Malicious PDF — malware analysis report

Static analysis result for SHA-256 d61c454287a63d7d…

MALICIOUS

PDF

84.6 KB Created: 2021-08-02 11:56:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: a4a442cef44b980e4b37ea1942242779 SHA-1: 5f6af7dc642cba1323b1fbdbc25ce920c2df4ae9 SHA-256: d61c454287a63d7d94f7fc662c2ab579d7c4c65a31e67fd3dca64a3ce67b986c
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 compromised websites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The file's structure and numerous external links are consistent with a lure to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://lavineriablend.it/file/20511212365.pdf In PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/e89f077e17014434c36627c8ff6248fc/84489136131.pdfIn PDF document text
    • http://pelesiuvalymas.lt/i/File/4320626791.pdfIn PDF document text
    • http://harchovyk.com/userfiles/file/4250264731.pdfIn PDF document text
    • http://appli-veolia.net/ckfinder/userfiles/files/59505197512.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/499ee7b1b8972c7e6aece88477630942/dodozodurulafufevet.pdfIn PDF document text
    • http://drxzhang.com/userfiles/file/xidikawokaselun.pdfIn PDF document text
    • https://genia-groupe.fr/images/files/xugamanezetusupo.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f8501b4c6f---soritorurivurasar.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160afa56ac9824---85435660433.pdfIn PDF document text
    • http://retroldn.com/userfiles/file/favikatizawa.pdfIn PDF document text
    • http://daiichigroup.net/uploads/news_file/13252811817.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/8a6j1ps3qfj2kfem3o9d02t97c/80621985906.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084a5355102c---nulewewapozexofef.pdfIn PDF document text
    • http://zoltysnieg.pl/pliki_wyswig/files/90056138580.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/6n9p0r50kk6j171shjjdb5ef6b/modemojipodewos.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/25264146380.pdfIn PDF document text
    • http://unsersohn.ch/images/file/lerelozetokesomura.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/65900647067.pdfIn PDF document text
    • https://n-vv.dk/userfiles/file/3840196213.pdfIn PDF document text
    • http://reklamavysocina.cz/UserFiles/File/mafakuv.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610007953e94f---31435719027.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/e4f4001e3c61df14e583ae2b59f498f1/rugukuvixu.pdfIn PDF document text
    • http://dorisemitchell.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tedef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=don+quijote+dela+mancha+pdf+instituto+cervantesPDF 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_off0000ddf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF6 19348 bytes
SHA-256: ae9db90a6305f53aa828c51289450cd5a534ddc65b735fc8a9bd096a8e361e4e
font_01_sfnt_off00010f8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000127a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127A3 11328 bytes
SHA-256: 166ef443c956d04fa5e4c6686cd578e2d355611d5ff78dc7b154e1bdc7d80a48