Malicious PDF — malware analysis report

Static analysis result for SHA-256 63e539f440a60b03…

MALICIOUS

PDF

93.5 KB Created: 2021-07-07 09:08:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 35a244691e7607717e16c3c3e07fcd71 SHA-1: fcb7971dea7f2e64e13eb0556de048f7779dd706 SHA-256: 63e539f440a60b0363fc74a122715bc6af2a027ac19c624934977a7c02d4f91d
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress installations and disposable hosting, suggesting an attempt to distribute malicious content or conduct phishing. The presence of embedded URLs and the nature of the heuristics indicate a likely spearphishing attachment used to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://irlanc.ru/uplcv?utm_term=magical+minecraft+texture+pack
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7cde2214d---fidotatizoxujuzulilesedo.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080460487a0a---fesilogawenaloxe.pdf
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099cbb3683df---27287528730.pdf
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/a71f4e8c299242ee842b717652cff890/7962286298.pdf
    • http://studioriggio.it/userfiles/files/puzosorosokazapexorixopa.pdf
    • http://spearsyounglegacy.com/clients/b/b2/b2c23f164518415ec8f3c1c8d0af542d/File/lelilafezexapa.pdf
    • http://trustycctv.com/ckfinder/userfiles/files/jazelirurivifafolufawi.pdf
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/398021d664481ede13187e390506fcb7/73107684267.pdf
    • http://lucidarepavimentimarmogenovaealessandria.it/userfiles/files/43602373190.pdf
    • http://www.flamanville-76.fr/upload/file/jofiv.pdf
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9fceae7dd---3193842668.pdf
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8998a0b10a---wawinabinuf.pdf
    • https://asthasupermarket.com/userfiles/file/63190829644.pdf
    • https://sport-jicin.cz/dokumenty/gezufazixomupikifup.pdf
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/6nom5vlp76jdb3mdhtqkkdi1en/60877141768.pdf
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/65210703289.pdf
    • http://ferramentabelleggia.it/public/file/semuvesulukulajomixajur.pdf
    • https://asthasupermarket.com/userfiles/file/17294643141.pdf
    • http://xboxheerlen.nl/userfiles/file/33067595084.pdf
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/eee8cfd6358572715e06aded5ea9d94d/maxakavafemerasometisan.pdf
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/98d38fb3ea983ef1e13147a815664fe0/vijilomafememizexefonuvos.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f360.bin
128991f5c1439f1e60f0d9765295b5ad66d1b063a9a2765b31b3552cb36eea64
pdf-font-stream PDF embedded font (sfnt) at offset 0xF360 16460 bytes
font_01_sfnt_off000109ab.bin
f97eec76c1a9e13791f1cf55cbe1856cf1a3d3c760915fe0b3d6b4add5a5915b
pdf-font-stream PDF embedded font (sfnt) at offset 0x109AB 17436 bytes
font_02_sfnt_off00013725.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13725 16792 bytes
font_03_sfnt_off00014f3c.bin
5c8ccaeeda114defd9329061d366325b96a427b198587638eda4d0ac56443756
pdf-font-stream PDF embedded font (sfnt) at offset 0x14F3C 10824 bytes