Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa9f0fd01dc8124d…

MALICIOUS

PDF

85.8 KB Created: 2021-07-03 04:37:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d41623029656a50b5baacd490a3693ef SHA-1: 67847138ed4d361e4617a35339696b128a9aef4b SHA-256: aa9f0fd01dc8124de1010b508906dcbc91624f502259e44de50c8141cdfa8fca
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised websites, a common tactic for distributing malware or conducting phishing. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content, likely as a first stage of a larger attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://happysmilecard.com/uploads/files/kejirinol.pdf
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160b3369b1d508---59201644779.pdf
    • http://sola-brothers.com/userfiles/file/xopepusojimiluzavomi.pdf
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b815657522e---51657749175.pdf
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/75074633491.pdf
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/3t4g2alg08shi32imf11nf549k/tikimelivek.pdf
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/e2993050ebd91aec9d30b69a8b15a8eb/58660486355.pdf
    • https://combrooncom.com/contents//files/96707219979.pdf
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/9cc1bbeb3b15076b05e76f20883f24e4/loretuwiru.pdf
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/e2bqlgepgfaei8ga8aed9u00nb/3408668940.pdf
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7ec72a5f7---33822895361.pdf
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c881d1cac8f---48928842052.pdf
    • http://atut-biuro.com/uploaded/file/49627529319.pdf
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/823b0508b6480043699ee900650ead1e/29262101534.pdf
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/92dd5d0489af7ad01dff1d0f383e5ac9/fogelebagadozakav.pdf
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/i6f376qdl9tp17kcnf0gmkpoml/dalupikopovesode.pdf
    • http://tebsc.com/clients/84181/File/bigopu.pdf
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/19a8bd90f557fde2ce1377df0ecdc47f/rujiwijow.pdf
    • http://sntaviator.ru/ckfinder/userfiles/files/vudezose.pdf
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a66030b20d6---xodefaxixipolonoliregiwi.pdf
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e9ed01986---tosipajo.pdf
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bd44c431245---498308337.pdf
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/e89ecf8fd9f261d0ecad8f5421561e8a/xamijakiwibika.pdf
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/o338ae1clvgul8dkd5ce3bso5k/31235861368.pdf
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b640b1a8c9b---22492948320.pdf
    • https://suma.ca/upload/editor/file/juzuloxogupuwogeverilet.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=rate+of+decay+formula+half+life
    • 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_off0000ea1b.bin
2a05f595cda33d5edfcd7d50bf354c9f621b88c04decd7cb9597b6e106ebb51b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA1B 10728 bytes
font_01_sfnt_off000102c1.bin
558c1df1d5148ce3cf5eeda28a2e24b9cb7446b2ab02cf728e6f3776864b1cca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102C1 17804 bytes
font_02_sfnt_off00013194.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13194 16792 bytes

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