Malicious PDF — malware analysis report

Static analysis result for SHA-256 358dd8d1c67955f1…

MALICIOUS

PDF

84.0 KB Created: 2021-09-01 07:05:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: ae7b613026eda181cdcc672fbb341372 SHA-1: 47653d0f5705ccb514efcec67ed2e6dd730b3ff6 SHA-256: 358dd8d1c67955f1b882f0c09aedc1285501262b784b8b8cf53a7665d736093c
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6cf1fb7e7e---fafutejesikugonizaraditok.pdf In PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/fk7fp34ekv3hfo5ejr9g5o3fhl/zozefifewebexubasepagubep.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/212b79f532a9fcad49f638d452f93c94/lovuwavurafidudefowawuliz.pdfIn PDF document text
    • https://nhachoxebus.com/upload/fck/file/84863542239.pdfIn PDF document text
    • https://podereilmontaleo.it/writable/public/userfiles/file/63654721818.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/gc9frnd642vq8jvf7ao17eo9p2/75955987233.pdfIn PDF document text
    • https://turkihale.com/userfiles/file/zumukijuluvifitegavejav.pdfIn PDF document text
    • https://ajur.rest/uploads/userfiles/file/rebukazinazabapepunofanat.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f858bdf024---1228849130.pdfIn PDF document text
    • http://severstroysnab.ru/userfiles/file/nidovomivazopavujajosizaw.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/fmhirembcq5mtkqm53e66btd7v/vijugugitegub.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/2322dad889899b174b3c80ff1e80684c/69569581867.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f936c59914---jozutisojelujuzetulota.pdfIn PDF document text
    • https://olivierdaulte.com/ckfinder/userfiles/files/wazaziwafaz.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982c0e466a5---11629991168.pdfIn PDF document text
    • https://xpress2.eu/ckfinder/userfiles/files/vaverikum.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/d478f1fe1a316db2db3db68cb317f4e1/somusizipokemopikasu.pdfIn PDF document text
    • http://yishiweb.com/upfiles/files/20210529_144324.pdfIn PDF document text
    • http://telekommarketing.com/firme_data/files/8243842333.pdfIn PDF document text
    • http://firegallery.ru/img/upload/gejupewumunipapopetawimom.pdfIn PDF document text
    • http://senseoftourism.dk/userfiles/file/ziwufe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+mix+light+purple+paintPDF 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_off0000e32f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE32F 10812 bytes
SHA-256: d532d6e6964ee21b74ff96c9e5d3f0e3483c03d401176c05eb2988218e3f5afa
font_01_sfnt_off0000fbea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBEA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000113fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113FC 17936 bytes
SHA-256: 3357196282abbd5184c4b82b9a549b533cf5606cab244f6e5144f91629765da3

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