Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc8dd60b2fc5d640…

MALICIOUS

PDF

82.7 KB Created: 2021-09-06 03:24:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 352c6058fc354643f1298f00a512f7ab SHA-1: 5737d2491b73ef156ff8824cdcae5178390db274 SHA-256: fc8dd60b2fc5d640fa665d540cc76fd6180cb8c22116e7d56fbdd72f52d8c9b6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple domains, many of which appear to be compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://garglob.ru/uplcv?utm_term=importance+of+objectives+in+a+lesson+plan+pdf PDF link annotation
    • https://psychotherapie-coeppicus.ch/userfiles/files/20162520709.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160926c5172d69---zeborexugusanoge.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c63e3dd9f6---xusamepotigajinopuv.pdfIn PDF document text
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607225bbdfdfe---zowesukosaf.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/fubelopufuvaxoru.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/rr6c6l19bd93r4qcjj06m8bl56/59899009998.pdfIn PDF document text
    • http://consol.hu/images/uploadedimages/file/narubuxurevumogaluta.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/6b102a6e2a6e2d5dd08f66125b5b6f4f/54621203293.pdfIn PDF document text
    • http://hasyo.net/files/file/romogokimuli.pdfIn PDF document text
    • http://interel-rus.ru/test/sites/default/files/file/22374279916.pdfIn PDF document text
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606dc2ee1e9a2---wewesid.pdfIn PDF document text
    • https://securitydm.com/slicice/file/xofopaputevuxebepovanibu.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/d9q3qfjv5oldg5ma1s87l3o983/pexusinirutesivibuketabeb.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/98887832986.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/k7d5us09c6n2crqutiu22ro8q0/19835578802.pdfIn PDF document text
    • https://dcimx.com/files/31019992635.pdfIn PDF document text
    • https://digireg.gr/upload/ragatanototomedapagibami.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/87477785826.pdfIn PDF document text
    • http://atomleasing.ru/media/File/xalejopogomupibiv.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/39056f6cfda4b5089149c3448489c08e/56892906578.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609168bc40281---85657707346.pdfIn PDF document text
    • http://chunmianxian.com/upfolder/e/files/20210906075554.pdfIn PDF document text
    • https://luathoanghuy.com/uploads/files/logamifurenigejepatuxu.pdfIn PDF document text
    • 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_off0000df0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF0E 11068 bytes
SHA-256: 85319bb1bf6c6ffea9e39edc0bad7de9bebd9b31141981f4dd78b22bf6db2bfc
font_01_sfnt_off0000f88b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF88B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001109d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1109D 17204 bytes
SHA-256: 072c345356783ba3bfc2acbf41262d09a1b2669c800ecc639526f2939fcc1fb6

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