Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8ea52a87589c48b…

MALICIOUS

PDF

87.4 KB Created: 2021-06-28 02:06:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 81379939e3c40b56b5c0a9c69926b395 SHA-1: 6919bfb9b9adb15c67412194e6ad6350922cd23b SHA-256: c8ea52a87589c48b607bd0d09c5012ce902a240d9d3481d583490f350f290228
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a link farm pointing to multiple compromised WordPress upload directories and other disposable hosting sites, suggesting a phishing or malware distribution lure. The document body is heavily obfuscated and unreadable, preventing a more detailed analysis of its specific content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://kopari.hu/files/file/32743894247.pdf
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e767743ad---monatuwoxubosa.pdf
    • http://studiomarcheluzzo.it/userfiles/files/6296333493.pdf
    • https://icbacademy.com/upload/files/10576063416.pdf
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094bf9125985---jujumaruwowijod.pdf
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/3b24612c13c0055857891456e0d8851c/lunedibagujokevigu.pdf
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/2d485121d2218887ac4dd68b6fee9ac5/vutevifitonolusenemojoni.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/cbh0mr1edp0qt0qlsl66pfd1d4/laxagopiguzesaxup.pdf
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606feb557a686---88494874647.pdf
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b260dfac6d3---72635377558.pdf
    • http://nanoscopy.ru/uploads/files/45828826781.pdf
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1e32b01ce---13982817428.pdf
    • http://valeneighbors.com/userimages/76720023676.pdf
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ce18d2f40---moket.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fe87fbddcb---94711128013.pdf
    • http://dailycan.com/userfiles/files/migun.pdf
    • https://inifd.london/uploads/file/70937649470.pdf
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe517584b2---zifoweg.pdf
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/f71a8f6adc10a8e1b847f266f28f232f/titinidobawevemefe.pdf
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1606fab0182585---55298742044.pdf
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/fa5bddfcd161b0b85408ce23cd70b8d7/86727516267.pdf
    • https://rajaunited.com/contents//files/tupodamipiwapi.pdf
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071e0028af50---85198941551.pdf
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/mcnmet6tiomkj71or72vkj1jn9/nanotisiveture.pdf
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608721b548097---78545068129.pdf
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160742f3185f36---65772313498.pdf
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606d537917edb---91452959574.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=you+are+affectionate+meaning
    • 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_off0000f321.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF321 16792 bytes
font_01_sfnt_off00010b33.bin
44f97363bfc067a1d59b943accefb55438dc8e0ea82c52a3a35a1595edf0497e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B33 17376 bytes
font_02_sfnt_off000137fe.bin
a6f44208d00144a61c0536e3048e0ef3cfab7de7ed436ca4345058b95be29011		 pdf-font-stream PDF embedded font (sfnt) at offset 0x137FE 10548 bytes

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