Malicious PDF — malware analysis report

Static analysis result for SHA-256 26077d5739299052…

MALICIOUS

PDF

68.6 KB Created: 2021-09-30 16:01:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 017b3da52cb53bd07be1f21a295b6418 SHA-1: 84d5d9b68df62ef6737bf5448a49c1e279d8f56c SHA-256: 26077d5739299052813400d2b6df061fb13edf625285ff66226dd5f2b5ed4ff9
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised or disposable hosting domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of multiple external URIs and link farm heuristics points towards an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://beldapin.com/calisma2/files/uploads/vugedevezar.pdf In PDF document text
    • http://khocabien.com/uploads/files/tulad.pdfIn PDF document text
    • http://dejede.com/userfiles/file/xogupepex.pdfIn PDF document text
    • http://agedwedfjtj.pretty-match.com/upload/files/givezegimelimipinimoze.pdfIn PDF document text
    • https://www.totalblissbeauty.com.au/application/third_party/ckfinder/userfiles/files/15820032141.pdfIn PDF document text
    • http://modra-skola.cz/userfiles/file/bamawolokodukipuzezip.pdfIn PDF document text
    • http://tfforming.ru/d/files/31819963810.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614aff8684f64---modevetoxelusavo.pdfIn PDF document text
    • https://thefertilizerequipment.com/d/files/jevipigataguzorapu.pdfIn PDF document text
    • https://turismopontevedra.com/ckfinder/userfiles/files/dugupunupivoximewetov.pdfIn PDF document text
    • https://www.sudicobank.com/ckfinder/userfiles/files/jirupuxebexoralezixixopal.pdfIn PDF document text
    • http://eubeer.vn/uploads/files/jenaromituwejizixovejugu.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613feb3bf2676---lekinuboximudibibazobodid.pdfIn PDF document text
    • http://manpukulivermore.com/uploads/files/61689238714.pdfIn PDF document text
    • http://rabotatver.ru/userfiles/admin/66231154917.pdfIn PDF document text
    • http://kortennis.co.kr/B/ck/ckfinder/userfiles/files/68500128506.pdfIn PDF document text
    • https://madspot.dk/ckfinder/userfiles/files/28873554644.pdfIn PDF document text
    • http://giprozdraw.ru/ckfinder/userfiles/files/bujedagotukubizeguviwot.pdfIn PDF document text
    • http://kimbuunguyen.com/uploads/userfiles/file/finukaz.pdfIn PDF document text
    • http://kssi.ir/public/userfiles/file/42180056795.pdfIn PDF document text
    • http://dlevitin.ru/fck_editor_files/files/rovetonaxubaruduxug.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/161387b94c5a9f---27231433840.pdfIn PDF document text
    • https://cakkue.com/contents/files/jubijojapizunuzalipes.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=carrom+pool+mod+apk+2021+latest+versionPDF 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_off0000aef4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEF4 14476 bytes
SHA-256: d3d4789d52223dac53326b0dc691e01d51ebc3388fbe9322119e730366cc5130
font_01_sfnt_off0000d306.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD306 11036 bytes
SHA-256: 641a943e7de5aa6c22b0b233a85612008e76bc36ed0a67ffe9cb53840dd5512c
font_02_sfnt_off0000ecc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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