Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cbe7953e4bda450…

MALICIOUS

PDF

87.3 KB Created: 2021-09-01 09:33:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1085c8f9273b807568e76aea49fd8099 SHA-1: 7a24dad141cebf4e1c6876614e8af965b230c811 SHA-256: 1cbe7953e4bda450c1fc9a4e3ceb793683e291dabb5a7155de9816d78e995e81
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of external URI heuristics and link farm indicators reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://ecogestval.com/userfiles/file/fenezisiweku.pdf In PDF document text
    • https://birudongker.com/contents//files/tuzewuzuwukub.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16097377e12f57---fivorumu.pdfIn PDF document text
    • http://mastersequipments.com/ckfinder/userfiles/files/jenamatejamo.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160db59e92e53a---wexadutelofetebe.pdfIn PDF document text
    • https://avela.md/userfiles/file/29107997484.pdfIn PDF document text
    • https://www.asoriofrio.org/ckfinder/userfiles/files/xibalisudokugiwimezuke.pdfIn PDF document text
    • http://zhouzhuank.com/v15/Upload/file/2021722162111761.pdfIn PDF document text
    • http://slhs1958.com/clients/18590/File/nuvopagor.pdfIn PDF document text
    • http://vuonlan.vn/data/upload/files/ladolowosurimavisisuza.pdfIn PDF document text
    • https://grandhotelbulgaria.com/userfiles/file/sumer.pdfIn PDF document text
    • http://dahchen.tw/userfiles/files/nuxurama.pdfIn PDF document text
    • http://de-ko-gmbh.com/ckfinder/userfiles/files/31930794552.pdfIn PDF document text
    • https://ladangmimpi.com/contents//files/41968118583.pdfIn PDF document text
    • http://metafelix.it/userfiles/files/sagurewuzegupo.pdfIn PDF document text
    • https://agatanorek.com/files/file/44839470412.pdfIn PDF document text
    • http://thedreams.cz/files/94307440845.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/q29u7349nfgi3dp7l0ilns50ht/vowunijurufekezujomi.pdfIn PDF document text
    • http://mauchlineware.com/html/chapelstreet/web/userfiles/files/netovipavisiv.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a80b04a5f20---21202141761.pdfIn PDF document text
    • http://bjqyms.com/filespath/files/20210825202445.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16072f9abbb50e---14677953693.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/10857722491.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=the+last+ride+bull+riding+moviePDF 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_off0000ed40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED40 18808 bytes
SHA-256: 9133ba7dba875bf36d506ae6495ba282b6e6ee45b872001b297f125e26cd3792
font_01_sfnt_off00011d5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D5A 10964 bytes
SHA-256: df43306219f7fb229403d8aeb757e8958157a3336f3cb1fae73741dd7c7393ca
font_02_sfnt_off00013663.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13663 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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