Malicious PDF — malware analysis report

Static analysis result for SHA-256 6849611134473238…

MALICIOUS

PDF

92.5 KB Created: 2021-09-04 21:48:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8a4712ca7d22fcadfe6cc48ff7a6885f SHA-1: f06b2b430306621de0dbecc9e5eced5e731b665c SHA-256: 6849611134473238d2e775ee271555cc886f60f4242c0ebf34b7ff1623706699
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also contains numerous external URIs, many of which point to 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 sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://crysiq.ru/uplcv?utm_term=statistical+physics+mandl+pdf+free PDF link annotation
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/043far13fcdblbhf89hac0dvbt/27960381403.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c351cee617f---23788551766.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/660cf695e2072b8d9fd92e5b2b000013/doxiditepener.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160c5b2a0d155c---nukugatusome.pdfIn PDF document text
    • https://aslplastic.com/ckfinder/userfiles/files/nirimodamizokumikabumege.pdfIn PDF document text
    • http://technoauto.jp/js/upload/files/tovikogubeti.pdfIn PDF document text
    • https://aspirans.com/files/file/vowoguju.pdfIn PDF document text
    • http://saga.diamonds/uploads/ckfinder/files/77487627647.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16078e8056977d---49498543270.pdfIn PDF document text
    • http://londonjip.com/userData/board/file/70284368904.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/jafenazekadewisavomovi.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/7eca2e7bd2e5491cdd008081a09913ae/wasaj.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/76c250c403dccef9ea1d018186c848bc/tevuganibupi.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/0u38ldj6poeuvkps87piaq1jsa/31602095535.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/54d487eb7f39e9734fb45dfeb05ed890/31904899323.pdfIn PDF document text
    • http://greenmodels.ru/uploads/files/3345816043.pdfIn PDF document text
    • https://nestsearch.in/admin/uploads/file/83776080328.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160c79aea8172a---95711996562.pdfIn PDF document text
    • http://jjinline.org/file_upload/file/41812036713.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/togalitejadiduwagi.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/0835c5092db6c7649ab11d6568ce3806/nuvese.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB26 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011338.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11338 20900 bytes
SHA-256: 09a1edbed25980dab5babf4886e200c9dc937f457e543c27154e3d5d13d06c61
font_02_sfnt_off00014943.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14943 10956 bytes
SHA-256: ab85f25ffc961dc1c5d1b38e28bf1a10f097654bc3ad3e6d685bc059eb754e44

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