Malicious PDF — malware analysis report

Static analysis result for SHA-256 e136e8f4a0af6c07…

MALICIOUS

PDF

88.9 KB Created: 2021-07-10 10:20:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 81e841f6f506d6eadf246d5bff326416 SHA-1: 21273d3a6174aeb216cc97c53774996a45b1c828 SHA-256: e136e8f4a0af6c0792f3d4136d8c39345a358021b4d6a622f62f1e98e7fc2850
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded links suggest it's designed to lure users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/06b970fb2bae93547b17656e31972a12/vumupagelebuzofije.pdf
    • https://arch.ua/ckfinder/userfiles/files/kegujamexu.pdf
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b368dccf33---50267496396.pdf
    • http://nrnchina.com/test/images/ckfinder/files/24298620899.pdf
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/96ba164f0865d2538fa9e974088cbc57/7186527751.pdf
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5d4aea3ed---limukapifemola.pdf
    • http://aldo-ins.com/userfiles/file/14365332898.pdf
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb12aa61085---25214482879.pdf
    • https://delaneyllc.com/ckfinder/userfiles/files/21105736557.pdf
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/r1plofgodheicgpr58pnunrio7/temivi.pdf
    • http://chandigarhdatarecovery.com/files/file/morekafo.pdf
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c64aa9e4617---javalefopupemawipejuvifep.pdf
    • http://eko-inwest.eu/upload/file/57224762818.pdf
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608081cbab76c---sadulusimawiti.pdf
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16079b9737bac2---61720681974.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/qpo37uf3oi2ua7c5jf0bqdh4s6/lexosisikilor.pdf
    • https://egyseg.eu/ckfinder/userfiles/files/41598256909.pdf
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/1rn3171ikl0s9e99n19pdo5bp4/zudalizef.pdf
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/29a3ebd11252c736861c21796a3c1b6f/fikopoletinasominanuve.pdf
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d7f2ddf592---32280418086.pdf
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/lh3fjkb04equdro9s2hg1c9dqo/66150709429.pdf
    • http://cadelupo.it/userfiles/files/vobawonowegobu.pdf
    • http://jjmcp.jp/userfiles/Image/file/posewizafa.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=sql+injections+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_off0000f698.bin
caf26ea2446783091af13d53e2f7c9e3033488c202fbc505d3cbb259ef1e1cae
pdf-font-stream PDF embedded font (sfnt) at offset 0xF698 18000 bytes
font_01_sfnt_off00012637.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12637 16792 bytes
font_02_sfnt_off00013e4e.bin
94dc9781442cda5399dc1680428fe7125b55d5b6fcfe660da3b435bc56ca3b75
pdf-font-stream PDF embedded font (sfnt) at offset 0x13E4E 10704 bytes