Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c7e6fac0b68e60d…

MALICIOUS

PDF

85.6 KB Created: 2021-06-26 05:06:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 061c10db83517f62add53fd951791cda SHA-1: 0257a63384e88c367bd3737f140102402451b0df SHA-256: 0c7e6fac0b68e60d14a95eb5fb0189f23d7446f033db8bec34b8a44b5a69367e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to leverage external resources for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://nomylo.ru/uplcv?utm_term=copy+pdf+page+to+word PDF link annotation
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160971f4fa3256---jagezonevikesi.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/j1e8juo8lpdqpkdmrv8p52i1si/zuzegoturolo.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/5hctnc9kag8374h8huk3ogtal5/vozutexireve.pdfIn PDF document text
    • https://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/2q3cjvjm7595819uhgn2lak1ip/sijokek.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/siruvejukekon.pdfIn PDF document text
    • https://dangeloremodeling.com/nbloom/fckuploads/file/dewolizunerewaraja.pdfIn PDF document text
    • http://e-hematologica.pl/users//file/bogapomobusogiku.pdfIn PDF document text
    • http://kubabus.cz/novy-web/upload/file/wegenolowabonoliza.pdfIn PDF document text
    • http://happypalettebnb.com/CKEdit/upload/files/8837125067.pdfIn PDF document text
    • http://erex.hu/upload/file/13216476206.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/at1f3ibedjdav5p3a6gnat9hok/32913887503.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/6fb0c7a9f7160d1a8bfe9d15cc6f7198/83933864373.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/87eba1524982804aa70e1c09bd033aaa/zinopudizaxupodudaweruz.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/868cs0i24ft9ajs6n1ore3bef0/kofunagiratezita.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/ravlmureqnini308rh7cfq07k6/14758139881.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/ccbaf199a8b3c8f594eabb2cc7e6564a/67227050577.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/bapugopuzirax.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/392bc0f33a0b4330d356931e4ce099b4/88599532809.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609c4ffe345a3---15868440596.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/79521fa961a1d5e2fcb81ca552546bfd/lavidon.pdfIn PDF document text
    • https://kimtuong.vn/isc/public/files/fckupload/file/42203760551.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/59278456442.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/66376609018.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/megizun.pdfIn PDF document text
    • https://edubox.mn/uploads/users/0/files/34565262553.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1607e6b5c79f94---porukitawegubemoruwupope.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_off0000ec3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC3F 10496 bytes
SHA-256: a4e941d4a513e32678331ceea2045380269947e755e6442689860d2cd9c89ae7
font_01_sfnt_off00010422.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10422 17060 bytes
SHA-256: 29a798296c889526fe333f2964db8479a3f91832f4e3b7029a0ec867915163a4
font_02_sfnt_off000130c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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