Malicious PDF — malware analysis report

Static analysis result for SHA-256 404a949fd78d040c…

MALICIOUS

PDF

117.1 KB Created: 2021-08-23 16:50:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cb19c7c89a6124a25dd91807a5814570 SHA-1: 3d0fcdfc9c2134d3fc3a3ac9b54993f0a857400c SHA-256: 404a949fd78d040c08be84cf8b60424938ef403653343526667b5e52a0ceae21
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://nomylo.ru/uplcv?utm_term=2nd+degree+price+discrimination+examples
    • http://aczelzalog.hu/tmp/57630294358.pdf
    • https://hansenlight.com/UploadFile/files/tunokoxijivotujufuzev.pdf
    • http://aiswaryamatrimonials.com/fck_uploads/file/fimegok.pdf
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/16099e89e35194---paminanevojivibakesu.pdf
    • http://djapm.com/userfiles/file/77895161723.pdf
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/j55q4ib4lflmgaoi1v4sep1cn0/deturofudadekewiwugez.pdf
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608181a12349d---suwamaxuvebakewumeve.pdf
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608fc82a1c625---89694486519.pdf
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc9f842853---wetip.pdf
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608c8d9819954---gizomuzuratelabem.pdf
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16070d74c9c587---52002463573.pdf
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/25c48854a8d4ff980e82f9597c6a8aa0/68214265045.pdf
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/q45m3er4ofpkvt540mkh3ctpv5/zages.pdf
    • http://lezeckastenakosice.sk/upload/files/solenukodurofudugaf.pdf
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609ca33674c24---taxaxizijamosiwudodam.pdf
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3d29e0e4ec---xexaxusuvibezefiruki.pdf
    • http://urjabatteries.in/userfiles/file/32130874085.pdf
    • http://galettedesrois.hu/userfiles/file/36792630614.pdf
    • http://zonwering-belgie.com/ckfinder/userfiles/files/99425449198.pdf
    • http://mingzhicc.com/userfiles/files/44301096531.pdf
    • http://kayapaliinsaat.net/file/xazosexibaw.pdf
    • http://riverside-plaza.com/upload/userfile/files/10389206766.pdf
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/d357fb06cb225a5e6e4912d17a0abea9/bifudefoton.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_off0001634f.bin
792d9dafb32d5360de50aa839da0feeb431f8bda66bc22a8d8a120b378506d88
pdf-font-stream PDF embedded font (sfnt) at offset 0x1634F 18548 bytes
font_01_sfnt_off000194ca.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x194CA 16792 bytes
font_02_sfnt_off0001ace1.bin
22d84bbeb7ca67eb8a6e79090dc2c9bf93431289d6a0b077ba9f1db0ce9cc3e4
pdf-font-stream PDF embedded font (sfnt) at offset 0x1ACE1 10984 bytes