Malicious PDF — malware analysis report

Static analysis result for SHA-256 25a6ef51c26e64ed…

MALICIOUS

PDF

87.4 KB Created: 2021-06-28 11:48:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 32809a23bc8de343b50d58d52ccc816a SHA-1: 0d8c1405151fe9e3f38da19dc1a2d98c9bf9213c SHA-256: 25a6ef51c26e64ed8f381318c393abf307821ccc5a5fb29722076b49ec15d2b5
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS upload directories, indicating a link farm designed to redirect users to malicious content. The presence of these links strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://sh-ruiyangcpa.com/userfiles/file/2021-6///202165233105707.pdf In PDF document text
    • http://xboxheerlen.nl/userfiles/file/kijesexifiwedomunaruti.pdfIn PDF document text
    • http://boilerservis.ru/uploads/files/xivaja.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/26978469838.pdfIn PDF document text
    • http://twothirdsmajority.us/clients/38522/File/34741741021.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/96157156550.pdfIn PDF document text
    • https://binarbaidequipment.com/public_html/userfiles/file/lolovarad.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cecb4434e6b---81925081487.pdfIn PDF document text
    • http://malagi.pl/user-files/fck/file/vukitedopuburux.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/qfk5ld067h4l9oncuu0tkg83g1/tilexedefubirevid.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/7235960561.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079067ee1efd---48495557164.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/fkg2bckj501e9120cgjlla4kum/xavulutepasitu.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/836dbbcdd43c45f6a88fc83a172db771/vuwomupixotatov.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/ddb132c308f542b53bb419bcf56abfb3/15500347499.pdfIn PDF document text
    • http://nowator-zpu.pl/userfiles/file/rekujozufirajizire.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/160708244bb52c---30907663817.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d397a78c02---nitewunekigi.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/160878c7763553---megipefopeduji.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/1d7525c343b2e35d294de63bdb233398/13229845775.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/bn0f79sr6smtrqrp4o51kkaet1/kixisada.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/pebokipedomikagafomewus.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/45513777307.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160acf82b993c2---gunolinabenabonod.pdfIn PDF document text
    • http://ildungrice.com/fileupload/fckeditor/file/7649294266.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=for+all+star+tower+defensePDF 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_off0000ebaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBAF 20508 bytes
SHA-256: bf055d2b1b86c39ea918dbf0bd74c9c87aad0135673ee3ff1ef2e29323b5b91a
font_01_sfnt_off000120f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120F1 10320 bytes
SHA-256: ca787d508695d5ba43fd5c0f0b11ee8b2b788d05fa350053be9db9da146e39cc
font_02_sfnt_off00013869.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13869 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1