Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3e34063d129bb4d…

MALICIOUS

PDF

84.4 KB Created: 2021-08-23 10:03:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 445bd48af2678a488b6559fbb5808a3e SHA-1: e7fd8f681f048bce30cf9bd245f5b94675296a70 SHA-256: c3e34063d129bb4dcd3106a8fa3a18604bb92f931e925de8a90ecb5de44b5dfc
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. The document functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, likely serving as a distribution point for further malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://wrhsclassof82.com/clients/d/dd/dd94ad2327da436b0bfbe5937c3cc641/File/54682681575.pdf In PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/4152d97b4f4a957044fc1e75e564c235/nalanowu.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/8fd018d6783135e49c23b66f3259cc62/16048165916.pdfIn PDF document text
    • http://szpital-sulecin.pl/images/fckfiles/file/28360539120.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/ae10fc936717d4b78b767d458fec3265/sedijofili.pdfIn PDF document text
    • http://nagymester.com/userfiles/file/modigudipilapavezuroxapi.pdfIn PDF document text
    • http://alliusie.com/userfiles/file/84884431373.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b2884cf3b1---11997894988.pdfIn PDF document text
    • https://beaszemin.com/files/66467428398.pdfIn PDF document text
    • http://st-ark.it/userfiles/files/dosadororokuxikof.pdfIn PDF document text
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/bc72560b0cf6670839fe9cb6bb1e7350/5706449797.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b44901988c---24333967804.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607015a60bd11---najisevadi.pdfIn PDF document text
    • http://sgpeo.pl/users//file/fenupunobizeduvagatudu.pdfIn PDF document text
    • https://autoroman-service.ro/imagini_ws/xesetotamukipej.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c46e2cdcc89---ginufaralijitudewaba.pdfIn PDF document text
    • http://hotelclinton.it/userfiles/files/ladojuderofexeseb.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/0063c0afeed0744522f0538e630da596/vorupuwefibewiwo.pdfIn PDF document text
    • http://vividconcept.in/userfiles/file/76851415794.pdfIn PDF document text
    • https://binarbaidtrading.com/public_html/userfiles/file/17190893329.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/32cf4c3d53c080977c600ace33d5d3e9/54791230209.pdfIn PDF document text
    • http://mevlanaasm.com/resimler/files/61914328731.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=download+freebeats+2020PDF link annotation
    • http://perfecturology.cafe24.com/upload/editor/imagefile/bamovuris.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_off0000e597.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE597 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fda9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA9 16988 bytes
SHA-256: fd57a656b0134adf433c2c059342aff6094fc4d1f06213248288fbed10ca079c
font_02_sfnt_off00012a32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A32 10724 bytes
SHA-256: 0b20bc670fe8ba8f323e6871f17baa57e8b32b9540061a7a11f485ffb6117da2

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