Malicious PDF — malware analysis report

Static analysis result for SHA-256 b474e2071f3e34ce…

MALICIOUS

PDF

80.5 KB Created: 2021-06-22 19:31:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 69d33fff48926e8f7d6640a3565caac3 SHA-1: 3b8c9b747af25804ec19884148f87cdd09d0a53a SHA-256: b474e2071f3e34ce773bbe9111f492b733807d1104790b7dfbb073b3ec095d22
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple compromised websites and disposable hosting domains. The presence of numerous embedded URLs, many pointing to WordPress upload directories, suggests an attempt to distribute malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/5e91b348b6f8f6eef8a71ab965f293ec/23943206961.pdf In PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/n07j1ubacr9n9787m5o3q61d7u/15556492749.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/18028720997.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608881d04be42---13013188960.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/6fda9f05372116f3bb9d93a8d10b66a6/pisadafumumujipuwone.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/lp86e54i67r7clkihf70h6po7u/gebejesulafoxeduboze.pdfIn PDF document text
    • http://j-line.ca/fck_upload/file/setegakugedirejafijuwosov.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/b52hi27cmtiqnv1cqed5c4bjb3/56518865802.pdfIn PDF document text
    • http://thuephotocopytaihanoi.com/upload/files/13260756653.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/fe4f040c3e7a8e7776a8b68c0cd99245/firapodekaligojimuwide.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/t03ajumpqh600fp74a1k8n98j7/gegufirasevavejivud.pdfIn PDF document text
    • http://appartenvue.net/appart/upload/images/wozaker.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/22c0f6014c3caa14c5d7e21bf67d8d6e/piraluzenudata.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/d3a2a42cbb916767deb236e9df43e750/durafurububeruzofilemos.pdfIn PDF document text
    • http://4grd.com/cmsimages/file/wolikeda.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=legend+sidhu+moose+wala+djjohalPDF 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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00011894.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x11894 18048 bytes
SHA-256: 162dd84c0b7b3b26d206572010b599ea6ea659df9cde730641417c943df35f48
font_00_sfnt_off0000d370.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD370 3068 bytes
SHA-256: d81396996bab7258f5c80f0c375a8a5acfcfa5d1a02a29ac227fb86939da274a
font_01_sfnt_off0000de5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE5E 5252 bytes
SHA-256: f3912e28f47030195ae85f869a4af74db76add06b4c163e54f7b12a7d920a36a
font_02_sfnt_off0000f032.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF032 12324 bytes
SHA-256: 044bfbbc41ee4575ff9c22034880131b934419fa9bb28af66946bae235a74d09

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