Malicious PDF — malware analysis report

Static analysis result for SHA-256 492536de24f800da…

MALICIOUS

PDF

102.1 KB Created: 2021-07-08 02:10:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 66c70fd14333322c2bfa568efca15b24 SHA-1: 21df08a8ec43da04c38feb6004407dd4f32c6ffa SHA-256: 492536de24f800da5043f906b7836d912d990711a737d873472d69984dff79cf
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, pointing to numerous URLs hosted on potentially compromised or disposable domains. The primary purpose appears to be redirecting users to external content, which could be malicious or used for SEO spam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9773

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://adepotcustom.com/UploadFiles/file/20210430151755156.pdf In PDF document text
    • https://mfdesign.hu/files/file/lafiwijedibol.pdfIn PDF document text
    • https://designclarf.it/file/jitekutitenupikofazope.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2be91becb---lisageteva.pdfIn PDF document text
    • http://romengo.com/ckfinder/userfiles/files/41612380344.pdfIn PDF document text
    • http://ondrejkocar.cz/img/file/sufojataxepipoviza.pdfIn PDF document text
    • http://greatnice.club/updatefiles/file/26575896909.pdfIn PDF document text
    • http://pphjako.pl/userfiles/file/85163731188.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aae624b3a6---gikatuliselapoluludabavok.pdfIn PDF document text
    • http://superplasticizer.cn/d/files/wevewatanog.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f384a7ecdb---94295595051.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608542342541d---sojilegaxapixagur.pdfIn PDF document text
    • http://web300k.com/upload/ck/files/85622187364.pdfIn PDF document text
    • http://fdscience.com/UPFILE/userfiles/files/17824537523.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/67186190879.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac626fd7dc7---51882579153.pdfIn PDF document text
    • https://bonafideonline.com.ar/wp-content/plugins/super-forms/uploads/php/files/dc8dfa35ef8e4b8e4a26599141d25fc8/bakub.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160aada2ee2f58---boladosof.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609d912c9b982---xevumeretuzevuv.pdfIn PDF document text
    • http://maschimaurizio.it/userfiles/files/vabewiwilisuwoxizo.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd3238f615---jevigewumomenes.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/8ec571de85b18724bce0f2627f9e3d56/48367705962.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609da7a9e33fb---25275136887.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/nowoge.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf1c103fc8a---zamidomasurotepe.pdfIn PDF document text
    • http://rbtyutj01.com/userfiles/files/nomakamejik.pdfIn PDF document text
    • http://dakhoanhanai.com/images/files/78809268978.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=warehouse+management+system+pdf+pptPDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012e5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E5D 11016 bytes
SHA-256: 57ddbe7dc1a2d3d0742891793552fedee391c250e0b0dc17b542bda6a39b7623
font_01_sfnt_off000147a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015fb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FB7 16900 bytes
SHA-256: fbab2c83b4ce219317752dd9d1e2688c4e3fe50fcc871ffab88348f9f0108322