Malicious PDF — malware analysis report

Static analysis result for SHA-256 402f61e80464cdb0…

MALICIOUS

PDF

69.0 KB Created: 2021-10-02 20:29:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: a2e932f250e34e4695c0dfb4ccc33eaa SHA-1: a435c42c7d1c76dbc47454782053bd889e4f63fb SHA-256: 402f61e80464cdb0b5ec85effbf287c2e034d13de058301a5090877e5388eb0a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, indicating it's likely a phishing or malware delivery mechanism. It contains numerous links to external domains, many of which appear to be compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristic strongly suggest the intent is to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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 https://laborke.ru/uplcv?utm_term=force+tame+ark+pc PDF link annotation
    • http://moscowballet.ru/userfiles/file/fupovexuderunab.pdfIn PDF document text
    • http://biosystech.com/pdsFck/file/subuxavonopifa.pdfIn PDF document text
    • http://www.bash.cl/media/file/99750679197.pdfIn PDF document text
    • http://novo-foto.ru/ckfinder/userfiles/files/1379774565.pdfIn PDF document text
    • https://habibitours.net/ckfinder/userfiles/files/gowugisijutu.pdfIn PDF document text
    • http://progettocecinacuore.it/writable/public/userfiles/file/mapobegipizowazotube.pdfIn PDF document text
    • http://hotelamadeustorino.com/userfiles/files/97732882979.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1615703ae63ea2---3816372913.pdfIn PDF document text
    • https://www.kindspring.org/inc/ckfinder/userfiles/files/fajidepega.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/56k0nh8v6aj20m509qjl0qjic0/woxisuge.pdfIn PDF document text
    • http://jandebruijn.com/uploadimages/files/mifugurefogixiwi.pdfIn PDF document text
    • http://awarelaxcentrum.cz/user_files/file/73088019398.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613be94e2a5d7---niwaroxitig.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/pebum.pdfIn PDF document text
    • https://aademvegabaja.org/images/image/gofedilalamod.pdfIn PDF document text
    • http://annabarons.lv/files/files/fenomobosapeloninulodewe.pdfIn PDF document text
    • https://global-product.org/CKEdit/upload/files/jakofixewixasu.pdfIn PDF document text
    • http://jd6618.com/jd6618/file/2021-9/file/LwpCms2021_09_01_19_57_30_2681.pdfIn PDF document text
    • https://sieuthigo.vn/upload/ck/files/12332082728.pdfIn PDF document text
    • http://coolbiotech.com/upload/files/29973930802.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/mcpd8luel1bcd3k191t48j0ki4/24206333396.pdfIn PDF document text
    • https://aporpeter.ro/userfiles/file/79874621924.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/1614438c4a7c6d---63029364340.pdfIn PDF document text
    • https://triptoboloyfoundation.org/editorsfiles/files/vuxilojim.pdfIn PDF document text
    • http://hsound.ro/images/custom/file/21463187594.pdfIn PDF document text
    • http://longarmquiltingacadamy.com/fckeditor/userfiles/file/pamawezezojaxiwa.pdfIn PDF document text
    • 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_off0000b28c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB28C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000caa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAA3 10196 bytes
SHA-256: 95271776858fe9590e27ae521d03954a11cbf8f754ad68e7d6bf96c94e43c30f
font_02_sfnt_off0000e185.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE185 14764 bytes
SHA-256: 976e633fcbb77e621d49d191f61eff258d6fb80dde9af8fb57dca79fc8992156

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