Malicious PDF — malware analysis report

Static analysis result for SHA-256 1df7db83714ea35b…

MALICIOUS

PDF

73.6 KB Created: 2021-09-06 14:16:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b06a1c55c167ab7cd84730f6f5011f44 SHA-1: c678a39cba1b6ba635139926d1a2fd7b24bc85b3 SHA-256: 1df7db83714ea35b326708dd7ff063f2c3369f4ce86ac485db5c88729668bf46
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or malware distribution attempt. It functions as a link farm, directing users to numerous external URLs hosted on compromised WordPress sites and disposable domains. The presence of multiple external URIs and link farm heuristics strongly suggests an intent to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://inwebjor.ru/uplcv?utm_term=college+planning+worksheet+for+high+school+students PDF link annotation
    • http://dichvutheapec.com/upload/FCK/file/zaxobosurezagafejonuwada.pdfIn PDF document text
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/92fdb68c12690154d905223c23452eb2/78118242035.pdfIn PDF document text
    • http://www.greenbriarpropmgmt.com/wp-content/plugins/super-forms/uploads/php/files/1281543fd47b6ece4892e208948c98ce/dojefes.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607b7d578163f---nusinepuwovolono.pdfIn PDF document text
    • https://cncunse.com/d/files/60000226381.pdfIn PDF document text
    • http://steakclubhn.com/campannas/file/76892074063.pdfIn PDF document text
    • https://guruvinodji.com/Userfiles/file/52184705997.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f0a87c8b08f---73046890833.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/ggk568icb884vt4km8r0g977a2/63677622892.pdfIn PDF document text
    • https://briljant-maleri.se/UserFiles/files/lurawujat.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/123db500ec1d07c554fb850ec2c73838/majudorivajirusexi.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607d10cdad8b6---62511551487.pdfIn PDF document text
    • http://aviafond.ru/userfiles/file/84189906910.pdfIn PDF document text
    • http://sculecuacumulator.ro/app/webroot/files/userfiles/files/78598875743.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/6e9d019248c625f508a59ce0c18d60c5/pimojijite.pdfIn PDF document text
    • http://corporatiegids.nl/uploads/files/24608210330.pdfIn PDF document text
    • https://birotex.rs/images/files/68856603020.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/96430949477.pdfIn PDF document text
    • http://kudusde.org/resimler/files/tifugagolenigoka.pdfIn PDF document text
    • https://cornerstonelaw.eu/userfiles//file/tasaxerodaganejofe.pdfIn PDF document text
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077e83197363---44682309008.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160753bc39b9b4---nisekemopafaloxap.pdfIn PDF document text
    • http://vetsnab32.ru/userfiles/file/13962716142.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_off0000becf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBECF 15504 bytes
SHA-256: c91ceb2e34103a20fe49d7d8ff5c6c7314be22fccfbe33c0b8acc13afc2ebe15
font_01_sfnt_off0000e64f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE64F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE66 11208 bytes
SHA-256: 8d2eb456085cec37b6e72752fb90c3d728a68d0563bb95e1d7a44c349d6ce750

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