Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf21b4c4b53b4a29…

MALICIOUS

PDF

90.1 KB Created: 2021-07-01 14:14:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ec36615731752ee60fef56ea5464ad47 SHA-1: 5b96db76e78b4f6ac0bb98875da10c3924775aed SHA-256: bf21b4c4b53b4a2941628d1a126f937c335d0b8d39c20475d8682ba7bea0661a
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites utilizing formcraft or super-forms plugins for file uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple links on disposable hosting and compromised CMS platforms suggests a broad-reaching campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://philabc.ru/uplcv?utm_term=multiple+intelligence+theory+in+the+classroom
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e5838f39d---pefasubebipenirolepute.pdf
    • http://energo-market.ru/sadm_files/10504157927.pdf
    • http://daiichilogistics.com/uploads/news_file/nikefawivexotib.pdf
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607d555260367---wulefufezoxo.pdf
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c5c76eb1b81---96972361791.pdf
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/dgs2a46e8jdtm94pout3io47uj/xutiwagiwugelajebazufi.pdf
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b0a6cf8ee---89393360065.pdf
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a378910f2a3---jutegitigelugesubatuxife.pdf
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607346ab8a4d4---manamarupidiz.pdf
    • https://autosaloncenter.com/uploads/file/81346023283.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/8f2dc192873e54d08ffc79678bdaa8a4/zigozijosew.pdf
    • http://landpas.pl/upload/file/22152186139.pdf
    • http://szwygs.com/upload/2258816815.pdf
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a5ab21937f---jotonevipisanewapotusa.pdf
    • http://dbjhockeytournament.com/clients/f/f9/f9ff496842c877cbb4522510b668f2a2/File/39501082373.pdf
    • http://gtshotel.it/images/file/37642119638.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16073e60f03c56---69470959943.pdf
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b866fbb342a---febufuvowuva.pdf
    • https://lastcallslc.com/wp-content/plugins/super-forms/uploads/php/files/dd5f794ec4a4db419d8844e6ff907e98/37215981707.pdf
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/wobevabupobelepolopumafor.pdf
    • http://charivne.info/images/file/likanek.pdf
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/5c1cf639e881e395299f1104a63e4d46/99247220250.pdf
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/fipgdjt5q36sji22g5lt2sf71j/32354739100.pdf
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/a24e302cece5581fe0b439a6cfe2a462/88588330664.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_off0000fbad.bin
50a21390000d4e669f5e6dd5c568477a46b35e874a9b19952cbc312ce815db19
pdf-font-stream PDF embedded font (sfnt) at offset 0xFBAD 17024 bytes
font_01_sfnt_off00012788.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12788 16792 bytes
font_02_sfnt_off00013f9f.bin
f1d7866d1ea22b537f53b2c560f4cc703071d4de416d1a581fdc2ec79ccff422
pdf-font-stream PDF embedded font (sfnt) at offset 0x13F9F 11028 bytes