Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8a2a17c74d5241f…

MALICIOUS

PDF

83.3 KB Created: 2021-07-02 22:41:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1765464f4269620e7935eef8ae568cfd SHA-1: dd93e5d9fa17c297b1f407745cd9d2be3f04aa8b SHA-256: a8a2a17c74d5241f0259ecc883ac6d4a7ce7e3387e024526fe5149ff0cefe1ea
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple websites, many of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites for phishing or further exploitation. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160a2891679f83---6458128577.pdf
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/dc9825717d9dbc931247b796c1d657c2/32130416066.pdf
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a64d5775d62---17805565402.pdf
    • https://aquafilling.com/userfiles/file/wapemew.pdf
    • http://aarogyamedico.com/userfiles/file/naduvixusijegag.pdf
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/16084458e1082b---34536235346.pdf
    • http://salukool.ee/upload/userfiles/file/10343495926.pdf
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/7fc6f45c9bfde6db40d06a73b64f9889/lavuzosijutenu.pdf
    • http://ifa-astrologie.de/userfiles/file/rakiridoxuboriza.pdf
    • http://mulroyenvironmental.ie/userfiles/file/94675726961.pdf
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/f534c5558fbef1273eb9a87fc5fb97b2/wenovewip.pdf
    • http://aiswaryamatrimonials.com/fck_uploads/file/miganadazadixudaru.pdf
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f282daeae5---23713287547.pdf
    • http://fhhsclassof70.com/clients/4/42/42ce21dc30e429aa976ba070b22ccf93/File/53374341130.pdf
    • https://asset-books.com/userfiles/file/fikatuvexugupagibubabob.pdf
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097366edbe9d---xefimepoziwigutaza.pdf
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/6macos3k7esetgfsn9rh2vjr9u/54121445181.pdf
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160736fbbc9fea---latogumux.pdf
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc91c55fc9---41623149167.pdf
    • http://goldenpeak.it/userfiles/files/42420659175.pdf
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b0c557de645---nuwejabevenetin.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=god+of+poetry
    • 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_off0000e77c.bin
180220261aea21a60708119d75ae74f659be2fb4b90ed52d980fc4b2670b1fcb
pdf-font-stream PDF embedded font (sfnt) at offset 0xE77C 10072 bytes
font_01_sfnt_off0000fe0d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE0D 16792 bytes
font_02_sfnt_off0001161f.bin
76ba5c3b4169b5d66de23b742f83c5e76e965576e7eb39adec6d2b04fe853e12
pdf-font-stream PDF embedded font (sfnt) at offset 0x1161F 16592 bytes