Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fbbaffdd342a262…

MALICIOUS

PDF

80.9 KB Created: 2021-09-03 07:36:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: befd8287c2693bd9b6c35dbeeb53bd0f SHA-1: 74b4791ec6949dc89281eed1fe1d1140a534f4bf SHA-256: 8fbbaffdd342a2628ca0edbba7ad1651d3a19ef82300c0829ed5885c33079ad9
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to numerous URLs, many hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the malicious nature by identifying links on disposable hosting.

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://watsonwilliamsreunion.com/clients/82103/File/zemaxe.pdf In PDF document text
    • http://winkeleninzundert.nl/uploadimages/files/48102017201.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/farodewap.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b4b5e986bf8---14538173247.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/f1e3e17f40db1b95c1902e37b09d568b/50431786522.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/difafiposekelojewe.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/2vdqk3g2a9m8d6n2cb7lqobd76/70451394222.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/29a2c5691a51474702ae96a2602d3a2b/39711713796.pdfIn PDF document text
    • http://kantoromega.pl/userfiles/file/mibobikujusugefiturukedo.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/24721f1f4409e1d59b65f6fb3db208a6/87908099446.pdfIn PDF document text
    • http://iburgisidimarsala.eu/userfiles/files/kowemotewobeleladidaxef.pdfIn PDF document text
    • https://weyergans-hcc.lv/userfiles/file/xufutefu.pdfIn PDF document text
    • http://fructusartis.com/i/File/pivav.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/166f1ccfd0a74476b7e83fdc64308378/79560325825.pdfIn PDF document text
    • http://tischlerei-schlusche.de/sites/default/files/file/8998403794.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9797b6d5a---89515147181.pdfIn PDF document text
    • http://sity-luxe.ru/userfiles/file/tirive.pdfIn PDF document text
    • http://fipjp.com/userfiles/file/pibibiroroliratap.pdfIn PDF document text
    • http://seasonsblinds.com/uploads/ckfinder/userfiles/files/zepasorobefebuw.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9a245980c0---16122207057.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/kkf149vetk710a13ns85dmgp2g/47532078849.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/16074535e65e6b---3839320051.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=textbook+of+practical+analytical+chemistry+pdfPDF 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_off0000d647.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD647 11296 bytes
SHA-256: 1e76c01f76af06eb7243b50f8825ecb43d346d13b14dda6edd50da68fc86cdb4
font_01_sfnt_off0000f073.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF073 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010885.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10885 17576 bytes
SHA-256: 72efd77c6852122f017314d2cc73b2612ed2315355176654ee97bf6f711b7f66

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