Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1a091f724933371…

MALICIOUS

PDF

82.5 KB Created: 2021-07-20 16:19:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 32032e079b6fcd16733c0752cd04d27b SHA-1: 67cbfd5f244124d9e2020b41568b7403daf8d722 SHA-256: f1a091f72493337122636c5bdc9953d96c86964939537c84697d901e56abd9c6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous compromised websites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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://fonnepal.org/userfiles/file/85632392167.pdf In PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/bb514d12b2ad3fd2f31871fea82a2dae/90407104216.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe236f163b---15505776903.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cd3a6e7d2e---losadewavoneku.pdfIn PDF document text
    • https://www.cittadelmiele.it/wp-content/plugins/super-forms/uploads/php/files/db707a788250c476240e18a1eada5299/12366908545.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/0d35e52c8743d15819318f144affacb9/namirik.pdfIn PDF document text
    • http://cbwmd.com/uploads/Files/26178018712.pdfIn PDF document text
    • http://c2r-auto.com/uploadfiles/file/2021051910133373499.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/uc7ki2014oah6b49jnesi73hbb/84078676262.pdfIn PDF document text
    • https://vigiweb.cl/dinamicos/files/file/55620132725.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/27625723490.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bd3a86c910a---60362865188.pdfIn PDF document text
    • https://harrisitalia.it/uploads/file/jukakoxad.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd1756eb75---lizoruw.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8bcecd782---nepexipafifojububika.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608422e537ffd---pikamozaposap.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/786f7e84204ee3242d0e36380e48185e/23929012281.pdfIn PDF document text
    • https://dadrarad.ro/userfiles/file/zogufuge.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088bee270dbb---68139036308.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/pvcsn7sdjtvmppts3vf9hnqn86/92094183010.pdfIn PDF document text
    • http://computergramm.com/userfiles/file/76099208665.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160f04ecc7a364---96885578608.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/q0ov8k5j0lpq2o2rk3e6augae7/dinazigesulo.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/posilupodekutadonemekez.pdfIn PDF document text
    • https://coil.hk/upload/files/4169488852.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=this+is+just+to+say+by+william+carlos+williams+meaningPDF 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_off0000db80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f397.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF397 11208 bytes
SHA-256: 60801a06b740be0093317c639ca44948f19f166015f419e714da0552871fe837
font_02_sfnt_off00010db6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DB6 17312 bytes
SHA-256: 0e128c978a0d281f2d6d96ef49506c82015bc8b7816f7347070b29376fd04e4a