Malicious PDF — malware analysis report

Static analysis result for SHA-256 b36b5970ed052656…

MALICIOUS

PDF

69.3 KB Created: 2021-09-27 21:23:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c6d24fe3773749fc805f6d502102e282 SHA-1: 267e0ebd7c00a67abc8c6d696b248046f1c403c4 SHA-256: b36b5970ed052656dc3e918957f1e3c045a1bda69a609bd08899732ff12bbdb8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document, potentially leveraging embedded JavaScript for redirection or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://laborke.ru/uplcv?utm_term=mobdro+tv+windows PDF link annotation
    • http://klusjesindex.nl/images/uploads/boxevafo.pdfIn PDF document text
    • http://hzbmsj.net/images/upload/File/22574477146.pdfIn PDF document text
    • https://people11people.com/uploads/File/80187503407.pdfIn PDF document text
    • https://bursakaynak.net/userfiles/file/9222235960.pdfIn PDF document text
    • http://xz-brand.com/ckfinder/userfiles/files/mokofikutexarokevasix.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614591dc99056---42988334118.pdfIn PDF document text
    • http://lightofislamonair.org/uploads/files/16113069650.pdfIn PDF document text
    • https://dentalrud.com/userfiles/file/87876945323.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/66867938727.pdfIn PDF document text
    • http://healthywithhart.com/res/file/6022985805.pdfIn PDF document text
    • http://jarosi.hu/files/file/60969559920.pdfIn PDF document text
    • https://hirurgija.me/files/xazabobewixado.pdfIn PDF document text
    • http://appartenvue.net/appart/upload/images/60967141499.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/f3e2ibft5uvdubn72gmtsuntpd/41086192276.pdfIn PDF document text
    • http://dsagco.com/Upload/file/zaxuga.pdfIn PDF document text
    • http://netart.hu/userfiles/file/30463116996.pdfIn PDF document text
    • http://52963566.com/upload/file/202109122147269926.pdfIn PDF document text
    • http://mofrantech.com/userfiles/file/dovoda.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1614cdeab0a41c---vijopez.pdfIn PDF document text
    • https://bursaphotofest.org/uploads/files/kopanesenaravurazaju.pdfIn PDF document text
    • http://azinsaghf.com/cache/fck_files/file/runeziwirowijelu.pdfIn PDF document text
    • http://rheinmotel.com/userfiles/file/40343468578.pdfIn PDF document text
    • http://spy-military-labs.com/userfiles/file/48388556184.pdfIn PDF document text
    • https://sooryasales.com/uploads/file/39862236376.pdfIn PDF document text
    • https://lapdonline.org/file/patewakugizoduga.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_off0000af84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF84 10184 bytes
SHA-256: 32519477dfdaa375bdf5bfe8463a126d8f52f6843437462a11713d2fbc2a5161
font_01_sfnt_off0000c677.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC677 15824 bytes
SHA-256: 0becd546352a52c508aece7a458de13db05696457aca370bafcecaecd415c0b2
font_02_sfnt_off0000ee77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1