Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f2ada89e3afc2d7…

MALICIOUS

PDF

73.0 KB Created: 2021-09-20 14:52:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 84c151bdfd6cb3798a64b0703e28fd5f SHA-1: 952d8de85e5a75fe2cc086676dc8016a05e5a53b SHA-256: 7f2ada89e3afc2d7c09dffd132f9cfcab00bd31c15b75772bf2f68a03cf73441
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are identified as link farms on disposable or compromised hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to download further malware or visit phishing sites. The presence of multiple PDF link farm heuristics supports this conclusion.

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 http://taaltoetsvo.nl/userfiles/file/62243236520.pdf In PDF document text
    • https://z87992961.com/upload/files/20210906224827.pdfIn PDF document text
    • http://global-leasing-management.com/uf/file/waretunazujijodenulefelo.pdfIn PDF document text
    • http://ecilingirler.com/resimler/files/fatirivit.pdfIn PDF document text
    • http://umffz21.ru/admin/ckfinder/userfiles/files/91183299506.pdfIn PDF document text
    • https://7mark3t2-7aya.com/contents/files/44506286450.pdfIn PDF document text
    • https://rajakeempat.com/contents/files/zoxekovib.pdfIn PDF document text
    • http://usarsenal.it/userfiles/files/matesasilaju.pdfIn PDF document text
    • http://stellarp.com/userfiles/file/palum.pdfIn PDF document text
    • http://3e3i.com/UserFiles/file///28142368311.pdfIn PDF document text
    • https://bwawarszawa.pl/upload/file/37621778860.pdfIn PDF document text
    • http://zeci.nl/im/image/32787922126.pdfIn PDF document text
    • https://www.burnat-provins.ch/ck/ckfinder/userfiles/files/gijelazese.pdfIn PDF document text
    • http://cukrarska-vyroba.cz/UserFiles/File/22676198328.pdfIn PDF document text
    • http://vinacafe-dalat.com/Images_upload/files/84622780324.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/15ed161a302c00713af62309fa8e701f/sogazusoxajewas.pdfIn PDF document text
    • http://agedwedfjtj.pretty-match.com/upload/files/34580485418.pdfIn PDF document text
    • http://ipceurope.com/assets/file/29611874314.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613739e77f3ea---janubuzuwonajup.pdfIn PDF document text
    • https://o-dance.com/upload/files/6103949767.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/c552661fbeb5adfd568f76aa54ca6b7f/xukotipobozuxik.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137d1ddcaf76---35096618773.pdfIn PDF document text
    • http://baocaosudanang24h.com/uploads/image/files/31568641338.pdfIn PDF document text
    • https://autonoleggioassereto.com/file/14329613416.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=apk+pubg+mobile+free+downloadPDF 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_off0000baad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAAD 16468 bytes
SHA-256: 4e0656a628e53887e61398c302201f42105af12682927ad90666e2c79f91e1cc
font_01_sfnt_off0000e4f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F0 10972 bytes
SHA-256: 9199e00239fc35b6b5ae73354747290b306df32eb6db4fdabfde48be76dcb018
font_02_sfnt_off0000fdf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1