Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6298f91e55286c2…

MALICIOUS

PDF

105.8 KB Created: 2021-07-03 14:05:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c57eef338ddb6b523bf49080866ade09 SHA-1: 975386882b41bf3fbd18b6fb2840566a041ebf85 SHA-256: e6298f91e55286c203832461a52a2ae7b98550bc41652f72861367673f2be0c4
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised WordPress sites, indicating it's designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an exploitation attempt, possibly leading to further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9926

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://coretry.ru/uplcv?utm_term=ground+state+electron+configuration+of+c PDF link annotation
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/02dd3786b51fccef489f6a6310553daf/51837874208.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab97155c63---607761051.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607b160b2a221---16392082003.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/da93597cd6a20ba32b1baee24bb7fbac/zuxonemovelevasisif.pdfIn PDF document text
    • https://bnovum.hu/downloads/37308760365.pdfIn PDF document text
    • https://seikico.net/img-tym/files/62406583870.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/bmnehvnfdcu28e920um4qsj707/fewarisavudizotodi.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d683f91d4bd---77032778576.pdfIn PDF document text
    • https://feniks9.ru/ckfinder/userfiles/files/posesevowo.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080f17f0e012---84994966968.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/e9ce1727119902c7d559b00f2cc016ee/diwog.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9224df515---36970284057.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/3e7fa64a6b451179e0e865ee65f04c61/jafivuwatavasusi.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/db5b8799a6dc39136e9f66572cfb4ad5/buxafugepewin.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/e9300b91a73e967fd4920a7e553c2f58/1907987168.pdfIn PDF document text
    • https://carea2plus.com/wp-content/plugins/super-forms/uploads/php/files/fd0ec6cfd16cca5dd89cad4877f4fb77/xuxetaligerutude.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/4292f0da3d9f9a097fd512e1b1115514/93113605745.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/952a1495db6ccd993d3df2cec70c8ee2/60599848185.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/66235792876.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7dc94babfb---zupizitavakesu.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/4et7cm12il1u09qble0ggv2gg6/nibizenofijufejonatibugum.pdfIn PDF document text
    • http://baobianhkhang.com/upload/files/gelonatilufesasogomaxevev.pdfIn PDF document text
    • https://stillwaiting.org/userfiles/file/jesomejenoboruj.pdfIn PDF document text
    • https://rowadalbyt.com/userfiles/files/fufetiderefubafiw.pdfIn PDF document text
    • 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_off00013a89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A89 10788 bytes
SHA-256: eabe0721203d2698df6480055fb9c7825628df36428d8d465aa2a5f3afe9c816
font_01_sfnt_off0001534d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1534D 17628 bytes
SHA-256: dec024f1649c844359492c6109b78986cdf513290210d0576b386e18cf99ad62
font_02_sfnt_off0001818e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1818E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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