Malicious PDF — malware analysis report

Static analysis result for SHA-256 d369f5b2bc40e234…

MALICIOUS

PDF

82.7 KB Created: 2021-08-17 19:00:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a7cd76f6574485435fc650696efb9076 SHA-1: 1d9d075b54781ebf99f827372a273a8a0c326360 SHA-256: d369f5b2bc40e2348f8ae71032997393a07a95860802934267ca4ee930b80750
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, pointing to numerous external URLs, some hosted on compromised CMS uploads or disposable hosting. The primary attack pattern involves directing users to these external sites, which likely host phishing content or further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://vishwkarmaenterprises.com/webroot/img/userfiles/files/kezugosobosod.pdf
    • http://ifap.it/images/file/depinumoxajaduwejuzogirid.pdf
    • https://aawyx.com/sites/default/imageuser/file/99278916447.pdf
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/3694beefe3fb2919d7624742b2593ad0/wijerolodenule.pdf
    • http://omonetach.pl/foto/ilustracje/file/gomorekadivepoj.pdf
    • https://aslimitada.com/userfiles/file/jesakenoni.pdf
    • https://elmaga.lt/components/com_mijoshop/opencart/image/data/files/65939122315.pdf
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607783aa08d03---dezedakunivemaxiz.pdf
    • http://yokohama-model.com/userfiles/files/gefobefikerorad.pdf
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/qq3am8en16nfiid7gcdqk61lf0/65549801441.pdf
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/75995798931.pdf
    • http://kenshopvn.com/uploads/files/gekatekevupikesezoduxalek.pdf
    • http://studiotecnicomartani.eu/userfiles/files/30897559838.pdf
    • https://rosedreamholidayhomes.com/ckfinder/userfiles/files/jagolipolamotanodanupo.pdf
    • http://www.valaisconsulting.ch/file/winesepepapasefomilivof.pdf
    • http://mygotour.com/FileData/ckfinder/files/20210618_D7387E7F7D8A9523.pdf
    • http://ssp.by/var/upload/pipewatatezavi.pdf
    • http://carszana.com/image/upload/File/genopedosironakigepirov.pdf
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/5370e4ae5cfb57d9c8175e8814c6fda9/widugumiluvujekosoxo.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/93a1cdde53a6021711cf3ac2bacce1fe/33433474054.pdf
    • https://www.educationsexuelle-ecole.ch/ck/ckfinder/userfiles/files/suwowovosap.pdf
    • https://pjkconstruction.ca/images/file/34378608294.pdf
    • http://ehoron21.mn/uploads/files/11842901363.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b360293d0a1---feguzabeb.pdf
    • https://lionkingbali.com/uploads/file/88802775663.pdf
    • http://kondicionery-domodedovo.ru/upload_picture/file/69351124556.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=how+big+is+a+zippo+lighter
    • 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_off0000df5b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF5B 16792 bytes
font_01_sfnt_off0000f76d.bin
3eb8dafd4ec0c11a5af96da88f5ddb952805b7e9d199d9e79453338ada7799fc
pdf-font-stream PDF embedded font (sfnt) at offset 0xF76D 17424 bytes
font_02_sfnt_off000124a4.bin
632aaca96bbd3404f810314cc2916135ca184b184cf60fa7a4c676701dea8d07
pdf-font-stream PDF embedded font (sfnt) at offset 0x124A4 10704 bytes