravnenapsa.cz/userfiles/file/nunimumiwilubawilefakel.pdf
    • https://abyway.lv/images/ck_images/files/95135540557.pdf
    • http://ottomaniantextile.com/userfiles/file/87920802271.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_off0000d539.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD539 16792 bytes
font_01_sfnt_off0000ed50.bin
a223ae398ddf8782b8290c1dfc1509f2b3d17602012be9a37d6fb288cd7e1572
pdf-font-stream PDF embedded font (sfnt) at offset 0xED50 10836 bytes
font_02_sfnt_off000105fe.bin
9bd7fdf2b2322d176a1f6d4ef218be4aedb1a440727b8a9084882e8c0ee75587
pdf-font-stream PDF embedded font (sfnt) at offset 0x105FE 16516 bytes