Malicious PDF — malware analysis report

Static analysis result for SHA-256 c39b2dc9f9cf8757…

MALICIOUS

PDF

87.4 KB Created: 2021-08-02 01:59:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ec11d54446e5a5d22108b5076671e646 SHA-1: 7512c8b6c94b0a394aea3c9a25e7270575b01e24 SHA-256: c39b2dc9f9cf875754a2352503f0fa5cb7cf0c343f70566e46c801df8788abc8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous external links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to lead users to malicious content. ClamAV and ML classifiers confirm the malicious nature of the PDF, likely serving as a lure for phishing or to exploit vulnerabilities through the linked content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 http://plafondchauffant.fr//img/user/file/sulukitorekalaro.pdf In PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/bs5nt6ld2o2h8bv0qo5ber0q26/91899107809.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/23130723521.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078b1472884f---28514245348.pdfIn PDF document text
    • https://craftsmancuttingdies.com/wp-content/plugins/super-forms/uploads/php/files/c163acbb7fbe834819c3e9842481c504/xumurixa.pdfIn PDF document text
    • http://ourpreferred.com/userfiles/files/zawukopujijifubanasuwat.pdfIn PDF document text
    • http://area100impianti.it/userfiles/files/80371711182.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160afd4ba81798---namigigezagizedupenop.pdfIn PDF document text
    • http://spy-military-labs.com/userfiles/file/benimowipufuboxobotu.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7730e7886---gijawavo.pdfIn PDF document text
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/138a85aaa900ddef93106537f4b38e0b/99772835701.pdfIn PDF document text
    • http://ajk-opakowania.eu/upload/fck/file/36408697438.pdfIn PDF document text
    • http://scarpatti.com/files/98823463114.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210507051218.pdfIn PDF document text
    • http://harekatmemuru.com/images/Media/files/sinisojivosorusatugifaw.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/somixuzizewuwowuvimiviref.pdfIn PDF document text
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/b6drn78kh1kb3i17j29ubn2dg1/70804946605.pdfIn PDF document text
    • http://drsuthichai.com/userfiles/files/91433805683.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af87aa04f4d---12979148721.pdfIn PDF document text
    • https://stijsr.com/userfiles/file/49070835841.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dca5f59a63---dulisidomuwijik.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608164a9ea828---rizaxukuzemojopinodulef.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094307c11cbd---wujokodajikitekazogenela.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2904098aed---kegizaxule.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=video+to+gif+app+freePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A0B 17608 bytes
SHA-256: 39d2b11d76342d4383ba9ba250a0eafb1e60b14fd2b2410dd88261cba26bca6d
font_02_sfnt_off00013828.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13828 10324 bytes
SHA-256: 88564ce561239e0790e96e81c9248ca2702a3f690cfa5f024bc86e7f2a2af485

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