Malicious PDF — malware analysis report

Static analysis result for SHA-256 a68deec0ba851e0b…

MALICIOUS

PDF

81.8 KB Created: 2021-07-01 16:51:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7ff8c73545db3c281272b63f27476847 SHA-1: 55ec9302cd114ef759db16a4795a6687740cefba SHA-256: a68deec0ba851e0b14053f6bfb5e35bfdd4fef022853997a3e3afab44f936360
164 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to potentially compromised WordPress sites, acting as a link farm to host malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/16071d9a130025---domopesimajuzekofatoz.pdf
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/6diahenr179n6q9mfq53pbti3u/72106422709.pdf
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bba51c64a61---gixewemigufapomokifawi.pdf
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b975073f6---zulomavudonadenirow.pdf
    • http://atomleasing.ru/media/File/winigosoxazafinifit.pdf
    • https://loctra.net/userfiles/file/kanav.pdf
    • https://condominiovillage.com/userfiles/file/38312322319.pdf
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/56284790836.pdf
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/71908967ce47c8170751db0fafecd0a5/fipufi.pdf
    • https://blogsma.com/files/kutewubodasikeg.pdf
    • http://skikk.nl/app/webroot/files/userfiles/files/noxavopomorunededarum.pdf
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/52d3769cb3a193a4254cb362fee00f5a/54626715134.pdf
    • http://inventory-acepipe.com/images/uploads/files/gapovofawebazasel.pdf
    • http://ekotop.eu/userfiles/file/14983799440.pdf
    • http://kemmurad.com/webroot/img/files/raxijase.pdf
    • http://n2nlah.org/UserFiles/file/88550054930.pdf
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160987f4fec5a8---1104109094.pdf
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/3f425c193839a7fa7b167869c954c7d4/33777273714.pdf
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089c35bc06b3---xazoxawu.pdf
    • https://deniz-sogutma.org/img/userfiles/file/lovomefaguzakukafozugagul.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a846e3753ed---xuvigo.pdf
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/047175414a1a04f07d2fc47faa8d6ef4/gezisotuxigomulilono.pdf
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a84048417---xezages.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=7th+standard+science+answer+key
    • 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_off0000de54.bin
b9469e59d92032bf4366eb94c553c665878e035c261c254baefd22c1750a5341
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE54 10548 bytes
font_01_sfnt_off0000f66d.bin
a59e32325ea0cec6fe06fcb89f56229d7c7da46f4de5cb4f8333ef1697da74eb
pdf-font-stream PDF embedded font (sfnt) at offset 0xF66D 16880 bytes
font_02_sfnt_off00012211.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12211 16792 bytes