Malicious PDF — malware analysis report

Static analysis result for SHA-256 adbff349b53ed4e7…

MALICIOUS

PDF

69.9 KB Created: 2021-10-01 01:58:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 4ecdbfe37a7f320547f1da276731b891 SHA-1: 6a40ecd672ece8d2035451a61f8c48e6ff454027 SHA-256: adbff349b53ed4e71c2c77c57a8814355b6fab5461ec249fa3455e8d0fd8e162
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or to serve further malicious content. The file's structure and URL patterns suggest it's designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://hydratrend.com/application/third_party/ckfinder/userfiles/files/78930548012.pdf In PDF document text
    • http://cathugo.de/res/wysiwyg/file/29307929100.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614146ed30398---64136048855.pdfIn PDF document text
    • http://autokolcsonzoszolnok.hu/admin/fck_upload/file/pozixi.pdfIn PDF document text
    • https://legyenegyjonapod.hu/userfiles/files/puwatokemeginizopo.pdfIn PDF document text
    • http://turar-mussin.com/userfiles/File/turukis.pdfIn PDF document text
    • http://babyindex.nl/images/uploads/2382048622.pdfIn PDF document text
    • http://villabrown.it/userfiles/files/8051600090.pdfIn PDF document text
    • http://eapver.com/upload/ckimg/files/202109210701311904.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/c4fb95842d0dfd6cab1f0f0eda90bd1c/77117777882.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/e9d0b57dc07832cde41dc6a51aa6ffb2/82960543547.pdfIn PDF document text
    • http://varadimasszazs.hu/uploads/files/felexupoxut.pdfIn PDF document text
    • https://florissantdesign.nl/docs/Image/file/1556767460.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/75c1c19875046a010c26f0bf7f8c56fd/72952387781.pdfIn PDF document text
    • http://alpinist.store/sribati/editor/uploadfiles/80992590694.pdfIn PDF document text
    • http://triple-a.co.th/ckfinder/userfiles/files/42201999766.pdfIn PDF document text
    • http://year-c.com/upload_fck/file/2021-9-17/20210917130730480131.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/fixagidusudej.pdfIn PDF document text
    • http://steffis-strassladen.de/userfiles/file/37006676482.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/e55b60e86e2b28e8e697359e2c01360c/49218436708.pdfIn PDF document text
    • https://alansglobalservices.com/ckfinder/userfiles/files/20273828636.pdfIn PDF document text
    • https://hondaotohaiphong.vn/upload/files/nefupakazisoligujubipomi.pdfIn PDF document text
    • http://dhf-china.com/d/files/vatop.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/alg4q3urq51iu2s6n4o0c8mqa7/kerowujowudomukorufew.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/r2u2rm5jhcv0fc2uq1nhoe75c0/39561819771.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=wonder+valtryek+qr+codePDF 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_off0000b217.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB217 15844 bytes
SHA-256: 012e61a14c1517e91e99e4b6c8261d8a1f314c8066d637a627336575577845d1
font_01_sfnt_off0000da5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f273.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF273 10516 bytes
SHA-256: 73e9712d7cdcbaddcc990d331964b33cff0d79c3525c16740497b500ad74bca6