Malicious PDF — malware analysis report

Static analysis result for SHA-256 d389588f81a7030b…

MALICIOUS

PDF

68.5 KB Created: 2021-09-12 00:50:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 63b9a794fe292c626d058dda1b7f939d SHA-1: f208b96be21323685d67db789eaae06eb0e02f4a SHA-256: d389588f81a7030b56394b78c05479741596b0b960f34168857ef06a733df41e
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to exploit users through deceptive redirection, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://ap-qatar.com/userfiles/files/22579147574.pdf In PDF document text
    • http://hud101.vn/webroot/img/posts/files/jizitiruriva.pdfIn PDF document text
    • https://robustbrakes.com/administrator/imagetemp/file/8306801057.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613727ed811a7---gexotavuti.pdfIn PDF document text
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/21568479958.pdfIn PDF document text
    • http://ambvet-trefontane.eu/userfiles/files/pofalipimugiluni.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161318945f2f41---tarugazutupalodefoterol.pdfIn PDF document text
    • http://okeefesreef.com/ckfinder/userfiles/files/28951908713.pdfIn PDF document text
    • http://phukientubepxinh.info/gomsu/sanpham/anh/files/30678172328.pdfIn PDF document text
    • http://marisqueandopremios.com/campannas/file/74784154155.pdfIn PDF document text
    • http://almawred-sy.com/files/adminfiles/files/xiruliwerowipurut.pdfIn PDF document text
    • https://nacituran.com/userfiles/file/49927527283.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/500770b0a87de8a6744ce8695130acbc/50444351830.pdfIn PDF document text
    • https://masihpt1.com/contents/files/mogefanabawegawafezofi.pdfIn PDF document text
    • http://mauchlineware.com/html/chapelstreet/web/userfiles/files/86463654400.pdfIn PDF document text
    • http://businessvaluationapp.com/fck_files/file/12604021792.pdfIn PDF document text
    • http://lexprikson.com/admin/style/images/userfiles/file/kawasubofitigalalonifupe.pdfIn PDF document text
    • http://burragebrothers.net/demo/jolie/beta/userfiles/files/dobafasivajaz.pdfIn PDF document text
    • https://repetitorebi.ge/userfiles/files/wubupiwenikasomowoxa.pdfIn PDF document text
    • http://opersan.com/file/vawanulozigamibizun.pdfIn PDF document text
    • http://architettotoma.it/userfiles/files/44100969789.pdfIn PDF document text
    • http://live-net.it/file/gajux.pdfIn PDF document text
    • http://unseretochter.ch/images/file/8715989581.pdfIn PDF document text
    • http://dc-a0dcf319a153.breakthroughsport.com/userfiles/files/78004205468.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=block+ads+firestickPDF 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_off0000b130.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB130 14392 bytes
SHA-256: 543c1b73f97626918c185193ab4035b607c76d0de592e8d6d5f52cd9427850ec
font_01_sfnt_off0000d4c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C2 10508 bytes
SHA-256: cbd7245724b6a3d75bceb25f32a8540475664a9c3d931a4c81c7e7606c5456d6
font_02_sfnt_off0000ecdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECDB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1