Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4f10c620592d7a8…

MALICIOUS

PDF

73.4 KB Created: 2021-09-21 08:21:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 81e7a63696b1e31f837c3f3877eb0da6 SHA-1: e25a6a93a029b9c371c58138acc995ffb187376e SHA-256: b4f10c620592d7a8114b18de1e688077020449f6df42b9737bd68ce881f0e8f1
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 WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The primary attack pattern involves users being tricked into opening the PDF and then clicking on the deceptive links.

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://oniceh.ru/uplcv?utm_term=adb+backup+to+pc PDF link annotation
    • http://daeryuhealthcare.com/ckupload/files/37149490571.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/genefu.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f55aea8ae2---49189011329.pdfIn PDF document text
    • http://alarmy-kamery24.pl/userfiles/file/84505708440.pdfIn PDF document text
    • http://video-cycling.de/files/file/38967050782.pdfIn PDF document text
    • http://yanartekstil.com/firma/files/62163227065.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16130cbd3824d6---gavokudubozorunafebofo.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613926207e6e8---35851801100.pdfIn PDF document text
    • http://adria-ex.com/images/blog/file/juromarax.pdfIn PDF document text
    • http://kmsenior.org/file/files/40049836943.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/161408070eae94---62627396993.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/58494158732.pdfIn PDF document text
    • http://uralinteh.com/uploads/files/96090548769.pdfIn PDF document text
    • http://dentalcenterstudio.it/userfiles/files/59247729733.pdfIn PDF document text
    • http://vigen12.com/userfiles/file/netarivemi.pdfIn PDF document text
    • http://densayhongngoai.com/uploads/userfiles/file/46939812324.pdfIn PDF document text
    • http://zopos.zohukum.com/ckfinder/userfiles/files/putamijedibudilapederoza.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/58821999119.pdfIn PDF document text
    • http://ever-pioneer.com/upload/files/lumabanusipokozopos.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/161422a7c4b299---vixenuteronifosulotu.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161444d2922f4c---14839977850.pdfIn PDF document text
    • http://mengnuanua.com/app/webroot/files/files/bolufabijirofowagux.pdfIn PDF document text
    • http://uniontsg96.ru/admin/ckfinder/userfiles/files/jisedegube.pdfIn PDF document text
    • http://ticaproduce.com/ckfinder/userfiles/files/38332467862.pdfIn PDF document text
    • http://cudicio.it/images/file/37495930994.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_off0000be06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE06 10180 bytes
SHA-256: 08ae4aecb61344a249dd24b5a10d3fe77b2fd3e6016659d7f2610597078c134f
font_01_sfnt_off0000d4c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ecd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD5 16592 bytes
SHA-256: d21dd4bf669288177256c15cc65878f4c74b1b883f99d5ae4f88d6e570f14581

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