Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a37b56318760e47…

MALICIOUS

PDF

86.3 KB Created: 2021-07-03 01:51:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: adbb839a24b7dd8c250036c6ceffd38e SHA-1: 7bff22fe960e410a0eb7f4bd3ae71f6bb85b03d2 SHA-256: 0a37b56318760e47d1a623c77238d65d8c63b7933775a0974a9417e73d34be53
156 Risk Score

Malware Insights

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

This PDF document was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various websites, including those hosted on compromised CMS platforms and disposable domains. The primary purpose appears to be directing users to potentially harmful content, such as phishing pages or malware download sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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=class+7+science+lesson+13+question+answer PDF link annotation
    • https://narimasu-chintai.net/jcfiles/file/nefegukipudifigazekive.pdfIn PDF document text
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/a503c65ce82f318c36528f3e071ccfc8/pejale.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607a93bfc4937---8249458699.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/q4bp5t0u2tq67adj9htjh09vqc/37373098904.pdfIn PDF document text
    • http://aite-materials.com/upfiles/file/89730303122.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/nixixiwidepaxonibojevok.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/cqis0f8nemf1804et55cl6rpm9/78154612084.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/45497895721.pdfIn PDF document text
    • http://indel.sk/userfiles/file/nobudubinapuwofasobuted.pdfIn PDF document text
    • http://businessvaluationapp.com//fck_files/file/kemowaja.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607855e2c1152---misudale.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608db835177db---rewadano.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/v4md8rimvg8kgmc3pn2ggkfhm5/zakugepexufawuz.pdfIn PDF document text
    • http://southeastern61.com/clients/0/07/0748cf78e2268043913ae7c14e09e996/File/kiluzoxuporaje.pdfIn PDF document text
    • http://oticonshop.net/ckfinder/userfiles/files/barudalaliduxuwuvuwid.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a2779901688---norerije.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/modaneko.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a96521d265f---lujusidijivujafobukusosi.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16094360d54db6---gefilolufaroxateginiw.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/984003b9312b0ff6a4def921663ab1b1/vonavawiw.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/43d075ab9b5c216ea4182beb6989f241/fexalaf.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/20b3d7cea820bfe943d1aba1294a69cc/tamabenexidase.pdfIn PDF document text
    • http://smflow.in/admin/uploads/file/tazivi.pdfIn PDF document text
    • https://umutisi.com/umut/upload/files/ketezoluxomivamatejozi.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_off0000ecbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECBC 10860 bytes
SHA-256: f7b16aa92d30cec862ceaa3779c06e33297b10b681065c323227bf3792a4144f
font_01_sfnt_off00010630.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10630 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E42 16764 bytes
SHA-256: edf63ffa66fb4f8068799da05481991bd42844016bf6bef211a203d5b73aac00