Malicious PDF — malware analysis report

Static analysis result for SHA-256 db6b32c024b85510…

MALICIOUS

PDF

86.4 KB Created: 2021-08-19 17:59:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: f13f21eccb65828254ff50cad75098bc SHA-1: 9fb041e16bcd2cf53b0a771e4068f3664cef6836 SHA-256: db6b32c024b85510e7c70fcb46af85bcde1da2bf37f57804055b60b5670eb311
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to potentially compromised WordPress sites and disposable hosting. The document body is heavily obfuscated, but the presence of many external links suggests an attempt to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://jotekonybakterium.hu/userfiles/files/51750149624.pdf In PDF document text
    • https://abe-rdc.com/userfiles/file/35117852075.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075d242197c5---44437123724.pdfIn PDF document text
    • http://boeschfamilytravels.com/clients/43210/File/moxawijowekafufibemirazam.pdfIn PDF document text
    • http://spoilersmensgolfclub.com/clients/865201/File/33962947949.pdfIn PDF document text
    • https://smg.bid/ckfinder_userfiles/files/zuxanilejudegagizowakugoz.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f263d822f7f---71910031717.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/87qrdifb355c5kp8g221cngn46/biseluvafapexegunem.pdfIn PDF document text
    • https://basalyemek.com/ckfinder/userfiles/files/dokatipijodipobisiloririj.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/ddc8110bcdc8b2412e571414c355852b/45501498366.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1607025542a7a9---sixodojavenaluv.pdfIn PDF document text
    • https://harryfok.com/ckfinder/userfiles/files/67803397555.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/2078231097.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/ce53bcfbb9634565cb9a82502b1a48b6/mipusugulu.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/tilawutegoxiwijunutofi.pdfIn PDF document text
    • http://voszveszprem.hu/_user/file/46255594704.pdfIn PDF document text
    • http://pinedafoundation.org/imageuploads/file/68212235436.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/614a2ef676cb9492b4c548e694d0fe03/xufiduxijumije.pdfIn PDF document text
    • https://budapestpainter.hu/ckfinder/userfiles/files/tabikes.pdfIn PDF document text
    • https://rubyyadav.com/nbloom/fckuploads/file/23265617211.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/68b989f843e0c3499568586eca405dd3/29060990653.pdfIn PDF document text
    • http://aj-freight.com/ckfinder/userfiles/files/pabetam.pdfIn PDF document text
    • http://t-p-fortune.com/userfiles/file/terotamuxamadarufexuwurat.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c516f152a02---78201382422.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=what+are+the+three+fundamental+elements+of+a+school+curriculumPDF 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_off0000e93c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE93C 18732 bytes
SHA-256: daff81e826eb014dcc8fc895f94c5d79f30cdb34f054deb3da8038570c731102
font_01_sfnt_off0001189f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1189F 10836 bytes
SHA-256: 28e62a668ec441997bcd274607ac9e4a86f9795b5c1396f832d7d14f2a982621
font_02_sfnt_off00013176.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13176 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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