Malicious PDF — malware analysis report

Static analysis result for SHA-256 d90326a9a8717ee7…

MALICIOUS

PDF

77.5 KB Created: 2021-09-13 05:33:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d8e41fc72fc875da685665eec9954912 SHA-1: 2dae021737aa8ddc4be51e15dae7727f87e3567c SHA-256: d90326a9a8717ee76508127bb87cb277429f897f67757b2beebe05aecd67e48b
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple unknown URLs, with several heuristics indicating it's a link farm on disposable hosting and potentially compromised CMS uploads. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/1a3521eb07074ba7fa4868f91f91df64/34895356196.pdf In PDF document text
    • http://syarmarka.ru/userfiles/files/lodikuweronirexufojuxofep.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e8ebc40267---tubozenilunidawewujav.pdfIn PDF document text
    • http://cambresisemploi.fr/ckfinder/userfiles/files/98263980267.pdfIn PDF document text
    • http://weilandvloeren.nl/fckimages/bukorulugiri.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1613e9185a6901---92653091266.pdfIn PDF document text
    • https://sanruouvang.net/images/uploaded/file/62067302004.pdfIn PDF document text
    • https://ostrichpharmaceuticals.com/userfiles/file/jejidadaritaredadi.pdfIn PDF document text
    • https://suavitinhtannha.net/upload/files/87255834345.pdfIn PDF document text
    • http://erdenetpost.mn/userfiles/files/kugulagijuvigeritexelit.pdfIn PDF document text
    • http://360global.ca/userfiles/file/15152707385.pdfIn PDF document text
    • https://www.koreayokogawa.com/ckfinder/userfiles/files/16536608753.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/161386594b9e31---30013348671.pdfIn PDF document text
    • https://europartner2.pl/uploads/juwafuzilojiturejolesa.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/dvbp76g2398lsgq4qtn33gujs1/60961607193.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613a68ca18e55---jawul.pdfIn PDF document text
    • http://fermobkorea.com/userfiles/file/20210911134525.pdfIn PDF document text
    • http://uptownfallschurch.com/uploads/files/74189000451.pdfIn PDF document text
    • https://luatsubienhoa.com/upload/ck/files/riwegavebufedaliwo.pdfIn PDF document text
    • http://www.uc-kushiro.net/images/library/File/xosuwa.pdfIn PDF document text
    • http://beta-rc.com/upload/files/velelebogavuxuzo.pdfIn PDF document text
    • https://hunde-katzen.at/soubory/70910739158.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=patapon+psp+romPDF 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_off0000c624.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC624 19960 bytes
SHA-256: a838ded6b9372f07aeb32c83542289cd716270eda52c79f28f00d32935a5769a
font_01_sfnt_off0000f8ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000110c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110C4 10144 bytes
SHA-256: a0fec2818bd47ba1d5c354385375b926f2138cadbec8d31d79c632f9b2d2d322

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