Malicious PDF — malware analysis report

Static analysis result for SHA-256 a383ee3563174a7d…

MALICIOUS

PDF

183.3 KB Created: 2021-07-30 01:45:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f0734016971ff9f29972a0b32ccbca3a SHA-1: 38b8f95fabb3bf669ebef909df300b0e9c9c8c63 SHA-256: a383ee3563174a7d319aa43c2ef1bfe9586be656f0a9cf506723515aa237356f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal that the document functions as a link farm, directing users to multiple URLs hosted on compromised WordPress sites. These links are likely used for SEO manipulation or to distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9904

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://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160888df00cb9e---nukazetevisezixipaguleju.pdf
    • http://chipublichouse.com/ckfinder/userfiles/files/jaxodevovesef.pdf
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160945c815a1f5---xakiwozetibagonis.pdf
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16080a6dc14805---dejugetanivigezu.pdf
    • http://verkaufs-akademie.com/userfiles/file/dosasoxib.pdf
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ad065f5327b---17631119428.pdf
    • http://brookhavenclassof1967.com/clients/0/0c/0ca802fc87877f8c548ddf85495caeb2/File/26922214223.pdf
    • http://szolnokepul.hu/userfiles/file/26508795592.pdf
    • https://parklanehotel.asia/userfiles/file/63722541299.pdf
    • http://www.odnpoznan.pl/fotki/file/file/96137416838.pdf
    • http://bet-balance.com/userfiles/file/17179114004.pdf
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/d73ed8924a62d0ad9a3903f41688017f/bexokitowa.pdf
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16079d886cb0ad---1086445633.pdf
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a37fdd1153e---63577280684.pdf
    • https://cakenflowersonline.com/userfiles/file/dobowikivupizax.pdf
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bf68ee3a977---lukexanavuxas.pdf
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3163d57429---3676898555.pdf
    • https://contact-house.com/fckeditor/upload/file/xutizazejerutogiw.pdf
    • http://nitexprofi.cz/userfiles/file/tuwixaki.pdf
    • https://concertwristband.com/resimler/files/dalesazevojetuzalonav.pdf
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a06d25a65de---vojivupo.pdf
    • http://mitchelllawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/92103863150.pdf
    • http://tootingtaxi.com/survey/userfiles/files/23080215764.pdf
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/1736169a9c33f4798662384f52f4731f/96780156664.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=what+is+the+navier+stokes+equation
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00024744.bin
9b889b188be8f3bdf34b80192d102dd2590c7b914ffefc48278d919fcfa1c06a
pdf-font-stream PDF embedded font (sfnt) at offset 0x24744 10556 bytes
font_01_sfnt_off00025f62.bin
bb9ed2d5e5c3809a74fc59cc492944640c3e1ef7342caeaba2e9735c1b50dde9
pdf-font-stream PDF embedded font (sfnt) at offset 0x25F62 23696 bytes
font_02_sfnt_off00029f14.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x29F14 16792 bytes
font_03_sfnt_off0002b725.bin
b1ef7b52ed35dfd01120c19ee4193d967dc828f2fc549fe1a2d8c3c5029b4647
pdf-font-stream PDF embedded font (sfnt) at offset 0x2B725 16244 bytes