Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa34775f1acd94a0…

MALICIOUS

PDF

83.0 KB Created: 2021-09-15 14:43:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e550904af27aa246a29dcbc6223f84bb SHA-1: 55904d97b0e028304010a085046092e78b7ec2d7 SHA-256: fa34775f1acd94a0783137287d9c36d647c1862d86ab32169487d42bcf8de478
196 Risk Score

Malware Insights

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

This PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'SE_BROWSER_INSTALL_LURE' indicates the document attempts to trick the user into installing a browser update or extension. While no scripts were directly extracted, the presence of numerous embedded URLs, many pointing to potentially compromised or disposable hosting, suggests a phishing or malware distribution scheme. The document's structure and embedded links align with common tactics for delivering secondary payloads or harvesting credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://marljivo.hr/userfiles/file/gotaloxefuwajawa.pdf In PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413b5511f40---pobowixovopavi.pdfIn PDF document text
    • http://mofrantech.com/userfiles/file/54426307498.pdfIn PDF document text
    • http://bijverhoeven.nl/uploads/files/83075492756.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/f96b0c47e89855b0959fb4c025fc00fe/xuxegutedosamap.pdfIn PDF document text
    • http://rafaelstore.ru/upload/files/sipod.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/vukabadore.pdfIn PDF document text
    • http://raegcafe.com/uploads/files/niselaw.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/fec92d2c01796bb18578b9ecae6034d1/29407817110.pdfIn PDF document text
    • http://raylutickenterprises.com/userfiles/files/69400440141.pdfIn PDF document text
    • http://xtra360.net/campannas/file/sadubuwuzesaripajak.pdfIn PDF document text
    • http://kuppersbusch.hu/userfiles/files/judoligujakuvabilasatal.pdfIn PDF document text
    • https://skvacations.com/userfiles/file/26045698523.pdfIn PDF document text
    • http://mrybalko.ru/files/ximenovoxeruw.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d35e476699---rurigumilapozogedejil.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/fevotiz.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/039238913314d0519ed393061e3599e3/76564541037.pdfIn PDF document text
    • http://savaksangida.com/resimler/files/zegikusitijudukirogexo.pdfIn PDF document text
    • https://www.eos.org.eg/ckfinder/userfiles/files/figupebuxavuvazukirepi.pdfIn PDF document text
    • http://dkkarsin.pl/img/upload/files/9035815647.pdfIn PDF document text
    • https://kaowei.tw/image/files/20210911_015554.pdfIn PDF document text
    • https://magicdiscoradio.com/userfiles/file/kowiwapupoxojavonukidulo.pdfIn PDF document text
    • http://axi-hohenstein.de/userfiles/file/guzevowiliweveziwe.pdfIn PDF document text
    • http://szkolaprzybranowo.pl/ckfinder/userfiles/files/nugejepujopumalob.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/kasozomuvinuxozepiwowaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=android+system+web+updatePDF 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_off0000dc8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A3 10928 bytes
SHA-256: e607b619d7e6d183361a20cec87cb8981c6f4ac0a357300457c8d9e17bbc255d
font_02_sfnt_off00010dd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD4 18328 bytes
SHA-256: d2bb9cbcfc1a9e975e8be9ce70ff0a0b5153b2191ab28b45145731ec172eabcc

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