Malicious PDF — malware analysis report

Static analysis result for SHA-256 393b3a81ea303987…

MALICIOUS

PDF

82.3 KB Created: 2021-09-03 06:32:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: af6e01c0173322b8f5f1fab53293c9d2 SHA-1: 83d1730f1b4fab4d68a9ec25205890eab63ba4c0 SHA-256: 393b3a81ea303987df21efbc2da8290479182f46a43d14d9696b46a91a2df59b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS uploads and disposable hosting, indicative of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://yjbiotech.cn/upload/files/xalibuzalasivikerotimi.pdf In PDF document text
    • https://agmatbaa.com/upload/files/lerijixanuloxumuxuz.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160f53f97f09a7---kupisasuturapefiwewigeril.pdfIn PDF document text
    • https://deniz-sogutma.org/img/userfiles/file/60608477056.pdfIn PDF document text
    • http://color-gateway.com/userfiles/file/96946940723.pdfIn PDF document text
    • http://expertsystemgroup.com/file_media/file_image/file/79716401474.pdfIn PDF document text
    • http://palirna-frydek.cz/uploaded/file/2044247150.pdfIn PDF document text
    • http://webhenevents.com/clients/868374/File/selugosabirifupami.pdfIn PDF document text
    • https://aprenda-atdi.com/uploads/files/66174711722.pdfIn PDF document text
    • http://gemaeldeundobjekte.de/uploads/files/wogotenejaxufaxagejufego.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/2b93642edb1a3d095e0e31064ca07928/zexovuwazufotuzowipijovew.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/85866162119.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/it9lp6gun0b5p1igqd6fvqtkl3/74800699630.pdfIn PDF document text
    • http://antichigelsi.it/userfiles/files/82448974294.pdfIn PDF document text
    • https://vydavatelstvoklett.sk/userfiles/file/24081663965.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160764b0b2f597---68965935491.pdfIn PDF document text
    • http://imcborivali.org/userfiles/file/85726093684.pdfIn PDF document text
    • https://hbfilm.ca/resimler/files/javofaxerifez.pdfIn PDF document text
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/73ec1da3b550800e420aa8f185c66b74/90437188373.pdfIn PDF document text
    • http://talleresjpg.es/img/file/83339876595.pdfIn PDF document text
    • http://spostojow.pl/userfiles/file/popak.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/cca2fb2c367ac0b02b12e0b7fc7d68f5/85341962766.pdfIn PDF document text
    • http://kzlo.pl/fotki/fotki/file/konowemejov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=combine+two+pdf+files+in+foxitPDF 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_off0000dd75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD75 10756 bytes
SHA-256: 638e53b595461822959c3da68dee78c4a75638d14001a8d954d428b318ac2942
font_01_sfnt_off0000f607.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF607 18100 bytes
SHA-256: c17c753f56f786521b84224b771637824519bcdcf1613b5f2e95b9249e90613f
font_02_sfnt_off00012410.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12410 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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