Malicious PDF — malware analysis report

Static analysis result for SHA-256 e784682d5baa23d9…

MALICIOUS

PDF

74.6 KB Created: 2021-09-06 11:36:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 19a220eb787d9c615a4f47ad98b3fcec SHA-1: 142ae3b889af13b7689de69aee6854aaeebbd565 SHA-256: e784682d5baa23d9b829ce315ed2bc9c01cdfe2450d27bfecb06041bf346ca50
164 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress upload directories, indicating a link farm used to host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely a phishing or malware distribution lure. Although no scripts were explicitly extracted, the structure and URL findings point to a pattern of hosting malicious files on compromised websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb04e71046---jatuxetujelamisolujip.pdf
    • https://equimat-cheval.fr/file/sobiketapezafe.pdf
    • http://targhevaticane.it/userfiles/files/54372201991.pdf
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/18f78ee5f7dcdf60d8b8b56c1a089f90/mimarajos.pdf
    • https://towa-aaa.jp/userfiles/file/30417817893.pdf
    • https://binarbaidservices.com/public_html/userfiles/file/40881943377.pdf
    • https://nakipoglugroup.com/upload/ckfinder/files/jegisudoribalof.pdf
    • http://kargiskola.ge/myadmin/ckeditor/ckfinder/userfiles/files/13755214276.pdf
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160786bd1f245d---wenivofuf.pdf
    • http://elliptical-trainers.ru/ckfinder/userfiles/files/90047586249.pdf
    • https://wasael.com/userfiles/file/61707530118.pdf
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/dae353d80c463e9d9c93c9d591810301/43133476709.pdf
    • http://unseretochter.com/images/file/53560356023.pdf
    • http://baocaosuhoatoc.com/luutru/files/negabasukefufimewo.pdf
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c10e31f68---sejezerimasojerajoxag.pdf
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16107cdcb42925---97014018238.pdf
    • http://romanakladatelstvi.cz/userfiles/file/ripuwetomawepin.pdf
    • http://bhs-class1957.com/clients/35434/File/57309268833.pdf
    • http://www.520amis.com/upload/files/56953753320.pdf
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a6986f4e78e---mewivekufazerasalo.pdf
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/4e2433a17074ab2ebcdb21afef8f4ac0/48983332728.pdf
    • https://accuratesearch.com/userfiles/file/xiral.pdf
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/1912bb7f161a7ab3a9f38aee5a232320/tenesed.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=libertango+piazzolla+pdf+violin
    • 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_off0000c024.bin
98118efbadc611287387784dfb5230c7a15979478df7cd296685e8f22a6b3ff9
pdf-font-stream PDF embedded font (sfnt) at offset 0xC024 10728 bytes
font_01_sfnt_off0000d87f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD87F 16792 bytes
font_02_sfnt_off0000f091.bin
c40e84f15ddd593546907d3f1f34c7de215d023b1502a7b5d4456ece002e33ad
pdf-font-stream PDF embedded font (sfnt) at offset 0xF091 17316 bytes