Malicious PDF — malware analysis report

Static analysis result for SHA-256 42ac0cb8294457ea…

MALICIOUS

PDF

71.7 KB Created: 2021-10-03 10:51:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 035cef52ba4da3fa85b0ba228eefbc17 SHA-1: 9f1bc0b36f72af2ddd4fbba9e5b352e3a57327b2 SHA-256: 42ac0cb8294457ea03631cbd9ca6da90c0b193f340fb7b5cb9d4d84a679d0adf
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting domains. The primary goal appears to be directing users to external, potentially malicious content rather than executing a direct payload from the PDF itself.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://soi.icami.mx/ckfinder/userfiles/files/dotalawugofolibuguzopan.pdf In PDF document text
    • https://starfoil-mail.nl/uploads/wysiwyg/60806869873.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a7b886f58a---12188876403.pdfIn PDF document text
    • http://netichikawaya.com/userfiles/file/54995362836.pdfIn PDF document text
    • https://www.anoregmt.org.br/ckeditor/ckfinder/userfiles/files/51489768709.pdfIn PDF document text
    • http://amicalelaique-guyancourt.fr/ckfinder/userfiles/files/wubamuzivipegumipamenuv.pdfIn PDF document text
    • https://mimpisiluman.com/contents/files/54336525671.pdfIn PDF document text
    • http://sirmamedia.com/ckfinder/userfiles/files/zinalimexim.pdfIn PDF document text
    • https://honghow.com/ckfinder/userfiles/files/karogojitodif.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/gucvv8tn3te1h299srgkhnpsl8/25901297667.pdfIn PDF document text
    • http://littlepearlspublishing.in/data/eimages/file/25505560585.pdfIn PDF document text
    • http://state-lithium.com/upload/files/64308510712.pdfIn PDF document text
    • http://aranysolyomfeszke.hu/editor_up/35847447825.pdfIn PDF document text
    • http://master-br.ru/img/file/bujaferiwugo.pdfIn PDF document text
    • https://llibreriaha.com/img/events/file/kimamezakifol.pdfIn PDF document text
    • https://newcar-rental.com/uploads/files/202110010432228923.pdfIn PDF document text
    • http://buren-kompanie.de/userfiles/files/96477635877.pdfIn PDF document text
    • https://activsport.ro/userfiles/file/52074025829.pdfIn PDF document text
    • http://folientastaturen.pl/_data/file/33881380448.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161435382c0461---lajubi.pdfIn PDF document text
    • http://www.propper-droppers.nl/files/file/93473363068.pdfIn PDF document text
    • https://rewaqousha.net/userfiles/files/bexukoworulerusurisab.pdfIn PDF document text
    • http://www.bluefashion.cz/ckfinder/userfiles/files/viwugefofugopak.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/16139dc59c393c---98195927341.pdfIn PDF document text
    • https://bodzlomu.com/userfiles/file/7461992547.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=america+before+columbus+answersPDF 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_off0000b2e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2E5 17932 bytes
SHA-256: db7d2fcd3995a87452c10229eadebc4d18166ca502611acd4572ed937fca5992
font_01_sfnt_off0000e09e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE09E 10704 bytes
SHA-256: 59977d21376d27ccb06d5b36e47af3d8a3f549624e1d726e39e9a2a0c2bc9b84
font_02_sfnt_off0000f938.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF938 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1