Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a87cf445f9284c8…

MALICIOUS

PDF

76.3 KB Created: 2021-06-17 13:07:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9bbbb9967e8ce6e9fae5bc7d80c0b493 SHA-1: d08baf0ea1a5de064b26826245fb1472f27501aa SHA-256: 6a87cf445f9284c82ea2b8c70f279905028f4e62871a3335f4cbe808908badd0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for Pdf.Phishing.Trojan. The numerous external URIs and link farm indicators suggest the document's primary purpose is to redirect users to compromised websites, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with common phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://philabc.ru/uplcv?utm_term=telugu+balakrishna+mp3+songs
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/hndpsomj4fjcb9d15ejpipigr2/zasekufovur.pdf
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/007aca7c87f46087f28b31655ae2d4dc/67912259567.pdf
    • https://diphong.com/uploads/witazaro.pdf
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f26c2e6239---lanobewegusedowasotexudum.pdf
    • http://interiorconsignments.com/media/file/vifuzovi.pdf
    • https://ikitellirezistans.com/upload/files/lolajolakelagajipiki.pdf
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160719c4b2ba47---58618735561.pdf
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/ad1cdef9608881c670d95bef6e59058d/fadawirime.pdf
    • http://orosweb.hu/ckfinder/userfiles/files/89105620268.pdf
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd32e6a0aa---wikusexe.pdf
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/effc7346d7fb4bfb34ec626d9df09951/49546306041.pdf
    • http://ankurgroups.com/userfiles/file/62300600481.pdf
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160c03e688fbdb---52266563181.pdf
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/f104caef4bc7faf44b3f8ccdd05190d2/nosajixodipaligavibef.pdf
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076fa5d08866---35132372863.pdf
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/pju63onoqg2pufu4ki6oc7e4fo/fumaligepawatatinoverisu.pdf
    • http://hanhthien.net/uploads/file/telisifojoze.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebfa.bin
59d6e325f41789296bdb6a63a084b0e44fc1bcae20a4137d2363c93a36f134b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBFA 5548 bytes
font_01_sfnt_off0000feb2.bin
48f3687227900c1cdb64b153e7e001d147e4c1e5b02c746aec25af4eaef2d311		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB2 10968 bytes

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