Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a806e430b87bfda…

MALICIOUS

PDF

126.7 KB Created: 2021-09-06 16:22:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: f5ae5ab4a1c209d3e5fbff3ba49337ed SHA-1: 34d09f26e2758caa7abc423a05a8d2868d9677dd SHA-256: 6a806e430b87bfda923c7fc9a9454172087ef9c4809b09e79a51c3b05104f91c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malicious content. The embedded JavaScript is likely used to facilitate these redirects or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9899

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 https://wastran.ru/uplcv?utm_term=fleetwood+mac+landslide+guitar+tab+pdf PDF link annotation
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074333e2d2a3---63227413276.pdfIn PDF document text
    • https://cobaltinc.org/userfiles/file/vufosolik.pdfIn PDF document text
    • http://eurekaelearning.com/upload/news/file/89215838683.pdfIn PDF document text
    • http://ychnjl.net/userfiles/files/22711691770.pdfIn PDF document text
    • https://www.tahitotfaluovodak.hu/ckfinder/userfiles/files/97358326943.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/2323e338d6ebe78bf447672f8a2eda32/30871682600.pdfIn PDF document text
    • http://annamsaigonlaw.com/upload/files/sofobusuwil.pdfIn PDF document text
    • http://worthingtonpark101.com/userimages/dujojadinitap.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c200ec83c6b---mujiwosexapi.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca10b89425---feluzodakofa.pdfIn PDF document text
    • https://wilocom.ro/ckfinder/userfiles/files/22771687714.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/kuvuwanibivo.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1609e8751be07e---53528953236.pdfIn PDF document text
    • http://pscworld.eu/ckfinder/userfiles/files/5244764876.pdfIn PDF document text
    • http://showdoimovel.com/files/files/60167769662.pdfIn PDF document text
    • http://spoanalyze.com/wp-content/plugins/super-forms/uploads/php/files/deadae1c09dc28615d3a3cf81c3d7bba/laxamirogupizovujafugiw.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5a316f2ee0---76945889626.pdfIn PDF document text
    • https://www.herewardcarpets.co.uk/wp-content/plugins/super-forms/uploads/php/files/n32ba1lbs4rc6nkosf8skloq8u/94871997338.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160ad74d58ede4---ligalozatasobusunuvaxe.pdfIn PDF document text
    • https://www.hkfew.org.hk/ckfinder/userfiles/files/87277447404.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/1b6966a9408923e437ef6f3ec65c0539/64181986524.pdfIn PDF document text
    • https://dubaimotorcycletours.com/uploaded_images/files/23772137919.pdfIn PDF document text
    • https://china-glass-mosaic.com/userfiles/files/20210605_122537.pdfIn PDF document text
    • http://mmprogetti.it/userfiles/files/44575193677.pdfIn PDF document text
    • http://maketmaster.ru/admin/ckfinder/userfiles/files/fukevek.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b2029e5ec23---98784642950.pdfIn PDF document text
    • 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_off0001862c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1862C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00019e3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19E3E 20584 bytes
SHA-256: 1a9a56bb6687a4915142734f619e4c3299d4461052a944c5d159b3a22b4b247e
font_02_sfnt_off0001d29f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D29F 11264 bytes
SHA-256: b89aac9ccc4cb19d6fb8a2f40295dd45b85fd1d5865ee4a7c45cd0a22fb695e1