Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4d8159a8282e9c6…

MALICIOUS

PDF

90.6 KB Created: 2021-06-25 16:09:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b4922045e2206d07a5f951bb4de97d40 SHA-1: 962383a93e826ac4020ce5edeea5ebc02aef198f SHA-256: f4d8159a8282e9c6c9fe40713c3e98a833f46683a8e31f770eb2061edcaf573d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. The PDF also features a large number of external links, many hosted on compromised WordPress sites, suggesting a phishing or credential harvesting attempt. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://crysiq.ru/uplcv?utm_term=pre+enrolled+in+college
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160cb289fe92b5---jikafesosuvuruwape.pdf
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16080d559e6204---2449815581.pdf
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/taj9cfduim2gtt00vtidc06es5/20505824697.pdf
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/53443fe9b6fa5b0014c7e78619984214/zuwimofanirefajupuvenosed.pdf
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3f243fdb9---68020482570.pdf
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607278c24cf9e---48956430680.pdf
    • http://jrpst.pl/userfiles/file/56955359062.pdf
    • http://guides2alpes.fr/uploads/file/41924857371.pdf
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16086824ae178e---28671953153.pdf
    • http://santiagoporter.com/js/ckfinder/core/connector/php/files/79450079244.pdf
    • http://kaizousha.com/js/upload/files/88897201797.pdf
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/7b0bddc8265556ec191377f8f39c20ce/12880410881.pdf
    • http://www.awakohchang.com/image/upload/File/ovezugubenatujat.pdf
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/j6pkqkm3k5pvna3fodsc4j99ko/81552510350.pdf
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a470d0ef7a6---71273012071.pdf
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a555eedbf2b---movefubajidobu.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_off00010245.bin
8dbe2972cc9e90fff0783da3a92b51af0b95f4eae9036bbdfbdfacb86c8369b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10245 16884 bytes
font_01_sfnt_off00012e04.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12E04 16792 bytes
font_02_sfnt_off0001461b.bin
55b5cbeff3dd604382e0e71bab57a7e6b0a6c0646640bc9dc5790ab23ae02731		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1461B 10120 bytes

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