Malicious PDF — malware analysis report

Static analysis result for SHA-256 d01b8250fe5cd419…

MALICIOUS

PDF

95.0 KB Created: 2021-07-14 03:34:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: eeef4f1184b79916b4c18b5399af50f1 SHA-1: dde44531eff9d61d847d0c26addcc48466a0d234 SHA-256: d01b8250fe5cd419ef327d05170d5cc53a15df849e827cb5f708812dd74646da
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links pointing to compromised WordPress sites and other domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9806

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://irlanc.ru/uplcv?utm_term=loose+connective+tissue+contains
    • http://kiavysocina.cz/UserFiles/File/75544291936.pdf
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607473bc257cc---19050758475.pdf
    • http://szao-spb.ru/images/news/file/25832866943.pdf
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f17e63370a---85657254985.pdf
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160960e62a4014---dupowijoxudukuvejoga.pdf
    • http://lohs69.com/clients/82366/File/jezukavodifufuralow.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4c1d1433e---zigedopobi.pdf
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606feb83d9233---97009775468.pdf
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160b84c4e4b2ab---91026621202.pdf
    • http://alnoorcity.com/userfiles/file/81216836105.pdf
    • http://asupuro.com/upload/save_image/files/99523825889.pdf
    • http://amdind.com/userfiles/file/jidoso.pdf
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160a40b2b0467a---gupenojofozuganuxusemeg.pdf
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1607878d7262f9---34352691052.pdf
    • http://hopkinshigh62.com/clients/7/77/7764523e397120ad9b09b1da26998858/File/97263179010.pdf
    • http://kme-kme.cz/files/file/lefixonudamubep.pdf
    • https://greenlakepaint.com/ckfinder/userfiles/files/laxure.pdf
    • http://modnyi-buket.ru/uploads/files/33916295273.pdf
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075df462ca52---50237978220.pdf
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a00fca93978---42327625135.pdf
    • https://leganordavigliana.it/uploads/file/54747883405.pdf
    • http://bio86.fr/fichiers/78770681427.pdf
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/b2e128e99a594b9974a3a899eae01379/sijase.pdf
    • https://salubrismd.com/wp-content/plugins/super-forms/uploads/php/files/22002f55664c110c02c0ddb938aa5b9b/84593590865.pdf
    • http://ozdesignhouse.com/app/webroot/uploads/files/zinaxibokunamujowenow.pdf
    • http://ahoba85.com/clients/2/26/26d353b61ac95a99d7df5001a3d58300/File/90959558488.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/d810223b388f5d79ec43628d2f9e4a71/gidiwasaw.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001139d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1139D 16792 bytes
font_01_sfnt_off00012baf.bin
e488e494229daf848b712621a7930fa61ff0775b79dabb8c215b5480f7320e80
pdf-font-stream PDF embedded font (sfnt) at offset 0x12BAF 16756 bytes
font_02_sfnt_off0001575b.bin
8752f58412cd7da54c6d51677028fac5ff329817f571b7a0d29dfd275c9c9edf
pdf-font-stream PDF embedded font (sfnt) at offset 0x1575B 10200 bytes