Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2d1495adebccbc0…

MALICIOUS

PDF

93.9 KB Created: 2021-08-10 12:49:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2caef0d204cd7c59c072c79c135c2223 SHA-1: e02e588c26c845663ffb0b98255f4b960933aa54 SHA-256: b2d1495adebccbc0a26258f1a9a3e2d4b48379dd3785ee8f1fd2e1ccbe70c066
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV specifically identifying it as a phishing trojan. The document functions as a link farm, containing numerous URLs pointing to external sites, some of which are hosted on compromised CMS uploads or disposable domains. This suggests an attempt to lure users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9726

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://metrocars.london/survey/userfiles/files/63888242160.pdf In PDF document text
    • https://rieker-consulting.eu/files/file/91844205778.pdfIn PDF document text
    • http://bacvietexpress.com/upload/userfiles/files/numad.pdfIn PDF document text
    • http://geteffective.biz/uploadfiles/file/50281488909.pdfIn PDF document text
    • http://www.benyowsky.com/resources/files/67291569015.pdfIn PDF document text
    • http://cogersquest.com/clients/f/f6/f6194b381802d71b6842d6160e8859b1/File/16525442992.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/wenuvalamuwivupexewixudeg.pdfIn PDF document text
    • https://eviinstall.com/userfiles/files/84286538473.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/vhlk8rne9cda5q6l921d22egb7/zizosalosesadapoguk.pdfIn PDF document text
    • https://sportcity.bg/webroot/img/content/files/44932271222.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be3703ac384---9478478204.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/nqjp3th4l2db4tu7efqlqr0kp0/13649990687.pdfIn PDF document text
    • http://pr-dienst.ch/file/golafuxanananud.pdfIn PDF document text
    • http://choinka4x4.org/cms/files/file/7593235987.pdfIn PDF document text
    • http://surtek.biz/image/files/20150204_223233.pdfIn PDF document text
    • http://chipublichouse.com/ckfinder/userfiles/files/86309890661.pdfIn PDF document text
    • http://opuspoint.com/ckfinder/userfiles/files/razodedozenafi.pdfIn PDF document text
    • http://takeacode.net/user/d41d8cd98f00b204e9800998ecf8427e/file/54568438418.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae61c39a93---goxudatozaf.pdfIn PDF document text
    • http://ncabhsa.com/clients/875427/File/46213348071.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/e195102ed918c6ee9b21661e143df0fc/ziwupafez.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607333ce358a2---devuwokebazewavediva.pdfIn PDF document text
    • http://nicolalazzarotto.com/userfiles/files/jowuduzexake.pdfIn PDF document text
    • http://fouladsazanco.com/Upload/file/63714997947.pdfIn PDF document text
    • https://pt2-turbo-j3t.com/contents//files/41471032124.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/89519113010.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=traductor+ingles+a+espa%C3%B1ol+fotograf%C3%ADaPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000effd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010814.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10814 11128 bytes
SHA-256: d1bb02a995c92c12c46fb88ececd055e35e87f7a4beebd4b6bc814a32ebc0c9f
font_02_sfnt_off000121ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121AB 18424 bytes
SHA-256: fc78a5dc4459c48adef1160f7d1f82a66bfd73f1578c0debcaf32397472eae44
font_03_sfnt_off00015125.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15125 16324 bytes
SHA-256: 4f2a9a26ae94a9e4f3ec726fc0ffc7e1e6ed9edd0c7cee3f16fc637664c46f3c