Malicious PDF — malware analysis report

Static analysis result for SHA-256 3af9d7e6fd0ecfc2…

MALICIOUS

PDF

85.5 KB Created: 2021-06-27 21:42:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 304b28ab56972d8b9ec0eca9e0582f85 SHA-1: 92d96d7acafe1e4d4edff563e36aa5115ed8a8d9 SHA-256: 3af9d7e6fd0ecfc2fad3f59233b8d748e4997aa2cfa044a8a23f05be0fe1dfc5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous links to compromised WordPress sites, suggesting a link farm or hosting for malicious content. The presence of external URIs and the nature of the links indicate a potential phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/4e95kls9qudp33uliunelhvsvm/desizesoxiduxavugugib.pdf
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606d02c5e9a7d---bapixedadiloxi.pdf
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160741bb519e99---57635883370.pdf
    • http://rent2day.ca/ci2/userfiles/files/larodupajuw.pdf
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4a76b2358d---fepabo.pdf
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/bil865p08cfeq34jmesnk3pem2/tesuvar.pdf
    • http://neodentpetrosino.it/userfiles/files/rukesotinakibijo.pdf
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c227c868a1e---dexovam.pdf
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/1e5b2e9637e73a5b20f3bf71a267fda3/remivuriwiwireledaf.pdf
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/mpk51mlde0gkbqroihequ5jnf3/52590157213.pdf
    • https://okinawa4d.com/contents//files/6817493223.pdf
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/246b2545dc12df4942fffd2085bceb27/faximuditadumevibobaguzod.pdf
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea5275b29a---67116970598.pdf
    • http://kurpinar.com/img/userfiles/files/vilezesiselokat.pdf
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608f13a70e4e0---22448586012.pdf
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/3a17fd35947c03513979d50ede0bf320/54140552264.pdf
    • http://skisun.it/userfiles/files/mewonawebuvifepim.pdf
    • http://mtlebanon62.com/clients/5/5e/5ee551a8be14a26d7d76bc5e90dd1372/File/58415597751.pdf
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/9mt7lon69i0h925gl7oh4gcu2o/nifivoxam.pdf
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160859a7e7633b---38334983228.pdf
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16089f6b8b09ed---39934069904.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/2ubil9l99jhc85mkfqb56ipu17/34670671509.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=amor+prohibido+frases
    • 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_off0000ea6d.bin
978f0805d36fc8a6bb4e837f5fe4f0abc567aa3dc0b94e8f71fb2ff1d1b0518a
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA6D 10636 bytes
font_01_sfnt_off00010280.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10280 16792 bytes
font_02_sfnt_off00011a92.bin
3477d0ea7dcadf89a7e2348f2f19e28ab146de065b634e24ba8e22a16507d4d3
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A92 17864 bytes