Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa29bf80cf63672e…

MALICIOUS

PDF

82.9 KB Created: 2021-09-07 23:06:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 77c3dc30d056b8ed9b1394157428ea7a SHA-1: 3529ccdf96b1925cf12b87a11b8ea82b0a523d4f SHA-256: aa29bf80cf63672e883e048d5fc0c19a48b1e8acf39aa960e0fb9dffe5325dab
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm, with numerous URLs pointing to compromised WordPress sites. Several heuristics indicate this is a link farm on disposable hosting, and ClamAV detected it as Pdf.Phishing.Trojan. The ML classifier also flagged it with high confidence. The document body is heavily obfuscated and unreadable, suggesting it is not intended for human consumption but rather to host malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082abfd743fd---juwefujajozipaxixidogiker.pdf In PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/jo2hhaha7hb66l2ae2eu35p1ft/84826412037.pdfIn PDF document text
    • http://mhspartan79.com/clients/9/97/97d0d0788ec4d6723ba7be3cd58769e3/File/dapapuvaxaxelobomalidu.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/8f703438732b012797c8f7f97ea64fe1/nemisopevowipejagumenowu.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/86eoc2bafrk71e27pbfmb42tc5/44306799244.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073162d3a0bd---direbimopode.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/818bab1005c5eb093419be9fd76794b8/renagaxagosak.pdfIn PDF document text
    • http://enjoybowlramenandpoke.com/uploads/files/62239610109.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/mexetilibud.pdfIn PDF document text
    • http://mdknoodles.co/uploads/files/56028008178.pdfIn PDF document text
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/89023758681.pdfIn PDF document text
    • https://bcm.es/files/galeria/files/55915329827.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/75f62bb9de0d305e5894ab19aefee3ff/vowijosofenomebo.pdfIn PDF document text
    • https://sportsslife.net/upload/ckfinder/files/sitop.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160772a80d6a89---63737043629.pdfIn PDF document text
    • https://jeanmarcrobion.fr/userfiles/file/waxevijen.pdfIn PDF document text
    • https://embassyinvietnam.com/webroot/img/files/44106873222.pdfIn PDF document text
    • https://guijek.com/userfiles/file/dorogava.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/79461e2f5914b6fa5a54d61daf063f27/12060736750.pdfIn PDF document text
    • http://bushurov.ru/images/files/nagomanovabapagatoso.pdfIn PDF document text
    • http://sun-tes.ru/files/file/8101468408.pdfIn PDF document text
    • http://gamjagolla.com/uploads/files/90086637284.pdfIn PDF document text
    • https://kocarbonag.com/luutru/files/56955450763.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=antibiotics+and+their+mechanism+of+action+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_off0000da9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2AF 19108 bytes
SHA-256: 4b5cda1a5c1902196b9c0cf63629b2de31e7423bb3b5df793f24ccf8c61fb1e9
font_02_sfnt_off000124b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124B5 10960 bytes
SHA-256: fe24b94339ee05907a9d96d5e2ad249861daceb6420bef288519e853bd0329e7

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