Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bb30306e91d5d78…

MALICIOUS

PDF

77.1 KB Created: 2021-09-24 02:33:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c39bc13c77813f649d86e750f648b66c SHA-1: f066ec3efa0cd6520288166d434e8f64fad82963 SHA-256: 4bb30306e91d5d7898dc10a34564dfb898807dbe27f5d0c8e6f255a4bdf78741
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users. The presence of these links indicates an attempt to lead users to malicious sites, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/fb205fb3334a53fe7267c79097362a44/raxegorekedoxidot.pdf In PDF document text
    • http://ned.ru/uploads/files/33443186565.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/d2b335b0afce499c12b99dc29ca72e94/40002219293.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/181409097258.pdfIn PDF document text
    • https://brakos.it/file/85675878696.pdfIn PDF document text
    • https://efficientinfocomm.com/ckfinder/userfiles/files/12468320150.pdfIn PDF document text
    • http://samarthservice.com/userfiles/file/kajegavebutan.pdfIn PDF document text
    • http://sns-russia.ru/userfiles/file/mokamozomep.pdfIn PDF document text
    • https://ip-kamera-rendszer.hu/ckfinder/userfiles/files/rapesaxunovapitujurigigax.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/665forl6g19rf9uuqchchutgqn/1275808539.pdfIn PDF document text
    • http://basaritarim.net/admin/editor_resim/file/fuxuwi.pdfIn PDF document text
    • https://fminterativa.net/cms/plugins/ckfinder/userfiles/files/43931474264.pdfIn PDF document text
    • https://volandovia.it/public/fileeditor/file/sobinewuw.pdfIn PDF document text
    • https://mannoorpally.com/uploads/file/neniduwizowiruk.pdfIn PDF document text
    • http://3qbuy.com/CKEdit/upload/files/jupevaroduzek.pdfIn PDF document text
    • http://hoshitorionline.com/uploads/files/migetesupeki.pdfIn PDF document text
    • http://raczcsalad.hu/files/37513423339.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/27451031390.pdfIn PDF document text
    • http://podlahypilat.cz/admin/file/36043230617.pdfIn PDF document text
    • http://greenglobepms.com/uploads/77894937356.pdfIn PDF document text
    • http://nujhimachal.in/img/uploads/files/99339869742.pdfIn PDF document text
    • http://franklcalabreseattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nipazip.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/1614876cfeacf9---15936753669.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/050e56939aa70716b15911c74c4b81ea/suzodur.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139fc163fc73---45205992710.pdfIn PDF document text
    • http://krasneclanky.cz/uploads/kemuvupawoxat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=alexa+talking+appPDF 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_off0000c766.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC766 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF78 18512 bytes
SHA-256: 2804a73bfc88fb24bcddeacb1e419d9bb97a3478354e408315c5f471867afd2d
font_02_sfnt_off00010ff8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FF8 10212 bytes
SHA-256: d169bedc1eb7ea42e7a388d27923a9d29497329d1f5cb59866a50efddd57f6e8