Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c8fadc8166b8634…

MALICIOUS

PDF

74.0 KB Created: 2021-07-20 17:42:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 76b1d1b83ed318b0ecfea950b968eb39 SHA-1: 29df760c276cf5c00b20eae332e90bc4faaed3aa SHA-256: 5c8fadc8166b8634f9d2d15d64ed53664b121a33dd8633fa16f0da2718e781e7
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, but the heuristic findings are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078a1fbb1af9---dazotatogixukexa.pdf
    • http://mamam.by/upload/File/file/30921526710.pdf
    • http://helderlive.nl/ckfinder/userfiles/files/puzusorise.pdf
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/b7938736c16b05b320702c70db70f886/34571532690.pdf
    • https://floresdeserrezuela.com/aym_image/files/visik.pdf
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/tg0l3j0e95mhe7kjfoks86o3li/ratimolo.pdf
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7337e5cc8e---52820153080.pdf
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/73573d6ad192af1126aa40caa69a686b/vofiwizelidiviga.pdf
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160e4db83638fc---vukokajuzarasodubukinife.pdf
    • https://pmeds.us/userfiles/file/62507067925.pdf
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8623d3acd---57704234049.pdf
    • http://akgikorea.com/file_upload/fck_upfile/file/10542891596.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/94030bcc45684fe29f392feb3d31b92d/bexelemuju.pdf
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b46bfa1bb9---19044671452.pdf
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/cedc7568a2b71b51b7562b9551b36239/65479564949.pdf
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160790c0c32b83---84306316086.pdf
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/lh21v2tad6o7j6eus9orn77qoo/narozupi.pdf
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/73875516083.pdf
    • https://www.gico.ge/ckfinder/userfiles/files/bipegilidixupoxekif.pdf
    • https://ajitcoatings.com/uploads/49772320133.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607476051d765---88878717452.pdf
    • http://geose.ru/userfiles/file/nuxozofopifowuzefe.pdf
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/eaaaf07911f2991005d4cc06c130f8b5/katelelinakikon.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=b737+technical+guide
    • 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_off0000c12a.bin
28d9b9701830422f45e5b22f403846018a732c1f28088b9e8c646123c6adce2f
pdf-font-stream PDF embedded font (sfnt) at offset 0xC12A 10636 bytes
font_01_sfnt_off0000d93f.bin
4d8596a9b0591fcf7d27b016a6201e55f84629017ce9cd7b727dff44af210969
pdf-font-stream PDF embedded font (sfnt) at offset 0xD93F 16332 bytes
font_02_sfnt_off0001038f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1038F 16792 bytes