Malicious PDF — malware analysis report

Static analysis result for SHA-256 d636f8f6c48a85e7…

MALICIOUS

PDF

89.9 KB Created: 2021-08-03 00:25:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bee12d5c7874a4175ca6749151ae3c8f SHA-1: d7afb979231f975b1cbbc55fb6651d95bef2befe SHA-256: d636f8f6c48a85e7d5b1b8d3da4582b89376f1db363d57aa7a56080e997fdb87
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The document contains a link farm pointing to compromised WordPress upload storage, suggesting it's part of a phishing or scam campaign. The presence of embedded URLs and the callback lure heuristic indicate an attempt to trick the user into interacting with malicious links or making fraudulent calls.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609af55ce64c0---49598307291.pdf
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/a4bf34e2d67e787bc450ac4ad43a771e/remoxup.pdf
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606c825052efc---mafudunugaxim.pdf
    • https://study4student.com/cache/fck_files/file/60753525950.pdf
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/5nvmvkom3b5p82t7811m2hrquk/2833023070.pdf
    • http://ligonfamilyreunion.org/clients/9/9a/9a44987365eba454cd9b2deda39aa7c0/File/7552466034.pdf
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607cdd0987bf3---5754431284.pdf
    • http://firegallery.ru/img/upload/3165601765.pdf
    • http://clerus.hu/files/file/41072231711.pdf
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a43a970b14---digoj.pdf
    • https://anakaygame.com/calisma2/files/uploads/fawiwupajovugajeziz.pdf
    • http://akcjonariusz.com/UserFiles/file/73009500825.pdf
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095fbdb7d279---fajarenogomenoxewiber.pdf
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16080e608d10dd---xijutezogaxeduwuli.pdf
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/15682252826.pdf
    • https://hissekurban.com/resimler/files/80804017982.pdf
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095fb7e662d8---mokana.pdf
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f22410a6be7---xevax.pdf
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/309c20bd9374ddc2fd0709915e1fb400/39234805706.pdf
    • http://gptools.net/userfiles/file/xofalubaxadeno.pdf
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ba670eda3ea---84779118853.pdf
    • http://thermcom.cz/userfiles/file/39637166649.pdf
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/c5a663eba271fa8b5abc0a3a5cfacb85/jotikisezoguzuxubad.pdf
    • http://illinoislivestock.org/userfiles/file/74750994178.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=el+aleph+luis+borges+pdf
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6f9.bin
8f5a3c694f830d9d6be6d456d684a38f48a5dea0fad912c0692ee2c4acfc6c93
pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F9 18428 bytes
font_01_sfnt_off000126a2.bin
dc06b80eedff931fbc177a772dcbeb39e3fd0ea8d0414d249c95a7ac2fc9b319
pdf-font-stream PDF embedded font (sfnt) at offset 0x126A2 10796 bytes
font_02_sfnt_off00013f1c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13F1C 16792 bytes