Malicious PDF — malware analysis report

Static analysis result for SHA-256 d657056619e6fc1f…

MALICIOUS

PDF

78.8 KB Created: 2021-06-12 13:31:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 507f2067fc4445b9c907d102a684f609 SHA-1: b386e7116fffd3228f33a59219a2d0e5f13d2a71 SHA-256: d657056619e6fc1fddfd125f9745fa02c278bc4e95b641de832be0d1e6dda43e
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to various domains, many of which appear to be compromised WordPress sites used for hosting malicious PDFs. The embedded URLs suggest an attempt to trick users into downloading applications or other content, likely for phishing or malware distribution.

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://huntic.ru/uplcv?utm_term=inshot+video+editor+apk+download PDF link annotation
    • http://davidlbrooks.com/clients/868292/File/gezijizigedev.pdfIn PDF document text
    • http://edgecs.net/documents/37102143296.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16076a3f74c9f1---18409449215.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160865a4913535---vagutuxunesetagapup.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/2b112f57401c016128b54e2577e2280a/28257936863.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606e793b99d5d---72596915396.pdfIn PDF document text
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f66c0c03bc---7183147743.pdfIn PDF document text
    • http://soles2walk.cz/data/file/21194955851.pdfIn PDF document text
    • https://argumentua.com/i/file/perupigozodametunone.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/64754335215.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5face70c5---panojarexuwax.pdfIn PDF document text
    • http://aodaibooking.com/FileData/ckfinder/files/20210602_0FE75D7EB1A051CF.pdfIn PDF document text
    • http://grupopiscis.com/upload/files/nosafi.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/b5b890ad1beeffc34d7124761d3a3b79/76863873078.pdfIn PDF document text
    • https://radmangroup-ye.com/rgfiles/file/52195931177.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a06ba1847a4---2333800360.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a9bde8a67da---14144379195.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a810bbcbfd6---64582613813.pdfIn PDF document text
    • http://10glazsikeyrosa.ru/file/13740665997.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f621.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF621 5200 bytes
SHA-256: 919e031788480c856707a379a4ed1eedec7dd86f58aa3a93f28e2367534e6277
font_01_sfnt_off000107db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107DB 10636 bytes
SHA-256: 34d2a4660a4256abd948aa8a6074ab2cba0ced42bce366a226a62ea5ed6d05db