Malicious PDF — malware analysis report

Static analysis result for SHA-256 c38a78b39c6c5544…

MALICIOUS

PDF

87.5 KB Created: 2021-06-29 10:03:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ab7777f3cc6b0d64e7764b87bee72a6b SHA-1: d7b0421703cc16e9c6809ef27e9efad1c2c155bb SHA-256: c38a78b39c6c55449847eb2a0ce0d34b7bdc0361ab44fd83bcce9adef474ab9c
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics indicate the file's primary purpose is to redirect users to malicious external sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://allytemp.ru/uplcv?utm_term=most+common+numbers+set+for+life
    • https://acryl-bg.com/userfiles/file/gaxupibugiwojaxubafuka.pdf
    • http://designpavelzapletal.cz/files/file/81828123262.pdf
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a6a8ad7118f---gajamok.pdf
    • http://attep.com/home/sandbox/domains/heekee.com.hk/public_html/ckfinder/userfiles/files/zeniwob.pdf
    • https://szaniterplaza.hu/ckfinder/userfiles/files/kukusagagerodudote.pdf
    • http://cityhelps.org/clients/6/61/61afa7a028a8e04f14432b0fece6f2b0/File/44440456255.pdf
    • http://anhbanglaw.com/userfiles/file/89323990980.pdf
    • https://gencerenerji.com/resimler/files/sadig.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/ca828665f3183d9fab241c0c751d0f70/67000613286.pdf
    • http://kameleonhastanc.hu/files/file/divixoxasubob.pdf
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aebca5ce572---selusomuraxupimafav.pdf
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/a20b9e6e5f55545af440d4bec3ccfe20/76231223234.pdf
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070c83cbe5c4---70484570918.pdf
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b896c66c0e0---fovubojewamijinis.pdf
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/2vqdopaah0a9hd97tfkaqctc1t/72646589892.pdf
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/783951591088790796706324e5f73c79/lateludaxorajetasi.pdf
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/0kio75nbmb7u47jp6a0rj1vgk5/51715755661.pdf
    • https://allmassage.net/upload/file/20210506231227.pdf
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16076092bbda1a---wurekokujogejomajaw.pdf
    • http://gourmethousemacau.com/UploadFilesfile///zurijomujarax.pdf
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1607cca2b03c1a---komosuvusemovogi.pdf
    • http://matsonconstruction.net/userfiles/file/6332595579.pdf
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/9t1b2o75rq3q3efjdnl2i5m1he/86618892119.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_off0000f3b2.bin
ac0af3d5904bae71b99cdafae1a265fd2ab804bde2917f5251eecfb03911698d
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B2 10568 bytes
font_01_sfnt_off00010bca.bin
f07202a4a6950fc1f784a6a702e727e08ae3794e7929b2bd70ea2e308de5c21c
pdf-font-stream PDF embedded font (sfnt) at offset 0x10BCA 17152 bytes
font_02_sfnt_off000138c5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x138C5 16792 bytes