Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cb9dfcf8348647e…

MALICIOUS

PDF

149.9 KB Created: 2021-07-29 22:38:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4f77dc03d5f088987210c019b5d7c43a SHA-1: fdaf1b5775eaabb35bc0ce6b70cc5784f4f85046 SHA-256: 8cb9dfcf8348647e1b52458e5497eeab4ea3d81f0c6f3331d55442acb99f162f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites or disposable hosting, forming a link farm. The embedded JavaScript likely facilitates the redirection to these phishing or malicious sites, aiming to deceive the user. The ClamAV detection and ML classifier strongly indicate malicious intent, consistent with a phishing or credential harvesting campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://chcial.ru/uplcv?utm_term=what+is+divine+revelation+mean
    • http://dreamcatcherltd.com/userfiles/file/4198330553.pdf
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/094727c341f2df2d745429acc5974fb8/5344813421.pdf
    • http://capitaloffice.pl/fotki/file/14589999026.pdf
    • http://panda-es.tokyo/yamituki-n/uploads/files/pelosigebosujupo.pdf
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16099165555aec---doxexofijugunukimor.pdf
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f7e995b2895---jesigavotuxatulupaf.pdf
    • http://oiseau-bleu-morzine.com/userfiles/file/8406857842.pdf
    • https://alakharia.com/public_html/userfiles/file/jedoporipelazexubebom.pdf
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/kecnjdnimp4jpeqqfc8acche52/98615542246.pdf
    • http://yuli-china.ru/d/files/kavufuzu.pdf
    • http://doktor-okonski.pl/uploadimg/file/zesolupixezamomojij.pdf
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/burivupufemevuwo.pdf
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/b66a35ih18jnb409ejkmglo38f/43001843532.pdf
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a585661258c---setemiralapulerikag.pdf
    • http://kiavysocina.cz/UserFiles/File/54237035005.pdf
    • http://sunarfactory.com/userfiles/files/fijamiboneji.pdf
    • http://szentimresiklos.hu/upload/file/14421068433.pdf
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160acf5dba5ac7---bisedozu.pdf
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160f48e147ae10---66890931327.pdf
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16077eb0078613---simoxojejefedevomadaboson.pdf
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c971b47b70a---ditewevomowipofumowu.pdf
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/af71764f8bd9adf1c0eed6898e4b00bb/sovakot.pdf
    • http://idolyokocho.com/js/ckfinder/userfiles/files/jevifikopolilebukonox.pdf
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a9c2a545f21---94237541358.pdf
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/3itmkv2261k5n13c0gfli5coi7/lubip.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_off0001ea4f.bin
d0f0361d088f604327e06e237de417610421961eb0b8296f1df2903a0f124f5e
pdf-font-stream PDF embedded font (sfnt) at offset 0x1EA4F 10572 bytes
font_01_sfnt_off0002023f.bin
3070b0841db9a6d5efe791f55b5257ec24c3ae04bc6de2bf4880931476a83ed1
pdf-font-stream PDF embedded font (sfnt) at offset 0x2023F 17652 bytes
font_02_sfnt_off0002302b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x2302B 16792 bytes