Malicious PDF — malware analysis report

Static analysis result for SHA-256 3045e74c2f794d59…

MALICIOUS

PDF

69.1 KB Created: 2021-09-27 09:12:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 15b2ff6c1c9ef18607cfd35c78f054e9 SHA-1: ef1422c153bd676bbd3d2ecfd5cea5f1927389e1 SHA-256: 3045e74c2f794d59a19cf511cdd7ea68dd95205eee3d8522c33fe90240b2e45c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, with several heuristics indicating it functions as a link farm hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to phishing or malware distribution sites. The presence of embedded JavaScript points to its use in executing malicious actions within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://thebookmarkcafe.com/uploads/files/veduwarog.pdf
    • http://jeansresource.com/js/ckfinder/userfiles/files/49356753697.pdf
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/hv3n1rtjrk9bchvrcsf49ej3vi/sesirewodoxizon.pdf
    • http://xinyuemu.net/assets/202109/files/20210917210032513399.pdf
    • http://impex-italia.it/userfiles/files/66387820467.pdf
    • http://guchen.ru/d/files/mavaxab.pdf
    • https://agri-mal.pl/userfiles/file/labuzuwurokisukonagupimo.pdf
    • http://live-net.it/file/xidunuxoxak.pdf
    • http://huarui-bio.com/upload/files/74576151028.pdf
    • http://dachastyle.com/userfiles/file/nefebonarana.pdf
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/161313616c13d9---komot.pdf
    • https://galerieportelouise.be/userfiles/files/wimokagi.pdf
    • https://gencshoworganizasyon.com/upload/ckfinder/files/ravadolujikogine.pdf
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/16142e9f238ad8---52239941141.pdf
    • http://111-orte.de/testarea/cwsCMSlight/media/files/75194477066.pdf
    • https://ihappywash.com/uploads/files/202109011719167823.pdf
    • http://schoonhovensvrouwenkoor.nl/ckfinder/userfiles/files/tuwadoxutuxejepabodiw.pdf
    • http://takramaipai.com/mypicture/file/lumuwadeditosowobef.pdf
    • http://abwingsva.com/uploads/files/111994748.pdf
    • http://mellorymotors.ru/admin/ckfinder/userfiles/files/76092402924.pdf
    • https://magnanelli.com/userfiles/file/66822159904.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=fk68+smart+watch+price+in+pakistan
    • 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_off0000ac1f.bin
0c2ae10eb0f135d88c1daf5b923be34be3b55cfe411ee047b5294e4197a1268f
pdf-font-stream PDF embedded font (sfnt) at offset 0xAC1F 15804 bytes
font_01_sfnt_off0000d3b8.bin
b139165c9c661f8a331326d143b6dcd8af69fbb27128036221804e81867bc149
pdf-font-stream PDF embedded font (sfnt) at offset 0xD3B8 11004 bytes
font_02_sfnt_off0000ed2e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xED2E 16792 bytes