Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9b0c4da86db4dd7…

MALICIOUS

PDF

96.3 KB Created: 2021-06-26 21:30:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: ad256dc1241ecbc25a6061304c095f5c SHA-1: 89cfc0f004b40c0e8a528132e7a524841a0f0f67 SHA-256: e9b0c4da86db4dd7c381322d63bd5b1b2b963ddbef971c41cb6c7c97353801a3
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to compromised WordPress upload directories. These links likely serve as a lure to download further malicious content or to phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

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://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/vjamnp86mvbqmc6bude2cv7js1/xawini.pdf In PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ada7cfaae5a---rapedobobazalu.pdfIn PDF document text
    • https://wisserarm.nl/app/webroot/files/userfiles/files/tozabepuxidibu.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/qlofmprlglclv99vf5nbkr08nj/dudekaxinilefadowamogejop.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/812c304ad09abbddb7aa87f8812b3a31/19221588068.pdfIn PDF document text
    • http://cropscipublisher.com/files/upfiles/file/63584887490.pdfIn PDF document text
    • http://vankouwenenmastop.nl/UserFiles/file/23671742881.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16072b71dc5438---11326834362.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce6a99b42e0---repipunijol.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a283a852de9---1723747083.pdfIn PDF document text
    • http://popnmusic.fr/userfiles/file/rewukugibofodede.pdfIn PDF document text
    • http://pokemom2.com/uploads/files/49654448136.pdfIn PDF document text
    • http://chinamakina.com/userfiles/file/41587997617.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/xojirasituratoranuwete.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/4485154140e3136ed2aa79f9581f582e/58935583544.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b324364bde2---7835031655.pdfIn PDF document text
    • https://aterhesseg.com/up_image/file/58607470666.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/4ml6hbufotodc273u78qm8r6km/xewoforulibamilumax.pdfIn PDF document text
    • https://kopari.hu/files/file/18023110253.pdfIn PDF document text
    • http://thanuyentea.com/ckfinder/userfiles/files/54858916081.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160ae06c1aa428---dufunovol.pdfIn PDF document text
    • http://bigandtallking.com/userfiles/file/84673778524.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/8f405fa73ee7dafc4eb287d0a66bdd1a/sekasegotazalu.pdfIn PDF document text
    • http://jevades.com/aircraft/fckimages/file/ridixivafipoxupoxozowuvi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=meaning+of+evadesPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0001559d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1559D 18108 bytes
SHA-256: dda236b9c855662f66474066f62c56596dffd7fd53cbcbe07b0a2f64328afe93
font_00_sfnt_off0000f4a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010cc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC0 10344 bytes
SHA-256: a3c30def0a6e91b506ebfebe7123f5305f2424e17a17ff01cf5a7e323d620803
font_02_sfnt_off00012405.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12405 19200 bytes
SHA-256: 7eabb287d70cee6d35037f00693b175eb62a659b524f1a6b20dac9fe3c7dcf20