Malicious PDF — malware analysis report

Static analysis result for SHA-256 a21b303a5949d7be…

MALICIOUS

PDF

82.4 KB Created: 2021-06-30 14:50:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 247639eed69c5baaaca5614cc0ac1279 SHA-1: bb07e3748d22cb40e9c103562a90274a9b24bbd7 SHA-256: a21b303a5949d7beefd4be3dc478a8b661a19dbdee728edf5c4fc2b8eaf18e5e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious. It contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to potentially harmful content. The presence of these links suggests an attempt to lure users to external malicious resources, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9921

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://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609a86db7bdd8---jesok.pdf
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c197cea1b2---40125473812.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160759cc4cdd7f---55186503608.pdf
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16085dc24dee9a---75855906638.pdf
    • http://clinicaveterinariagoitese.it/userfiles/files/79140401528.pdf
    • http://phdpecs.hu/userfiles/files/82674586098.pdf
    • http://loscogliodifavignana.it/userfiles/files/gezewalilemomebotosukape.pdf
    • http://carszana.com/image/upload/File/80446339205.pdf
    • http://poltinik.ru/userfiles/file/43861118551.pdf
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/e27931e75e2be7cc28a628c489c9dab2/naxizajelapedeleko.pdf
    • http://konditsionery-reutov.ru/upload_picture/file/8826109437.pdf
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a32e87f2e71---90502928579.pdf
    • http://embeddedhr.com/ckfinder/userfiles/files/96128513055.pdf
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160893e1cb5687---60913767532.pdf
    • http://tfh-filter.hu/_user/file/pijikopitasobutexusova.pdf
    • https://rockyshairsalon.com/wp-content/plugins/super-forms/uploads/php/files/90d4lpihc8dh5tubgk72i2bufk/89292543154.pdf
    • http://axwelindia.com/uploads/fexudopidipavixi.pdf
    • http://alacarte-design.de/userfiles/file/90161055397.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/pv4537fmvh3vh8t8t4u33a0o06/tapasebowiwajidukokenexe.pdf
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/e0a44343669cebf96045ad10ce4b1208/nanimegodinazimopi.pdf
    • http://yoron.net/up/files/mopugedutiwusefe.pdf
    • http://mmdplus.com/userfiles/files/20210610_150521.pdf
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/ddeevk8q3pm55h1i8qqua539l9/tabiretoxipawufudo.pdf
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16099f54a5befc---70883299703.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=manswers+full+episodes+free+online
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0001207d.bin
473fe15293c9740c995fda91c8f2a26f4aea0edccba0e44636bbd7060243e4fe
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1207D 17876 bytes
font_00_sfnt_off0000bffc.bin
902958b43aec5d2bbdbdfd6667b18ad4343007a8e28a85cafce6683f7e3fa90d
pdf-font-stream PDF embedded font (sfnt) at offset 0xBFFC 18072 bytes
font_01_sfnt_off0000f02d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF02D 16792 bytes
font_02_sfnt_off00010844.bin
568a760649667c08428da235fd69c8de8db807b95c991a17da0c06b97a6a5c4a
pdf-font-stream PDF embedded font (sfnt) at offset 0x10844 10572 bytes