Malicious PDF — malware analysis report

Static analysis result for SHA-256 f551014bd7d3d6f8…

MALICIOUS

PDF

72.5 KB Created: 2021-07-02 11:25:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 46f7f93dac40198d3b854fc7f3496870 SHA-1: 076fe86772cd4f84aa6086ddab594d451e86c894 SHA-256: f551014bd7d3d6f8c01adcc749cdec902e266c57fd471223f91e9f95dbfb2a75
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV, indicating it is likely a phishing or trojan delivery mechanism. The file contains a link farm pointing to numerous compromised WordPress sites, suggesting an attempt to redirect users to malicious content or scams. The presence of embedded URLs and the nature of the heuristics strongly suggest an attack pattern involving spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://irlanc.ru/uplcv?utm_term=robux+to+dollars+converter
    • https://clubesolbra.com/uploads/files/duxarapufitovaled.pdf
    • http://casaatlantida.com/userfiles/file///23890678031.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/f4vcr0kc10ekkdi3stri7k2nt2/86706315180.pdf
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/d28217dac4f2bef44de80b76e4b5d6df/98730402517.pdf
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16080c5926bbba---gafelulaziputodu.pdf
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c26341b612---ragogotovusilumuzixoxele.pdf
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/9fa098331a425504d309d807446940c2/1492394774.pdf
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c65f11a2f6---pegowojag.pdf
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/472367d4fee74eb8b1970d137eae68e0/nelujideserijobeki.pdf
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160aab2404b877---gokuwavoguxovujez.pdf
    • http://lamachine.nl/userfiles/file/buxupozuse.pdf
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abf3ad73736---sarilije.pdf
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/t6d0m73g2967mfgmvchdmdodo3/25338214519.pdf
    • https://tiklatakip.com/calisma2/files/uploads/91754413343.pdf
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/9d33aca55993587aa358786f8f792f23/muwujopewunagiv.pdf
    • http://rc-modeller.se/images/file///21774876202.pdf
    • http://shreejians.com/userfiles/file/96261415727.pdf
    • http://pphjako.pl/userfiles/file/metofinaja.pdf
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160ccc53b148f0---mubopidavag.pdf
    • https://animaliadielisa.com/file/bagigenilole.pdf
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/0039ff14b98ff89805dec29645ca7cd0/tazawuvokat.pdf
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076e580a61ea---77716449296.pdf
    • http://amphorabeautyclub.com/campannas/file/99548316537.pdf
    • http://ugrctrani.it/userfiles/files/lonagupujikaj.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_off0000b88b.bin
c634a86aea63f60d3f919ab5256ba3a54132826f086359cd3ad0867a8cb7e4fd
pdf-font-stream PDF embedded font (sfnt) at offset 0xB88B 10724 bytes
font_01_sfnt_off0000d16e.bin
831c7a277177e8151dedfc9b31110b16385907934c09fd0848552e782069f1e2
pdf-font-stream PDF embedded font (sfnt) at offset 0xD16E 16652 bytes
font_02_sfnt_off0000fce7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE7 16792 bytes