Malicious PDF — malware analysis report

Static analysis result for SHA-256 71ed537af345bc35…

MALICIOUS

PDF

89.1 KB Created: 2021-07-31 19:47:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 056d395461e931c5926e8a051d6b7ca0 SHA-1: dbce40bcc62a5b7b4212e36e7135e4d66710df9f SHA-256: 71ed537af345bc352a2d0546b63627d0ac948f63d7bacd852d8fb363f94ecbbf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF document was flagged as malicious by ML classifiers and ClamAV, indicating it is likely a phishing lure. It contains numerous embedded URLs, many pointing to compromised WordPress sites, designed to redirect users to malicious content. The presence of 'utm_term' parameters in some URLs suggests an attempt to track user engagement with phishing lures related to sensitive topics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://irlanc.ru/uplcv?utm_term=equifax+data+breach+july+2017 PDF link annotation
    • http://bscsaoner.in/ckfinder/userfiles/files/23396358148.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/0adc763d954c649033bc3f3623595fc7/98216620885.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160fabe3479173---gezisuzi.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/4facbbcfac0456dd95998fa353beb37c/13301327976.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/9ojp9d0munelulo74okea18eb5/laruvup.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/opos2jip882dl7hnd2r059svpk/684755419.pdfIn PDF document text
    • https://naucharts.com/ckfinder/userfiles/files/45153886714.pdfIn PDF document text
    • http://zoomkish.com/basefile/zoomkishcom/files/befagomobesipadamiverin.pdfIn PDF document text
    • http://vipnjl.com/userfiles/files/28593276353.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/5dc3707ca6cfe101eb82b7af31e1d0d0/lelulofilerudidesunumul.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/v7034jdc36ngtaoj87q1th9hf3/4941993036.pdfIn PDF document text
    • http://jevades.com/aircraft/fckimages/file/rolosomakajowivalopesi.pdfIn PDF document text
    • http://fxmeat.com/upload/file/7d6ff9b7c1fbad562248cba2b619ba7d.pdfIn PDF document text
    • http://midel.me/userfiles/file/pawoxagap.pdfIn PDF document text
    • http://frankslawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/24475175917.pdfIn PDF document text
    • http://boothbayharborshipyard.com/userfiles/file/vupubugidizosobewutale.pdfIn PDF document text
    • http://strategie-online.net/catalogue_dynamique/file/49461676576.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160af60c19f998---21504338112.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/e3f9a3oejn0918342lj0ro35il/zemewidijedur.pdfIn PDF document text
    • http://superlitefan.com/uploads/files/mibakuximejujaguk.pdfIn PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/946b52bc76bc7001ccc18535281676c7/degamagalalukefiv.pdfIn PDF document text
    • http://daindnc.com/fckeditor/userfiles/file/58068660642.pdfIn PDF document text
    • http://bfo-walkforhope.com/clients/e/eb/ebd0efab9cd97e953e90891d9eec7aad/File/54285506018.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_off0000f6af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6AF 11240 bytes
SHA-256: 3396439e20f2496d0cd3bac55c77b473390a95373d74f36304bf60392e9331bb
font_01_sfnt_off0001110e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1110E 17368 bytes
SHA-256: 0d784b71e0dd0bac5296ab3bd45bde0e3c6098e552eddd0797d2da4a5f694426
font_02_sfnt_off00013e8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E8F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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