Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b73443e9bb03bae…

MALICIOUS

PDF

70.8 KB Created: 2021-09-18 09:47:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 2e0394e57544832e33eb7a220773d06f SHA-1: e417471ce5c45a8ba4558c84e349bc2e7ac12d82 SHA-256: 7b73443e9bb03baec1e52630d62a5d2bf5633615c36694a36bb8e7b22a06e456
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that function as a link farm, directing users to external websites. Several of these URLs point to compromised WordPress upload directories, indicating a potential distribution point for malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

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://garglob.ru/uplcv?utm_term=who%27s+afraid+of+virginia+woolf+full+text PDF link annotation
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/jonewedorusibabumeva.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130d3016dfaa---79838200613.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161378a043bd68---18906357124.pdfIn PDF document text
    • https://www.autopsrus.com/ckfinder/userfiles/files/80739961387.pdfIn PDF document text
    • https://turismo-galicia.es/ckfinder/userfiles/files/vamipaloboreb.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/0p05t0r7ipv4g2hbpoq3j1bkfi/kexigupub.pdfIn PDF document text
    • http://appartenvue.net/appart/upload/images/sevij.pdfIn PDF document text
    • https://ags-car.com/upload/files/fafunivotikuw.pdfIn PDF document text
    • https://cultureresortpokhara.com/assets/userfiles/files/62448826848.pdfIn PDF document text
    • http://nhanvietgroup.com/demo/xay-dung-tnx/upload/files/67058207308.pdfIn PDF document text
    • https://kabelkyaobuv.sk/editor_uploads/files/tixerapil.pdfIn PDF document text
    • http://td-mg.ru/uploads/files/6783332592.pdfIn PDF document text
    • http://novehorizonty.sk/userfiles/file/20323469271.pdfIn PDF document text
    • http://jjburgerut.com/uploads/files/17317588663.pdfIn PDF document text
    • https://kamarkosong.com/contents/files/2607188116.pdfIn PDF document text
    • http://secretinvitation.net/images/files/fodeposesaxero.pdfIn PDF document text
    • http://bretagne.annuaire-regional.com/ckfinder/userfiles/files/bizolav.pdfIn PDF document text
    • http://holdemigny.fr/ckfinder/userfiles/files/fegovepopefajokunudovoz.pdfIn PDF document text
    • http://zhymwz.com/upfile/file/jadajufuzakinokogotenige.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161420280e22bc---78314928791.pdfIn PDF document text
    • http://bibikid.ru/upload/76054011260.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_off0000ae34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE34 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c646.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC646 17080 bytes
SHA-256: d238376ea3498dfa9c2a7616853c4d3271354563aada9b433e89aeebddaea497
font_02_sfnt_off0000f26b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF26B 11012 bytes
SHA-256: 7e2a3204e063dd43c3e53ea7d24aa85f0a75ed8e20ce605ec6fda3595466e28e