Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddfd2d1a7f24fbd1…

MALICIOUS

PDF

84.4 KB Created: 2021-07-18 06:49:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 081fd9a0063d2d062545bd28ccf1ffad SHA-1: 71e7646747dc39889df1f589cc67f2a2e4e978d4 SHA-256: ddfd2d1a7f24fbd1bd112c142ca47ef38e0078e24a8d54a1c6b1d7d37b339b77
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to compromised WordPress sites and other disposable hosting, suggesting it's designed to redirect users to malicious content. The presence of embedded URLs and the 'SE_INVOICE_LURE' heuristic indicate a phishing attempt, likely to trick users into downloading further malware or divulging sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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.retorika-zidar.si/ckfinder/ckeditor_uploaded_files/files/13487767835.pdf In PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/f966882de061f191590a8ce2f23b91cf/31899824590.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/10ed426d390b034700ac819de4b049d2/duvepoludogafogoruwamawo.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/xeperabenepibot.pdfIn PDF document text
    • http://tcsm62.org/uploads/news/file/68616075389.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ac4d27aba5c---vogesarekofakoweg.pdfIn PDF document text
    • http://bougerpourstarlight.org/clients/c/c6/c668404594a1c08d975ab50c7bec58f6/File/xugorarefedepakuv.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/4abf8b9c9437e3e71c3929386fe539c5/seluwaravuzepami.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ab772c85476---66635298483.pdfIn PDF document text
    • http://ewtch.com/upload/files/bukaxokolelavegotovotefu.pdfIn PDF document text
    • http://xn----7sbakif2a3azdub.xn--p1ai/admin/ckfinder/userfiles/files/76273289523.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/likebubezuwa.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/9mmthridu9rsg8elaejd63sbco/22419233377.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/xagusekixuzavadofuka.pdfIn PDF document text
    • http://pttaccounting.com/userfiles/files/sugowewokadewixujazosod.pdfIn PDF document text
    • https://tauthuy.vn/upload/files/sujodokigefodefopofupo.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad6413bd01a---migiso.pdfIn PDF document text
    • http://debschoen.com/userfiles/file/zekanuzevibolekuwo.pdfIn PDF document text
    • https://digireg.cn/upload/tuwijedebupulupiromovibe.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/vibakugesafim.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/bowoli.pdfIn PDF document text
    • https://gw21.ch/uploads/userfiles/file/tinuwebusoxezudu.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb272a58748---71832159025.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d09578bd8c---21409982726.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/b3d1e18092a9cda0613dac24a134543a/juwifopamudawove.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=irs+form+8965+instructions+2019PDF 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_off0000e6a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A6 11180 bytes
SHA-256: 3c7beadc7f966f420e715883883c2ec0141ea9171bbefc45b1754d83f4ec473a
font_01_sfnt_off000100d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000118e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118E5 16680 bytes
SHA-256: f46c7f21af622004a160fcebbdc36a31fe040b9da5e9bad6a2102adcd72efce6

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