Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7dd29bc738f367d…

MALICIOUS

PDF

85.8 KB Created: 2021-08-21 06:41:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2f619a21f02860eb36655f11c908ac00 SHA-1: 9c1397764afec70e6a80499612e72be58afa0353 SHA-256: a7dd29bc738f367d2c72fd9ae646125465db8d9033b630252ca208f919a1cc6f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm directing users to multiple external URLs, with several pointing to compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure suggests a phishing lure designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://aucoindeshalles.com/menu/file/7827966998.pdf
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160ad99539460f---62290643597.pdf
    • http://sanxuatbanthinghiem.org/app/webroot/uploads/files/82677843246.pdf
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607eff4016c0a---watadetojedog.pdf
    • http://kolkandkolkdesign.com/site/data/ws/files/polodazij.pdf
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/iugdtpvt301isnlcrlugj2pn6f/94755121155.pdf
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3094704927---powijolomalebim.pdf
    • https://alakharia.com/public_html/userfiles/file/18184991555.pdf
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d24314674---vujelixipokamawodomevunar.pdf
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16073b06c1e574---13791833100.pdf
    • https://flour.co.uk/ckfinder/userfiles/files/52523950360.pdf
    • http://ash-graphy.com/userfiles/file/79202055575.pdf
    • http://air-con.ru/upload/files/10477883709.pdf
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/1e41d4eca9ed685bdd0ee8c635a94042/radozubobatega.pdf
    • http://goodtraefarm.com/ckupload/files/86178694313.pdf
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16090dfbb819df---3960480391.pdf
    • http://tarnava.eu/user_images/file/pazinozuwebebufa.pdf
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160979dc00f386---12391025453.pdf
    • http://119hero.kr/userData/board/file/63596710266.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160b14f1c5512d---16719735490.pdf
    • https://liniagdanskzydowo.pl/files/tifudugozab.pdf
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0f858107c---42088127717.pdf
    • http://tribo.kz/userfiles/File/wopokusufomusokif.pdf
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a485f40f33b---14316328491.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=o+que+s%C3%A3o+inibidores+enzim%C3%A1ticos+qual+a+sua+import%C3%A2ncia+e+classifica%C3%A7%C3%A3o
    • 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_off0000e3b2.bin
f991b992fe18bcdddab9c4e926d41029b7ea69fa90f9257582dca998e992afe8
pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B2 18736 bytes
font_01_sfnt_off0001111c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1111C 16792 bytes
font_02_sfnt_off00012933.bin
24177f7d5df02ec49643678bdcaf9e1acb294c40ff0d12e82ad8e3eebf9dd50d
pdf-font-stream PDF embedded font (sfnt) at offset 0x12933 12084 bytes