Malicious PDF — malware analysis report

Static analysis result for SHA-256 83d29796a50a0c12…

MALICIOUS

PDF

85.0 KB Created: 2021-09-01 18:00:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ff2dfa4079e2dc7dfa606fff5896af15 SHA-1: 25ff6b40adb8409917751db2faff74c8d5be2deb SHA-256: 83d29796a50a0c12cce8aaa6266f7baaa85ef25465e4fbe69d40e8778d6a78f9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by multiple heuristics and a machine learning classifier. It contains numerous links pointing to compromised WordPress upload directories, suggesting it is part of a link farm designed to obscure the ultimate destination. The presence of these links indicates an attempt to lure users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085e8f88b9e9---64559644126.pdf In PDF document text
    • http://blevy.com/ckfinder/userfiles/files/konowowaxer.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/m9htojebu92hs1kj0mh46bomr6/solofuwimivepevevuzixejo.pdfIn PDF document text
    • http://silverleafspa.ca/clients/10619/File/27458578648.pdfIn PDF document text
    • http://dilimkebab.com/userfiles/file/poxegerevixabizazosat.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/16071532b4b6f0---25206187053.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608acf8c1a1ac---venajegifevazine.pdfIn PDF document text
    • https://monocroma.it/wp-content/plugins/super-forms/uploads/php/files/77760272506fde7dc0b3fa87c894e86e/46598583676.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/5i26up9114rvphicm46v8tgdt3/donapikisebo.pdfIn PDF document text
    • http://omatsuri.kr/data/userfiles/files/69699070661.pdfIn PDF document text
    • http://springhs1988.com/clients/a/a7/a70db2535ed58991dd9724faf9b165d0/File/59654184141.pdfIn PDF document text
    • https://gobelsprofil.com/upload/files/64931645981.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16089e7ed382cb---82613280724.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd458ba9b15---faboxuju.pdfIn PDF document text
    • http://famillespourstarlight.com/clients/a/a9/a9b42c05011d3bb27e7f7ec2ed30324f/File/45326600493.pdfIn PDF document text
    • https://hansenlight.com/UploadFile/files/lemapafip.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bca24ab499---43746066549.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf066c7f7e---lekojafalulapip.pdfIn PDF document text
    • http://nomorecpapmachine.com/userfiles/files/91706611271.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/edcd4ef428503dc5b57d104edf0b26ec/luvegosawedewuvito.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/raxilidawu.pdfIn PDF document text
    • http://07-3739589.com/CKEdit/upload/files/30252342425.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b653dc76b88---43531530134.pdfIn PDF document text
    • https://metnar.pl/web/uploads/files/11844332656.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=monthly+current+affairs+july+2020PDF 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_off0000e4cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fce3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE3 11012 bytes
SHA-256: 3c5fa2b99f64e09158939d0e1d21d55f62a4f4f67b83f9a3aef0d3815ea559ec
font_02_sfnt_off00011679.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11679 18636 bytes
SHA-256: deeeabece4f7dfd97a720372a05031290ead1dcafe8e3b8a1a03572a58069d45