Malicious PDF — malware analysis report

Static analysis result for SHA-256 f48f323fdf3b843a…

MALICIOUS

PDF

69.8 KB Created: 2021-09-26 09:43:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 51bf41dba4bd3b1ce36eef1e92eaace5 SHA-1: 8fb07be403064211c270fb9413377c4d502473f4 SHA-256: f48f323fdf3b843a92cdddfae12ce82842452f7620b7aeaa690164a5ff06b475
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No specific family could be identified.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://letdentalab.com/img/files/pafogurag.pdf In PDF document text
    • http://americandeliorder.com/uploads/files/29367111223.pdfIn PDF document text
    • https://dolnoslaskialarmsmogowy.pl/imgturysta/files/denoxalado.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613452359c13b---padomiw.pdfIn PDF document text
    • http://fpempresa.cen.es/userfiles/files/88557516063.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/koxetemuravewugipufa.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/43410469607.pdfIn PDF document text
    • https://bevillelecomte.ovh/ckfinder/userfiles/files/85603361223.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/a3e9f019bb8e0d02bc75d273512c467a/80950980293.pdfIn PDF document text
    • http://n2nnetworks.com/files/others/49328787212.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/f9b9daeff919e994355cb8dcac3ced30/funokajinawepusesidi.pdfIn PDF document text
    • http://konferencii.org/js/ckfinder/userfiles/files/97228483476.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613fdad313297---lotet.pdfIn PDF document text
    • https://asiquim.com/ckfinder/userfiles/files/xupinisowegomubuso.pdfIn PDF document text
    • https://trvstore.com/userfiles/file/8362096390.pdfIn PDF document text
    • http://gardens-spa.com/user_pict/file/37426296297.pdfIn PDF document text
    • http://praguynakorn.com/praguynakorn/picture/datapro/files/zadijasidewotugal.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/bexowe.pdfIn PDF document text
    • https://www.luxboss.com/ckfinder/userfiles/files/visunodusukem.pdfIn PDF document text
    • http://ramenzoni.eu/userfiles/files/20509342501.pdfIn PDF document text
    • https://libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/7634302955.pdfIn PDF document text
    • http://cdenito.net/userfiles/file/xidegopub.pdfIn PDF document text
    • http://neoneophytou.com/ckfinder/userfiles/files/11293966808.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=sword+art+season+2PDF 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_off0000b16f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB16F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c986.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC986 10384 bytes
SHA-256: e95423e23f6e46855ef41a107e3fdc9c45124c178db94ae44a1cec35fa658f93
font_02_sfnt_off0000e141.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE141 15840 bytes
SHA-256: 35949f2718ca6f37fde523daf725ffeee6f464acfa70f2180cd5b3439a29d7e2

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