Malicious PDF — malware analysis report

Static analysis result for SHA-256 92d9e93c9a8ecb0b…

MALICIOUS

PDF

69.0 KB Created: 2021-09-30 19:16:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e1803c9f8c2b0d2f0f65a7d6ddfccd9f SHA-1: 1adea8688dc018f376822e8c7d3a63ce8e7bbd77 SHA-256: 92d9e93c9a8ecb0baf744682c6722d996a843952e254ddb7cf3c7be3023be649
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 are hosted on compromised or disposable domains, indicating a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The presence of external URIs and link farms points towards an attempt to lure users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://catamma.ru/uplcv?utm_term=watch+waking+life+online+free
    • https://mingyi-lock.com/data/file/userfiles/files/pazuxikavoximunupato.pdf
    • http://eqletstalk.com/uploads/files/202109011838437486.pdf
    • http://architettosbaffo.com/userfiles/files/lowite.pdf
    • https://gornjastubica.hr/files/67033716967.pdf
    • http://xn--b1akwe.xn--p1ai/userfiles/file/banimonerupeluxa.pdf
    • http://gancza.pl/userfiles/file/wifaz.pdf
    • http://ideatity.com/ckfinder/userfiles/files/5580998961.pdf
    • https://majorsagilekvaros.hu/uploads/file/liloguropidofonen.pdf
    • http://zentrumok.com/userfile/files/82461955787.pdf
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148e91442209---80225627206.pdf
    • http://geologocarmignani.com/userfiles/files/46775403909.pdf
    • http://alfavs.eu/userfiles/file/konizarabibub.pdf
    • http://thewhitmerlawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/44409355313.pdf
    • http://doubler-son-capital.com/photos/files/posiliwofeto.pdf
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614874854ec2d---51064413489.pdf
    • http://ky-auto.com/uploadfile/files/53522382297.pdf
    • http://ebbers-schilderwerken.nl/uploads/files/rofuzi.pdf
    • http://bfr-bialapodlaska.pl/userfiles/file/telos.pdf
    • https://equinox-e.com/upload/UserFiles/file/wekubufitebososa.pdf
    • https://hzautomatisering.nl/userfiles/file/35161364840.pdf
    • http://bijverhoeven.nl/uploads/files/35182848170.pdf
    • https://gestionarival.com/userfiles/file/saxuzerifiw.pdf
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e4fae0c84---95635949175.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_off0000aef4.bin
5341adbb0c5a522169a4c97a5f823cdfff99b9134fdcbbc2e2ab1d30f4085650		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAEF4 15388 bytes
font_01_sfnt_off0000d5fd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD5FD 16792 bytes
font_02_sfnt_off0000ee14.bin
e58eecd03b1e1ba01e4f6b7cf2ddeb4c167d6e088d355cc943fa4fe8b7dfbe3c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE14 10616 bytes

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