Malicious PDF — malware analysis report

Static analysis result for SHA-256 070ef741488e3dea…

MALICIOUS

PDF

86.2 KB Created: 2021-09-01 10:54:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 370424c70bbefa9198be9916de961049 SHA-1: 47192b2decc609982bb1f225d12a725b98958270 SHA-256: 070ef741488e3dea90e4a3ee499c643a22c0920329e12f4ca9dd5793d7da450e
156 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users. The document body is heavily obfuscated and unreadable, but the presence of external URIs and link farm indicators strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://de-ko-gmbh.com/ckfinder/userfiles/files/96694678859.pdf In PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/abe42c0f698f930333f4be66ec3af511/62068593190.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/fd631183fb1e4eb0b4bd7c7d5cc2d44a/65521047351.pdfIn PDF document text
    • http://duancanhotot.com/upload/files/pisemakividipa.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/p5h7duvqq8sujdfi8siu7su2n5/34428482440.pdfIn PDF document text
    • http://rallyteamwalraven.nl/file/sabuxujevewosunotupigawaf.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab2f8a3a764---witewefisufajapoxe.pdfIn PDF document text
    • http://brenderup.ro/mm/file/meguwutomotaxefaveguxixik.pdfIn PDF document text
    • http://aescantabria.es/upload/fckeditor/file///81761431859.pdfIn PDF document text
    • http://lso-msm.fr/userfiles/file/93822652652.pdfIn PDF document text
    • http://penzion-u-zamku.cz/files/file/74371600890.pdfIn PDF document text
    • http://agavietnam.com/img/files/divitanovamotituremip.pdfIn PDF document text
    • https://rhuyscampingcar.fr/images/files/43198370535.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/japikimamodudafe.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/ribujerisejozovegixopokud.pdfIn PDF document text
    • http://chouchoudauphongongtay.com/upload/ck/files/lanasukulejokivak.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/wezenobajixak.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/90826792097.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ca126d9f10c---rijokefupo.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c88a7916b3---63241914134.pdfIn PDF document text
    • http://cheapneasytrafficschool.com/CheapNEasyTrafficSchool/pa/trainstation/uploads/image/file/pomizajadezidapabesiwi.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160d2c52437711---85326154867.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608fd61947f4f---lewebiwegagotedupa.pdfIn PDF document text
    • http://laclonghotel.vn/upload/files/56911543520.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=hollywood+movie+download+isaiminiPDF 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_off0000ede1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000105f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105F8 10468 bytes
SHA-256: a883fdaa2d9f8391dd174a86052a526a977d30d9f48b61db3018e5dadfb1a9d9
font_02_sfnt_off00011db0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DB0 17476 bytes
SHA-256: f608e5112bcbade8f0686c37ee5c734876af97ee532342fd1b20a6f7d9043939