Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f3c635673c8d4e6…

MALICIOUS

PDF

83.9 KB Created: 2021-08-13 10:57:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 50a9609dd4c4580a5ff7d4560b9493a0 SHA-1: 0de49fcfa04092492eb205134f41a57149123f3a SHA-256: 9f3c635673c8d4e6e00cf689064adbf3732baa48e8f48b9f1f99a1cf67e05c83
156 Risk Score

Malware Insights

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

The file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with many URLs pointing to compromised CMS uploads, suggesting it's used to distribute further malicious content or phishing lures. The PDF structure and numerous external links are consistent with a malware distribution or phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160796de7e74ad---netuj.pdf In PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/26209695842.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/a2e55ac768fc558380f0c7af2748d1e6/45358378815.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbdbcc30cf---zasovumivavutigina.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abd66507d47---21949381994.pdfIn PDF document text
    • http://ivelinabozilova.com/userfiles/file/66194393540.pdfIn PDF document text
    • http://sity-luxe.ru/userfiles/file/zipaxolekesomeputepoj.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/82bb1eef63b05d20bf3fe2b36a6507bc/4027533848.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a56a11491---farujalizanetip.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089d9854de04---fipamajezejatirazun.pdfIn PDF document text
    • http://chelseafoodmart.com/uploads/files/1136769999.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/gojivavawizikakinipole.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/7e255c54fc9530880f1113edfa22add5/lobegud.pdfIn PDF document text
    • https://mama-light.net/business_school/uploads/file/78880981964.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/aa6f8f0b72b62b9592c321c1b140f321/98502724869.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f7aba6ced6a---ponepepip.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021071606283690.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079bb5676e0c---21349708383.pdfIn PDF document text
    • http://creaorganization.com/depo/sayfaresim/file/lizomo.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16108754adcbf5---vevasun.pdfIn PDF document text
    • http://banlinhkienlaptop.com/userfiles/file/4531972693.pdfIn PDF document text
    • http://sobsai.com/ckfinder/userfiles/files/xekix.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3b009d925---86339879410.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/f6c35476ae0c747cb52c31edfbde850d/10890504739.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+replace+a+ge+spacemaker+microwave+doorPDF 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_off0000e4e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E4 10988 bytes
SHA-256: 3853c968d0a8e4351214f1ab78f2439203cafce5a5cb8371a5fe070243922b46
font_01_sfnt_off0000fe43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE43 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011655.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11655 16884 bytes
SHA-256: 5591f3bc9bcc3ff3ad926d9be7c050402a10348fc0172d0ecea6c6f9c0a25090

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