Malicious PDF — malware analysis report

Static analysis result for SHA-256 e81d67f891163191…

MALICIOUS

PDF

97.2 KB Created: 2021-07-12 22:14:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 34cc3877bf82d3190e721b4063947be2 SHA-1: 0be0b89f3605db45399943d2586cc44c80003d83 SHA-256: e81d67f891163191f50988edf868e27847d14eefe9a4e3d79ac88aa89d1be916
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress sites, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to malicious content or download further payloads. No scripts were extracted, but the PDF structure and embedded URLs are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://allytemp.ru/uplcv?utm_term=normalization+in+sql+example
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/0e0d94faf44d91bff3ad566cba82e2a7/46123937774.pdf
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160722447b8762---bukovolomawiv.pdf
    • http://ajk-opakowania.eu/upload/fck/file/84757249857.pdf
    • http://ckrestaurantgroup.com/ckfinder/userfiles/files/99781003832.pdf
    • https://ms01bet.com/contents//files/99641453161.pdf
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a5d34a3c5e059b71a509a8074395876e/72368787912.pdf
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608fb0f59bcd2---nilet.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/s4u66ap1t00t2ci9v5u4oqflr3/22085383901.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/b2029a15b0c6e78269603dbc51f3b4c9/nowexomevovilukoreme.pdf
    • http://aarogyamedico.com/userfiles/file/mefizezanomavifoda.pdf
    • http://ats-dz.com/userfiles/file/bekef.pdf
    • http://sowitech.vn/upload/files/zukapurisu.pdf
    • http://scamps.biz/userfiles/file/76714008839.pdf
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f94d78f312---16376291093.pdf
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/9c12d1f36262b2d3fe8461bb00bb0c5a/78927118256.pdf
    • https://angel-juicer.com/FileData/ckfinder/files/20210606_33736E97B3E5DC57.pdf
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ff1d55809f---45067859540.pdf
    • http://sfera-vlad.ru/img/file/69558244452.pdf
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/dc0f63be8a81a1a0b81ab2a8788c6722/dideluranolozeja.pdf
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/1609bf56311c38---kakuzogamijuvavujelezakin.pdf
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c06c9bf6e1---10638474414.pdf
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce499ad491---12548043614.pdf
    • 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_off000115ee.bin
741d355fe70024bf143138ce7b6b60da25bc5d68f32a50de7bb54ca4457cec60
pdf-font-stream PDF embedded font (sfnt) at offset 0x115EE 18104 bytes
font_01_sfnt_off00014568.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14568 16792 bytes
font_02_sfnt_off00015d7f.bin
d026e4ac52232e6043286dcba0e68af8cb829cda31b1bafa2b7f55eda13050d2
pdf-font-stream PDF embedded font (sfnt) at offset 0x15D7F 10696 bytes