Malicious PDF — malware analysis report

Static analysis result for SHA-256 39e4d875ab524d69…

MALICIOUS

PDF

91.7 KB Created: 2021-06-28 01:13:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 45cebf839ab3a466cca575fccc4e78f4 SHA-1: 7690af52c74dee998d8b905ca27f9fa0c2d5f398 SHA-256: 39e4d875ab524d693ad0dd43fd368cbebf1848cce4289801e1f6b57fdee80e1e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL analysis suggest a malicious link distribution pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1606f22b3e3201---rejosutapudupinesidikator.pdf In PDF document text
    • http://files.ibiza-ferien.de/file/ziwusimuwujebazaxet.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607671bcb38e4---19857405914.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/66f9o1hadheljemor97p4t320f/79273889056.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16094b8f9cab46---85031700449.pdfIn PDF document text
    • http://myflora888.com/ck_files/files/20240341251.pdfIn PDF document text
    • http://kompletucetnictvi.cz/files/file/kesuwizofugofijiguf.pdfIn PDF document text
    • https://likeevent.it/writable/public/userfiles/file/1360846714.pdfIn PDF document text
    • http://momsystem.ru/public/file/mujijelotabizibinegot.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/c5a9dd1cb3492bbdc6493ee7968297d0/32834450122.pdfIn PDF document text
    • http://kyanite.tv/userfiles/file/75148126753.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/935qkj6t617foh86tig8r7jkh2/somidagezudafupasirerinif.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/65703843975.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16096b042937de---nibowaxogofowefe.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1f2fbc2db0---36806675256.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160799b3d7c964---dibexonoluwanagimilajiw.pdfIn PDF document text
    • http://cukierniabrzezinski.pl/www/artizam/fck/file/juxumew.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160aaf0e40128f---39609572369.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/mnulcq3iaoktgs3f9lv53pgcb0/40348778624.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/8vjoqaeprbkbknbacd3vkatdgi/95573673694.pdfIn PDF document text
    • http://blbr365.com/userfiles/file/1621885046.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/48ntm734n7b4khbqaon6nkl235/datoziva.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca37a3325e---lulewopalumig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=planned+c+section+after+emergency+c+sectionPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ffdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFDB 19012 bytes
SHA-256: 0dc8b0be4bdcfe44a5fabe54265707baf1db6dc66c2ee4c152e7c468df10ba02
font_01_sfnt_off00013025.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13025 10936 bytes
SHA-256: 3290b057f6a1a020c61d6546d55af00c0377af156f7db81f5cfd9727e1aa8d1a
font_02_sfnt_off0001494a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1494A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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