Malicious PDF — malware analysis report

Static analysis result for SHA-256 05c733abdfedfbc4…

MALICIOUS

PDF

77.9 KB Created: 2021-09-03 20:18:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 81cfc39d7e1c65b07e2cf45ebd9570c5 SHA-1: e429b09966463550f16d86f9081be040308ddcf7 SHA-256: 05c733abdfedfbc4c3b9060a95e712973f8a9c993ff81c6f5e2c5a0b0ae07266
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://gasthaus-steinkirchen.de/img/editor/file/suvadoz.pdf In PDF document text
    • http://biotop-zamosc.pl/userfiles/file/65376517512.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ae048c699---48584124608.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/demize.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/d50366c819863c1f5a8c99d014f23302/70276659643.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/ranazesu.pdfIn PDF document text
    • http://strategie-online.net/catalogue_dynamique/file/folorejajesujilibogado.pdfIn PDF document text
    • http://zae.me/datafiles/file/bezim.pdfIn PDF document text
    • http://longarmacademy.net/fckeditor/userfiles/file/70611991771.pdfIn PDF document text
    • https://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/36321o6lme3kg4l3kdjuqogpbo/84492512420.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba9f49c0168---napesiwuxunovajuputujaw.pdfIn PDF document text
    • https://cafe-malaysia.com/contents/file/witokutetanorezagomezogit.pdfIn PDF document text
    • http://anysoldierfundraiser.com/clients/a/af/af293656121fcb8b60a8c910089dd81c/File/lasamisinis.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/0f227abc93c150a6644cd3e1ee0b2e9a/11908107944.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/c56f75741b2947d2b17b37629024dfea/86097580504.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/zinidofir.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16075fb7969d5d---daxabeles.pdfIn PDF document text
    • http://thesnowmanicecream.com/ckfinder/userfiles/files/45977305937.pdfIn PDF document text
    • https://mayxaydungthienlong.com/uploads/files/files/wumonuwizoxepevepagix.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/a5ac433bc39b5dbba5100721bfccdb35/61777552292.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16083e880b0595---dapuvixajudozogokezup.pdfIn PDF document text
    • https://photojet.bg/userfiles/file/69237235615.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=manual+de+funcionamiento+vlt+automationdrive+fc+300PDF 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_off0000cae1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAE1 10920 bytes
SHA-256: 20619011bc7f2fdfca2eba388852e00c5a1f66e15d0bc3aac77814c279a35ea9
font_01_sfnt_off0000e42d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE42D 17620 bytes
SHA-256: eae01e1847453c254f81909a50b327cb1103d21afb2e0e35fae1d4f6ce557694
font_02_sfnt_off000111e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1