Malicious PDF — malware analysis report

Static analysis result for SHA-256 79c9e2f412ac0d50…

MALICIOUS

PDF

126.0 KB Created: 2021-08-11 21:01:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c18d67ba9961e1e6e9cfc1fd5c6fd828 SHA-1: c4eb7a40018821815875a5a05ee136a5d139b736 SHA-256: 79c9e2f412ac0d50a5ae434f17c82af11d429b9ac24ba01f3f8a8d9cd701bfad
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised websites and disposable hosting, indicative of a link farm used for SEO manipulation or phishing. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of multiple links to WordPress upload directories and the use of 'utm_term' parameters further support the link farm and potential phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/33dd942b9e91bd95564e244ac33da7fb/gozatagugavusobib.pdf In PDF document text
    • https://dongcohonda.com/userfiles/file/roladesurogozozefa.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/nr499d01i9ja7qh4gvngqfmf75/90606966485.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160829743aa41f---rabikamowepanezugegeg.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606caa31afba3---33996327404.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/16070a484ecca2---84497986820.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/a2q2cvgjbo3jv8m04024ou9c19/50247034495.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/xopadoforobevikimoro.pdfIn PDF document text
    • http://interstyle.org/content/xuploadimages/file/59031124525.pdfIn PDF document text
    • https://dalnoboy.com/data/filestorage/upload/files/ditijukudenu.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/m8b2m335b5fg2f8nnvd14lguu3/vubobura.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/93133763036.pdfIn PDF document text
    • https://makenie.com/upload/files/botuzifowinidaze.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e32c660c97---fimumatadulebigobosudix.pdfIn PDF document text
    • https://driftwoodcc.com/userfiles/files/149307541.pdfIn PDF document text
    • https://tahitotfaluovodak.hu/ckfinder/userfiles/files/wasemunusejufifif.pdfIn PDF document text
    • http://tafgambiatours.com/userfiles/file/28769640307.pdfIn PDF document text
    • http://cnc-soustruzeni.cz/files/file/pigajepirukizi.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085ddb76f634---33884464768.pdfIn PDF document text
    • http://beergolfers.com/blog/images/file/93820420639.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/tofufeza.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bb62254d0b0---rexesubozulodagu.pdfIn PDF document text
    • http://abpaluso.com/upload/file/pivitudisibu.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a08fb90ad70---33216993074.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=what+are+all+the+army+ranks+in+orderPDF 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_off00018ccd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18CCD 17032 bytes
SHA-256: d15639da0db6ab723589f35fc2d052698228a46a073e162068199e6a7ec0c63b
font_01_sfnt_off0001b947.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B947 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001d15e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D15E 10712 bytes
SHA-256: 5720997aed4bccc78a80ee57f6c9a630f4887d76b7ca17175eee49c65b553348