Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5a2081368a2a047…

MALICIOUS

PDF

82.2 KB Created: 2021-09-03 13:52:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 254eb232b0d5da43e04961fe33183549 SHA-1: d131391d4e48498d9e7104d56a34f4d9f4210de2 SHA-256: c5a2081368a2a04769842d78320a35c7ef3320445ab96d803b01fecfce00532a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to potentially compromised websites, many of which host other PDF files. This behavior is indicative of a link farm designed to distribute malware or facilitate phishing. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/fe0c969c2236caa70feb112884f2865f/84925852703.pdf In PDF document text
    • http://schokoladenfontaene.de/idata/tizuvapivomuni.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/32934586381.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/912111af0f89ac38e65b21ed733d073a/85639815008.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/d67330682e42aadd90d1570caf035cda/10763062418.pdfIn PDF document text
    • https://hirurgija.me//files/tonetoveseradasivuz.pdfIn PDF document text
    • http://magnachip.cn/userfiles/file/20210513174742.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f7273bccf19---sijajan.pdfIn PDF document text
    • http://soluzionebenessere.eu/userfiles/files/88672595648.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/616ee92e75f32fd6e75ea272c1982eec/fuvevalefi.pdfIn PDF document text
    • http://thriftstorewebsites.com/flash/thriftstorewebsites.com/file/lopudizanotavonunotegex.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be02abc73c2---jotonujiburovevutezowem.pdfIn PDF document text
    • http://the100voicesofgospel.de/fichiers/newsletter/file/gupaviroxelelawo.pdfIn PDF document text
    • http://ajisushionline.com/uploads/files/28411686495.pdfIn PDF document text
    • http://kruengrangthai.com/files/files/36000576853.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/13b615cac3a17ad9d4fb07381758743e/wetivogometikaw.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1e89ace631---74296710490.pdfIn PDF document text
    • http://dmhu.eu/uploads/uplib/file/88111131127.pdfIn PDF document text
    • https://cungcapthitdetuoi.com/app/webroot/files/images/pages/files/72250808977.pdfIn PDF document text
    • http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/85843163643.pdfIn PDF document text
    • http://islandpointfl.com/userimages/94412240494.pdfIn PDF document text
    • https://skvely-kup.cz/files/file/zuroxijerewujoxumifadiwi.pdfIn PDF document text
    • http://hf1968.com/clients/48820/File/66911931792.pdfIn PDF document text
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085440d26df3---23757517007.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=dwg+to+pdf+autocad+2013PDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF35 16588 bytes
SHA-256: 109dc1064e332f3d36cb7796a06b49f751c8bbc62163da3451dd41225b0098ae
font_01_sfnt_off00010a6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012286.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12286 10804 bytes
SHA-256: f71145a10d8f255c2b4a2889ba7c9af907eb66e0c0f223e65f1a5b540926ebb0