Malicious PDF — malware analysis report

Static analysis result for SHA-256 868413e9a9929205…

MALICIOUS

PDF

82.1 KB Created: 2021-08-29 04:33:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 07120166454b1010f28948096ebb441f SHA-1: 47bdbdf4e43ee71bbdbd3b58b44fc65be00fb2fb SHA-256: 868413e9a99292051db9af0d5adfd8fae3ef1166e0edfda02423c80130cf4429
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm directing users to multiple external URLs, many of which are hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the nature of the link farm and the detection results suggest it's designed to exploit users who click on the links, potentially leading to client execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://annamsaigonlaw.com/upload/files/18506289636.pdf In PDF document text
    • https://newtech-utm.pl/userfiles/file/73428788824.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acdacc3287b---botesegitavugew.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/govubowetalipifi.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/40559659188.pdfIn PDF document text
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbd75cbac0---51297543918.pdfIn PDF document text
    • https://smgbid.com/ckfinder_userfiles/files/68062709756.pdfIn PDF document text
    • https://j-kowalewski.pl/uploads/userfiles/files/gagoxarepipubinapigewemax.pdfIn PDF document text
    • https://pfollowers.com/ci/userfiles/files/90163650409.pdfIn PDF document text
    • http://chelseafoodmart.com/uploads/files/39023234542.pdfIn PDF document text
    • http://www.insight-assessment.com/ckfinder/userfiles/files/52884519672.pdfIn PDF document text
    • https://elesud.it/img_pagine/file/satiwobilimum.pdfIn PDF document text
    • http://copingconversations.com/userfiles/file/kizuxesefefiginizumasizu.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609c277adde3b---53732609666.pdfIn PDF document text
    • http://activesolutionelectric.com/images/file/nobozogujunux.pdfIn PDF document text
    • https://dichvuketoanvn.org/uploads/files/xupunosofapawukuvux.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/sizimubolivuwovapade.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bee4e0f3a45---98348996911.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b49f82b9ba3---15981378356.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/4c12b2bcb025ebbe8e77753baf7a4192/fiborarufipozitujokezo.pdfIn PDF document text
    • http://yanartextil.com/firma/files/rezegeduse.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/i28hbsanmb838ijmnjgafh6nd2/23912504858.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=three+stages+of+pertussisPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD78 17388 bytes
SHA-256: 1edf3e72b289029a846958bd40ded89ab14b91dfa214d37754342d652bb90687
font_01_sfnt_off00010aa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA8 10548 bytes
SHA-256: eb4ff5ceb5df2231e190e36946cd191343d2f9299cc06d9e77773b727fcb89e1
font_02_sfnt_off000122e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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