Malicious PDF — malware analysis report

Static analysis result for SHA-256 e56e1fffbb689ae4…

MALICIOUS

PDF

89.3 KB Created: 2021-09-14 04:27:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 24cb8f08c8242cb6122394c67383fd36 SHA-1: 71382b092ba2482c3fc7ccad5862e9354d9c9465 SHA-256: e56e1fffbb689ae41746a35872985a0caacfe58a41ecd978529b57a0fd9738a8
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL analysis and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://manenshop.com/upload/files/16657276198.pdf
    • http://alsace.annuaire-regional.com/ckfinder/userfiles/files/54194682316.pdf
    • https://creativitagh.com/pevron/www/img/file/peluradomatawaxukiguxun.pdf
    • https://poganyvolgyi.hu/userfiles/file/pagizakoloxadosobagipuz.pdf
    • http://hoteldazegliotorino.com/userfiles/files/xagewevoxedatekisudofuf.pdf
    • https://appvid.eus/userfiles/files/14463996253.pdf
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff7bd5fa5a---bemagutuda.pdf
    • http://kleinschaden.expert/userfiles/file/pameruzuzogef.pdf
    • https://casaalu.com/luutru/files/rukir.pdf
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/l8v7qll92ucrk9iqm5vl22ksuj/41639203210.pdf
    • http://haohanlegend.com/Uploadfiles/files/bumusajotek.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613fcc94a8c3c---67186677272.pdf
    • http://amindoost.ir/images/upload/files/molagivep.pdf
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612ede604ee38---90960306546.pdf
    • http://wedooverseas.com/userfiles/file/vilaxagefiwukopejem.pdf
    • https://capecoralliving.com/media/file/vufokowokaw.pdf
    • https://defi128.com/userfiles/files/55825468687.pdf
    • http://sino-web.net/filespath/files/20210905211322.pdf
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/29698518e749e0cd4595f54798bb31a2/gumunawelagepowikuxosote.pdf
    • https://avistravel.activsport.ro/userfiles/file/kitaminosusenazinabafeb.pdf
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/8a3f8be77dc07d29b98a554f02ba7ed4/81105289681.pdf
    • http://ukrfirework.com/images/file/ligigaje.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=grand+theft+auto+iii+release+date
    • 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_off0000f7d8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D8 16792 bytes
font_01_sfnt_off00010fef.bin
a065f19d3d93671cc083e64fadc9d59154427d6b2ca40bb385d4d924e5661760
pdf-font-stream PDF embedded font (sfnt) at offset 0x10FEF 10592 bytes
font_02_sfnt_off00012809.bin
1a3b8d87477b711fb34d6306586bdd548a6660447b4755efc177d210391c6fea
pdf-font-stream PDF embedded font (sfnt) at offset 0x12809 18160 bytes