Malicious PDF — malware analysis report

Static analysis result for SHA-256 56fa6701bf985751…

MALICIOUS

PDF

83.0 KB Created: 2021-08-25 14:48:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: cd3036f7c26f56551ae5c8b4bba58dc4 SHA-1: c6f1b84b59d07e6b5412e36ed89fd4e4f76f3688 SHA-256: 56fa6701bf9857519c7cfd374d83cef2bf3c66b30ec1c0a68d119d94b5d443f0
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the overall structure indicate a phishing or malware distribution attempt, likely leveraging the PDF format to disguise malicious content. No scripts were extracted, but the PDF's nature strongly suggests it's part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://laborke.ru/uplcv?utm_term=marble+floor+grinding+services PDF link annotation
    • http://hoshitorionline.com/uploads/files/wigelalijo.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/c4248308567bf6829859ec6e14b10df1/33906388441.pdfIn PDF document text
    • http://shriadinathbank.com/uploads/nunojizipuwupan.pdfIn PDF document text
    • http://izumrud38.com/ckfinder/userfiles/files/1335926429.pdfIn PDF document text
    • http://udelimpa.es/ckfinder/userfiles/files/posesep.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1efee12e1---menorafewotuvakemopa.pdfIn PDF document text
    • https://myphambambi.com/webroot/img/files/letudubamix.pdfIn PDF document text
    • http://bkdesign.ee/userfiles/file/disoxagakan.pdfIn PDF document text
    • https://soroptimist.be/oldsite/intranet/ckeditor/ckfinder/userfiles/images//files/51523209766.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c4b885df00c---28227004503.pdfIn PDF document text
    • https://luatsuavina.com/userfiles/file/tanuvegeseli.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160acf9d8ef5e8---litekenalerepisijigib.pdfIn PDF document text
    • http://solartgaleria.hu/images/file/rizalifosemozaxapex.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/bao64ku47tapvj6bo2u3d2l5dn/70039899626.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/88142463596.pdfIn PDF document text
    • http://glastergroup.ru/userfiles/file/71042697042.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609066f621911---58132172985.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6269b13444bea5395d66936a83ed3634/75530709603.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/37604626901.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/80054921131.pdfIn PDF document text
    • http://kabaretyimpresariat.pl/Upload/file/gosipinago.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b9ed126db60---rixuke.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/d75eaaa12e33f5c9133c0c9fd37a9005/41984873866.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7799a3ac80---84093604977.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dbb1438f070---66107624433.pdfIn PDF document text
    • http://cafehinglung.com/uploads/files/vofafururajofereridis.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_off0000e09c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE09C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B3 10752 bytes
SHA-256: b7939ab4044530c7cab4099b8ed484e2d1af5ef8cb744b381df714a634fb41d4
font_02_sfnt_off00011157.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11157 17176 bytes
SHA-256: fe6d379099842681ad408d8cfe4b65307ea71ce80338f3eb6f441f7c70bbb1e4

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