Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e107ef2b109a0ef…

MALICIOUS

PDF

98.1 KB Created: 2021-07-18 04:30:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 84070b9b1b0f88b7f1c58df4dd22b90b SHA-1: f88091e3a5e7d01619295ac05d95ea96ad57973b SHA-256: 4e107ef2b109a0efb8f3ba194998e8761a97b351afde99e32d7eb157f7570829
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to potentially compromised websites, as indicated by heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM'. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, but the structure itself is designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://ourdesign.hk/ckfinder/userfiles/files/folijuvatuvig.pdf In PDF document text
    • https://mangonebike.com/uploads/file/38510301214.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607010e934c09---12533407139.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/a836033086c5babefc64c91925620bc7/77730515566.pdfIn PDF document text
    • http://harchovyk.com/userfiles/file/wurukepezegamuganilusoto.pdfIn PDF document text
    • http://bangdientunhk.com/upload/files/52747880471.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/wudebomodubufipu.pdfIn PDF document text
    • https://attack.lt/images/files/kuwudikomomenetogax.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160c2b80ec44b4---57128183526.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/95af18930ceb1bc1f811e84fa9f12c76/norumavi.pdfIn PDF document text
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078cc9261944---79410866786.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/16089ea410b44c---60261113102.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/fb9937bd81b4ec17cbb809591cf5e004/bisezarivafugo.pdfIn PDF document text
    • http://bbbswalkforkids.com/clients/c/cf/cf8d0549bdc9bbdffca8bc0db9808b96/File/24887778729.pdfIn PDF document text
    • http://bannhuaduong.net/upload/files/kogomuleponofexapudaxifix.pdfIn PDF document text
    • http://kojeneckezbozi.eu/userfiles/file/8536233266.pdfIn PDF document text
    • http://koreaseowon.com/ckupload/files/dodoligogowikaze.pdfIn PDF document text
    • https://airshow-bg.com/file/53683453476.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607cdb2b4dd9e---winixawudafukedututa.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/88759808923.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c9d8166983d---38214670416.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/91426883925.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608467a66af97---ralizet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=how+to+find+out+my+spirit+animalPDF 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_off00011dcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DCC 17084 bytes
SHA-256: 7c319b842aabcb44ca94df24e4b6abd597bd519bd42e380951147d3518392309
font_01_sfnt_off00014a41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016258.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16258 10820 bytes
SHA-256: c7f1a809779e93e352b431defb8e2f5b3937bebb600866ee72a9273716b3ef95

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