Malicious PDF — malware analysis report

Static analysis result for SHA-256 4564b40520c8479f…

MALICIOUS

PDF

71.1 KB Created: 2021-09-18 16:09:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d344d7b69b21f81cd3a70adf7a523bf2 SHA-1: 5412eb5d8dc3fc88d2ab0d696d97231ec60cd77e SHA-256: 4564b40520c8479f7237b04d9f971786d418ffd30f78aeaed14efa9b164f859f
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 or disposable hosting, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of external URI heuristics and link farm indicators reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://chinalabware.net/d/files/69008731818.pdf
    • https://ecoolteh.eu/galeria/file/pedevixisapivorixo.pdf
    • http://uforoi.com/app/webroot/uploads/files/59869468779.pdf
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/8fafdf19bebe840c438fab73c86ea97e/gopudamot.pdf
    • http://xn--9i1b14lwsg1seumdzsx.com/upload/fckeditor/file/29969962037.pdf
    • http://stsaischoolamritsar.com/slbdavbatala/userfiles/file/79040961315.pdf
    • http://pi-consulting.ch/download/tewixurulugifamojar.pdf
    • http://giaexploring.it/userfiles/files/40407246851.pdf
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c1191e0623---tidolazaxikapejibafigoju.pdf
    • https://cabsfromheathrow.com/userfiles/file/suxetawowagutatili.pdf
    • https://floresdeserrezuela.com/aym_image/files/kazovurimosakelij.pdf
    • http://alptw.com/images/files/77821158717.pdf
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/6955bc634da303d31a51e178fc3fabde/33929365840.pdf
    • http://lblussana.it/images/file/fekinuxugekopafuv.pdf
    • http://hsi-international.com/ckfinder/userfiles/files/xugewudutufekazigo.pdf
    • http://sahrugs.com/userfiles/file/3531085225.pdf
    • http://tatugigo.com/ckfinder/userfiles/files/lubisidaburaku.pdf
    • http://qunjl.com/userfiles/files/dojujazakexoparo.pdf
    • http://geomanteia.com/userfiles/files/18512625489.pdf
    • http://gerd-pollak.de/userfiles/file/gujal.pdf
    • http://cansuyu.org/resimler/files/28846244026.pdf
    • https://suma.ca/upload/editor/file/17600965480.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=wifi+hotspot+app+for+android+free+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b44c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB44C 16792 bytes
font_01_sfnt_off0000cc63.bin
61a4b2eff4a58b388364f6d0ec7c2d04b94fc3dff1d50c3769a055fbe2c2bb8b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCC63 10672 bytes
font_02_sfnt_off0000e4d8.bin
086c0d9c9f1cf974536eb67edbe9302f5f6b1b2e4e986aced78a4ef6adeaedd9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D8 16472 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.