Malicious PDF — malware analysis report

Static analysis result for SHA-256 a483576fc517085f…

MALICIOUS

PDF

86.7 KB Created: 2021-09-08 19:06:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0c94a03619c385f86f0513829e9cea99 SHA-1: b1b5be5c3804a25572b325e5159ab840a6cb78d6 SHA-256: a483576fc517085f18e02b3638520b1441ae339f82e3607cb1562dfab1b53599
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites or disposable hosting, suggesting an attempt to obscure the final malicious destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 https://ntct-dz.com/ckfinder/userfiles/files/42749204251.pdf
    • http://terhautz.com/upload_files/files/94516808385.pdf
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1f811aeb8---28610204449.pdf
    • https://kaktutzhit.by/uploads/files/88066711545.pdf
    • http://tipkeo.com/js/ckfinder/userfiles/files/42379657109.pdf
    • https://sanaspinler.net/calisma2/files/uploads/31526549105.pdf
    • http://marymo.ru/uploads/files/21254244056.pdf
    • https://nutrishop.in/ci/userfiles/files/tanorimobe.pdf
    • http://dentalweek.eu/userfiles/files/69581472255.pdf
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16137e30943f3a---kidululewutagoguwigep.pdf
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16137fcd553f18---nunujatox.pdf
    • https://inks.bg/userfiles/file/waveserotifawi.pdf
    • https://riolospettacoli.it/filesUploads/file/69916886427.pdf
    • https://gymlesgeants.com/upload/editor/file/59879959391.pdf
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3ec34ad4f---59568096669.pdf
    • http://vpecargo.com/userfiles/file/dolupukiwufanut.pdf
    • https://urbanlivin.lu/userfiles/files/58153187874.pdf
    • https://cncostruzioni.com/userfiles/file/xarezomurifixapigib.pdf
    • https://igruppe.no/ckfinder/userfiles/files/6324881200.pdf
    • https://led7.ru/file/gofizatapabugiwinovubeko.pdf
    • https://maciejabramowicz.pl/upload/files/file/zoronefovagadowegurebokuj.pdf
    • http://avanti.pl/userfiles/file/mokujoludamogonu.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=telecharger+catalogue+marjane+pdf
    • 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_off0000e655.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE655 16792 bytes
font_01_sfnt_off0000fe67.bin
3c6fc58d4461c84dac8bffe91561dd65e49a2bd1c435beb17851b69ff7b53d46
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE67 20672 bytes
font_02_sfnt_off00013424.bin
f9f4b958e889cf830d1c3b437448f39ab30585633b9d091091f41863593db103
pdf-font-stream PDF embedded font (sfnt) at offset 0x13424 11000 bytes