Malicious PDF — malware analysis report

Static analysis result for SHA-256 3764ff2031d1494f…

MALICIOUS

PDF

74.3 KB Created: 2021-09-04 02:55:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a1a5b41947a02603a2c6ec31195ac044 SHA-1: bd45da711e683cf4d2da4a21a43d79f94fae497b SHA-256: 3764ff2031d1494fec15dd2eb68419c6d24edb88e2127537b944df8adc71d1cb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple distinct hosts, many of which are hosted on compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/3ea4314173b4af4f3bdbf0415297cd67/zuwegaxiwumuvabopilof.pdf In PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/08231ddae3b2f1423baa53810a660d09/87495135735.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bcd0e464750---tulasigukutin.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/ade51e1805c3febcd56ceaa3bcf91131/28776561613.pdfIn PDF document text
    • https://embassyinvietnam.com/webroot/img/files/gibibumen.pdfIn PDF document text
    • http://archerelectricsupply.com/userfiles/file/wobumuvefibuvunakamo.pdfIn PDF document text
    • https://firesystem.ro/imagini_ws/57615240903.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/ir9gu78rf7msm0cili8lpsabg9/kabidiwer.pdfIn PDF document text
    • http://kibbkw.com/uploads/files/15981618166.pdfIn PDF document text
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/87864349333.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c30df46b424---rawilekosox.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/16079547b4adf9---mogoluwuvodujidikun.pdfIn PDF document text
    • http://ahchala.com/img/file/dakeminekibazogusowisekur.pdfIn PDF document text
    • http://clinical-pain.com/pds/userfiles/files/xoxesowinekunajubosir.pdfIn PDF document text
    • https://astek-telem.fr/userfiles/file/gojatilufepivopemojow.pdfIn PDF document text
    • https://nabil-doukali.com/userfiles/file/bujuboxudap.pdfIn PDF document text
    • http://grimastone.ru/files/fivilizapavid.pdfIn PDF document text
    • http://colleges-in-tamilnadu.com/FCKeditor/userfiles/file/vetib.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/dukonolisanetipafurugu.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb4aff148c---7075860172.pdfIn PDF document text
    • https://sensesgrouphk.com/louis/STARKGROUP/ckfinder/userfiles/files/4568492070.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/ff8657f0865eea3be3224657c4f9b679/kakuv.pdfIn PDF document text
    • http://nppmaudaha.in/ckfinder/userfiles/files/kudakezavu.pdfIn PDF document text
    • http://effekt-film.de/files/file/42919124177.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=grade+1+subtraction+kumon+math+workbooks+pdfPDF 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_off0000bbff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBFF 17136 bytes
SHA-256: 4a3dae3fce19dbb8d1d2c01ba5e97e644e4645492aac2ca7e912a1b7da82601e
font_01_sfnt_off0000e8ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000100c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C3 11348 bytes
SHA-256: 1a5d89335cad026b965331bd2056f6202bd37e97a5477a69bd01e1ea87467d24

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