Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf4fd0d9eb936857…

MALICIOUS

PDF

89.1 KB Created: 2021-06-28 20:36:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 76ac116541a27e2d5a16431f008dde9f SHA-1: 26aecde3b952324d75b586f27627f2bf9df3c83b SHA-256: bf4fd0d9eb936857b26893c725d3617ce3480d0ff9eb4ccd54ae4b8af597a7c4
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal a link farm pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs likely lead to further stages of the attack, such as downloading additional payloads or redirecting to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9765

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://laborke.ru/uplcv?utm_term=mnemonic+for+sin+cos+tan
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/8901cedd3f24447977b8655148da30a9/sabuludafuxu.pdf
    • http://tingyi-bnb.com/CKEdit/upload/files/59777229938.pdf
    • http://childconnect.com/swi/fckfiles//file/59782230378.pdf
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160814b74b7fae---26888926191.pdf
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/1ecffc370971459bb9b5ad4331f8ad61/vagibufux.pdf
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16070ecb8c9be5---79190941480.pdf
    • http://taborcapitalpayment.com/clients/d/d0/d0a3925ee25d0adc8806453b18bccccc/File/godumabobajur.pdf
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/62a89c08311d594f2c7cdc008a30892b/gemapegikijopameli.pdf
    • http://princeworldwide.com/multimedia/userfiles/file/palifetikamopigejexezeru.pdf
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/a5bmev3ldkvsb13ia8q7p69v3f/27355354038.pdf
    • http://donateagift.eu/userfiles/file/459396098.pdf
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608b63c76a21c---12978761371.pdf
    • http://dioceseofniranam.org/userfiles/file/jedopereborawepagikukowo.pdf
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7df7956d7---tojexomizer.pdf
    • http://meteosputnik.ru/userfiles/file/jogujiboxorow.pdf
    • http://urbanconstructions.org/images/uploadedimages/file/bobuzufanoditiwimijonewo.pdf
    • http://apluskleaning.com/admin/images/file/8690296298.pdf
    • http://ekolojikweb.net/upld/userfiles/file/zaxuxe.pdf
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607206c1c215f---27446095823.pdf
    • http://dianacb.cz/userfiles/file/bipepewotemilega.pdf
    • https://ivanda-commerce.hr/userfiles/file/91008873315.pdf
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/2b2902bfa5d3d911adbfb2bf8ac0235f/11048455710.pdf
    • https://transmar.biz/ckfinder/userfiles/files/90572867898.pdf
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160cccf86933a5---rasoripinaganuzigeve.pdf
    • http://houselandia.ru/files/fudasadagafenuka.pdf
    • https://gea99.com/ckfinder/userfiles/files/11249676401.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed11.bin
dca15097e229e7cb1b522ffab009b45179f03c2f2346f5e8938ecff1674e0059		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED11 2248 bytes
font_01_sfnt_off0000f70c.bin
5d5d477e6334f1c6701afc6681fd74855fa8c8963897842c11ee2a228c47ef23		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF70C 18160 bytes
font_02_sfnt_off000126ed.bin
03d2b2ad7c407e94665d05053f11f4445a0da8e5e18395126887d5b72dee02ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x126ED 10444 bytes
font_03_sfnt_off00013ea1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13EA1 16792 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.