Malicious PDF — malware analysis report

Static analysis result for SHA-256 128f7a2e336b77c3…

MALICIOUS

PDF

79.5 KB Created: 2021-09-19 07:00:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: b6da46c3d1cdb0bfd56581e339af1617 SHA-1: 8b9e13a6bc7a6fca80dd17dc27e2466f6e43d9fb SHA-256: 128f7a2e336b77c35486e68aabc58cc7c3fda207c6c0ffb52bf00bc8ad108c45
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of a link farm on potentially compromised CMS upload storage suggests an attempt to obscure the final destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://crewmak.ru/uplcv?utm_term=mobdro+tv+guide+download PDF link annotation
    • http://gavionescodeinsa.com/userfiles/wuzerazarigavefam.pdfIn PDF document text
    • https://sudhirsachdevaclasses.com/ci/userfiles/files/zexuselavitadefaket.pdfIn PDF document text
    • https://specializedfacilitymgt.com/public_html/userfiles/file/xufidawufonamosaxalitiw.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16144db05d81ff---kenudizekotonazabogudana.pdfIn PDF document text
    • http://wabasnb.com/files/fckeditor/file/1764763841613d34e2a8c34.pdfIn PDF document text
    • https://goldfieldssanddrags.com.au/ckfinder/userfiles/files/73955591635.pdfIn PDF document text
    • http://dc-07b6a75bc4d0.breakthrough-physical-therapy.com/userfiles/files/91090024166.pdfIn PDF document text
    • https://eklyps.net/images/file/vorakegusa.pdfIn PDF document text
    • http://fszhenjia.com/upfolder/e/files/20210906140052.pdfIn PDF document text
    • http://kadet-ck.cz/pic/file/9149983398.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161312e33c5c35---60995034280.pdfIn PDF document text
    • http://gpp300.fr/userfiles/file/liwapesupesotet.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/68998132355.pdfIn PDF document text
    • http://birkhoffhi.com/userfiles/files/38874086562.pdfIn PDF document text
    • https://www.gico.ge/ckfinder/userfiles/files/80006701892.pdfIn PDF document text
    • https://laetitiabernard.fr/images/file/nonazugiwirinukubuvipar.pdfIn PDF document text
    • https://renfrewareahealthvillage.ca/ckfinder/userfiles/files/zomamebe.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613c11ac96e5c---95766600061.pdfIn PDF document text
    • https://terminarz.online/kosmetyczka/krakow/files/biragisanigisunegituj.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/161307c998ccac---simotukub.pdfIn PDF document text
    • http://keystoparadise.com/userfiles/files/konugadipopolosiforipi.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141ff43ef25e---10034318291.pdfIn PDF document text
    • http://poddertradingandindustries.com/userfiles/file/7357296069.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_off0000d41e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD41E 10640 bytes
SHA-256: 04888b406296ef7ce7275045ca789d68fc9e1b709fa04f882e056740a4d884d2
font_01_sfnt_off0000ec6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001047f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1047F 17016 bytes
SHA-256: 16b238b8f056f3a67ad627466de63fbb2524d790fd7fbe3f5f9fca2eab0a1a48

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