Malicious PDF — malware analysis report

Static analysis result for SHA-256 729d7bd0b73db634…

MALICIOUS

PDF

86.5 KB Created: 2021-06-27 07:09:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1782501db9def5b6bd7bd250c0e9cd4f SHA-1: 962e187417289b0c77f34982152ccc085519a066 SHA-256: 729d7bd0b73db634c18f24acf9d0916a62ff83a0741f629d069bca4ed4994ddd
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links pointing to compromised WordPress upload storage and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, likely serving as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://beerskiboot.com/img/upload/file/dikazusura.pdf
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/dfd5a514520dbaff89e35685744e3070/zadugizig.pdf
    • https://alshamiltrading.com/alshamilfiles/file/jirarumeduvumepob.pdf
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607da66dcfcd0---lirebagakolewotoseguvinep.pdf
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086cae52709e---xoxizi.pdf
    • http://sosnovgeo.ru/userfiles/file/ruguzubaxur.pdf
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5b778b6f41---46255523133.pdf
    • https://skvely-kup.cz/files/file/suxexaruvobalezi.pdf
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf6dafd1adf---pekogu.pdf
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bcac1f4acf3---89882924468.pdf
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd8ae3d3292---86567480965.pdf
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/vqadolqopbp5p7d3pmq9tuooak/17636918415.pdf
    • http://grupopiscis.com/upload/files/24068845143.pdf
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c92b66656b2---xuwapilop.pdf
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/dhtppfd5om55536k79thrgqn0r/12033954607.pdf
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1606f17883ace0---minovojidotof.pdf
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c157a024765---lisunazeripanuxuf.pdf
    • https://qqhanoman.com/contents//files/15637833304.pdf
    • http://pvhs1967.com/clients/a/aa/aa78cb05297cd93d8a9ab6bd1eb8a3c4/File/kegodipasaxexojap.pdf
    • http://ordineveterinarivenezia.eu/userfiles/files/26805373373.pdf
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/lv0kdqvpkf07mnc91coi5ebsd0/94293262572.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=what+makes+a+lake+turnover
    • 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_off0000f16c.bin
9399762e639a6bd667e7c626106f30b94723bd0bdbd4f0556e51d937c664925d
pdf-font-stream PDF embedded font (sfnt) at offset 0xF16C 16780 bytes
font_01_sfnt_off00011cd5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11CD5 16792 bytes
font_02_sfnt_off000134ec.bin
f462d2ec5d24f15a59adcf960162b4d67ea09f95819228788112bb2e008d724d
pdf-font-stream PDF embedded font (sfnt) at offset 0x134EC 10532 bytes