Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec3e5c40d97e159f…

MALICIOUS

PDF

87.3 KB Created: 2021-09-06 10:52:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 582fe0394e6f2c2c59a31bcbf8260ebd SHA-1: 4548328840434c7055acd036fdf81f76be74a57d SHA-256: ec3e5c40d97e159f9108c2a523b224429696a5742b10418b486a3127796d0083
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs and links to compromised CMS uploads, suggesting it functions as a link farm. These links likely lead to phishing sites or further malware downloads, aligning with a spearphishing attachment attack pattern. No scripts were extracted, but the structure and URL patterns are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://ketchas.ru/uplcv?utm_term=remember+the+time+book+pdf+free PDF link annotation
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/4ec4211a0c92e94e379462f0153f735a/lumurugodir.pdfIn PDF document text
    • https://locoffice.ru/userfiles/file/72296084607.pdfIn PDF document text
    • http://avvocatoandreabruschi.it/userfiles/files/dezepiwotek.pdfIn PDF document text
    • https://pnp-studio.com/fckeditorfiles/file/89429603103.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/s5cspcvjugeoi1a6o3g9oekbh3/62663958907.pdfIn PDF document text
    • http://szyqjsj.com/UploadFile/file/20210901012952714.pdfIn PDF document text
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/cf476ded94b67ab6359b2a910272c11f/45945747450.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c288030cff---gakojavimosiz.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0514639d96---45930842218.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/40536478613.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e7d643900f7---72526238894.pdfIn PDF document text
    • http://murphysbeads.com/clients/54316/File/jepowawakelosafobatujijob.pdfIn PDF document text
    • http://rasmesafar.net/basefile/basefiles/61207811029.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/98667445496.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/bc2402590a70a34a2586bc2b77d26c02/45627412229.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/buzawulafukasubiduj.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/852af6c412983f99956e75aed65294d8/warimexafarumimejosor.pdfIn PDF document text
    • https://praward.tw/wp-content/plugins/super-forms/uploads/php/files/39575b579d76b19be814fa22607497c7/zenagoxibaruv.pdfIn PDF document text
    • http://fertilityupdates.com/userfiles/files/neketog.pdfIn PDF document text
    • http://beijingbeat.com/contents//files/vuxaxumixaxakiniw.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/2e5f685c06924301de1747f99e9b59dc/mixuxuzaraxidazujafusat.pdfIn PDF document text
    • http://parkhighclassof60.com/clients/871169/File/tetevorep.pdfIn PDF document text
    • https://livredart.com/ckfinder/userfiles/files/19027717570.pdfIn PDF document text
    • https://agatanorek.com/files/file/25568868173.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_off0000f0eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0EB 17788 bytes
SHA-256: 0d17f92a8f038ae055b333e7458680daa3748509f4f0bfa33876b12d56b1f5d8
font_01_sfnt_off00011f64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F64 10560 bytes
SHA-256: 4abc1e3e065298ad09f5db717f47874d3d42167442af90142c647d7fea1b3fd4
font_02_sfnt_off00013737.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13737 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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