Malicious PDF — malware analysis report

Static analysis result for SHA-256 d83c47fb30ff050e…

MALICIOUS

PDF

93.2 KB Created: 2021-06-25 23:23:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 755fc5c2cc0e62ba43376b3b31a8eacb SHA-1: cfcf0b8124d1caeaff689c60ad34b84dec41eee0 SHA-256: d83c47fb30ff050e61210fae6521b934b4742b06996ee97b6116e2e926f72dae
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites. These links likely serve as lures for phishing attacks or to distribute further malware. The PDF structure and embedded links strongly suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7t27vk6p9o5drisdhme2juhj32/wazojoridok.pdf
    • http://urduhadith.org/survey/userfiles/files/95971981772.pdf
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160acc23064b11---nesobolenubem.pdf
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607d67cf3f72f---17913680088.pdf
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/ql7c4shkdu1r1j0rpahtcb8o82/80000998159.pdf
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ae06d6a5fe7---robatopovavitexebosor.pdf
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/779a4847595891366c6cca82240cab21/36804130779.pdf
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/9d1b864cca3663908a4ce89106a0af32/77611840949.pdf
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160caaa6bf2a24---38142139592.pdf
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/d023894caf4824e7e16ef18a6f82faca/58264454011.pdf
    • https://www.reflectionuk.com/wp-content/plugins/super-forms/uploads/php/files/77mso4ga447ak2u3tj6q6d3spk/lovozedetawut.pdf
    • http://antifftech.com/uploadfile/file///2021051517153956.pdf
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfa6380956---34434529720.pdf
    • https://steklo-shik.ru/userfiles/file/subugenana.pdf
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/0757bdf00f81c15b6cf01dbf0ec586bf/23009674019.pdf
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/ca0d84028bb386380faeb45a8d32b5c8/52003382581.pdf
    • https://foulardfotografando.it/file/53865483205.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/oerdbkl1fkaabbp0mcir3jr6h6/69026881743.pdf
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16074344ea6819---86123156678.pdf
    • https://rainbowfurnitures.com/files/files/21347521727.pdf
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/ldvvbmbiuaam8sikv9q8irq1i8/nowoxutof.pdf
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/2qhvtjebimfgfcpu1d5sn4vrs2/tigezubunibedubixe.pdf
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/9059945e434c777de20d86f60064e4d8/61186061257.pdf
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/19c45ba666a29ccbe99dc8b46d65d608/13702797610.pdf
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608d6a754e83e---66172128745.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=why+are+fossil+fuels+a+nonrenewable+resource
    • 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_off0001093e.bin
15da48db722c18840511a3714663b2df48383f1c811aee9f20fd64c1e9b2e456
pdf-font-stream PDF embedded font (sfnt) at offset 0x1093E 17140 bytes
font_01_sfnt_off00013655.bin
3907cecc8ceeee1d6928d851716dcc54abf5a8ef44fce32a814e16944b00884f
pdf-font-stream PDF embedded font (sfnt) at offset 0x13655 10768 bytes
font_02_sfnt_off00014f1e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14F1E 16792 bytes