Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab38817ad5d9256d…

MALICIOUS

PDF

89.0 KB Created: 2021-07-09 00:12:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8b82accfde1acba12cbf6128c0fdf987 SHA-1: 15755c18718ccb4044536589bd1d9e47631c9249 SHA-256: ab38817ad5d9256d53fbb6b261e38fc9ec9a77cc88d7cda229a21678f2168611
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://ruoumoc.com/upload/files/623971935.pdf
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/26f17a8c54bd929d1f2feafc36749cf7/rozes.pdf
    • http://evolutionchonburi.com/userfiles/files/wedezasolerojezo.pdf
    • http://gonuldoviz.com/upload/ckfinder/files/69623620082.pdf
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/m8rbhtnj1bmfnh6ilvn2t7r0dr/notifaku.pdf
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/52027198311.pdf
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/h7r2mfsqrb7n1ef0nduuhn475h/49439736550.pdf
    • https://aduanaldelvalle.mx/userfiles/file/71532113546.pdf
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/64556439815.pdf
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070f033840d5---mijovowu.pdf
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fda90abcc0---dirobufujupujavewidedaga.pdf
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/mf6ncku4igjfju9mde1ktjq3o2/sojukugigemelalom.pdf
    • http://bukharajohnscreek.com/sites/default/files/file/gajejosabuxonijafolaf.pdf
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b04db2a881---bulabolilekivusuwez.pdf
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16098ad8766755---31008128077.pdf
    • https://akapacha.com/userfiles/file/saluxa.pdf
    • http://22743333.com/userfiles/files/togumegali.pdf
    • http://clubselectionvoyages.com/images/file/55879750994.pdf
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/f74008c650687d2b4f399fb1adfcca3f/zosejeg.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/51871b77aab64faa6bbca84eaf215cbd/bobimemenedop.pdf
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607e322e5aba9---1848052477.pdf
    • http://maraulsan.com/ckfinder/userfiles/files/dijibada.pdf
    • http://vervesimuhub.com/userfiles/file/notomorudasamuvoxupa.pdf
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160926b2b222ee---51790093970.pdf
    • http://viprealestatebrokers.com/userfiles/files/zomobeguzifapusudamo.pdf
    • https://abicecream.ru/ckfinder/userfiles/files/bikalopu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=exercise+present+perfect+and+present+perfect+continuous
    • 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_off0000f903.bin
696e1e242898fec18acbb31f8719737bd0c48ed0024381cec9f71c07e7d82523
pdf-font-stream PDF embedded font (sfnt) at offset 0xF903 17224 bytes
font_01_sfnt_off00012562.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12562 16792 bytes
font_02_sfnt_off00013d79.bin
e071b200c71b3b8d9c371043ef06bfd59e665d8248cdb5742f77efa1e61dff30
pdf-font-stream PDF embedded font (sfnt) at offset 0x13D79 10752 bytes