Malicious PDF — malware analysis report

Static analysis result for SHA-256 a395f252c875cfd4…

MALICIOUS

PDF

69.8 KB Created: 2021-10-02 16:53:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: fbcccc042ed98944635a4ed95ba08e59 SHA-1: 9e6acc2230a74e1bd99a39b1a4f80dc1998d6202 SHA-256: a395f252c875cfd4a8b9136d00acd07b5de1ab24751147167fcaf849e57b33fe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content or phish users. While no scripts were explicitly extracted, the nature of the URLs and the detection suggest it's designed to lead users to a malicious payload or phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://sumosushingrill.com/uploads/files/12022282509.pdf In PDF document text
    • https://smwebtechnology.com/arishayurveda.com/userfiles/file/voxupegevelifujoves.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/33562802042.pdfIn PDF document text
    • http://www.fdconsult.qa/public/uploads/cms_files/pazusolireb.pdfIn PDF document text
    • https://campfun.myhost888.com/upload/ckeditor/files/14532549067.pdfIn PDF document text
    • http://watch62.ru/files/files/50296296063.pdfIn PDF document text
    • https://www.hermanosvalerorecio.com/ckfinder/userfiles/files/86929788982.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/094999cfe32d688ad97e7e51e51ae5ea/64291528042.pdfIn PDF document text
    • http://mediaworld.pro/ckfinder/userfiles/files/vuwamamumulowibimujetixe.pdfIn PDF document text
    • http://esen.life/userfiles/file/22077547212.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/wobudorupipesutiwoziv.pdfIn PDF document text
    • http://carszana.com/image/upload/File/90097335443.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614c1b5c6d83f---kuxedavevotid.pdfIn PDF document text
    • http://materialdeestudo.top/userfiles/files/bexukeburepazogodedifefov.pdfIn PDF document text
    • http://salonorganica.ru/upload/files/31480904948.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/81336200768.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/bfaf27451725926cd1923a4183c6dec8/57277526022.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/72429bb35b8ccb2f2c695f971119493e/lebaramukuxelo.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/f7d4f4d0391a10d2bd082968b2aa7c16/48293955243.pdfIn PDF document text
    • https://geneticapanama.com/userfiles/file/lugadisitumavuzirimajufu.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/q6ho6qvh885qt9svv3gv0d8eb1/19870582553.pdfIn PDF document text
    • http://ch-bovi.com/upload/files/sezebatalaj.pdfIn PDF document text
    • http://rulife.ru/ckfinder/userfiles/files/90634782454.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=lcm+of+1+2+3+4+5+6+and+7PDF 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_off0000b147.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB147 10732 bytes
SHA-256: 5bee8804d155882b300f790e60739214a4006ef206ec862a65661dd3da4df4f4
font_01_sfnt_off0000ca12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA12 15580 bytes
SHA-256: 3a45056be9afd637d1523cd5c5d5932645778b62f729f784ba4469f96e137014
font_02_sfnt_off0000f1b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1