Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ad9482e35c1238f…

MALICIOUS

PDF

86.0 KB Created: 2021-06-30 07:55:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 594ab02ee282af9dacf7a2d02f6e6f8d SHA-1: d280d039f4521e588d6ac24c30d24f33b3699c05 SHA-256: 4ad9482e35c1238f8e25f9506d142a6dcf5974b0469c5106b0874efaa3f42775
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The document body was heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://paynechapelduquesne.org/clients/9/9b/9b910c66cef3ae2d1bb1fd5804160a19/File/91103895803.pdf
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/c69ce49076d252ce39f35387e50ca4f3/69510892287.pdf
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/f03014a28c87d75f250ca28989f27660/baxogiliwuvumexemuwuvu.pdf
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607a26911cc38---49237866651.pdf
    • http://bbfrontedelmare.com/userfiles/files/36393177978.pdf
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/qk9srjmsf83j3qr5rm6aik8a30/75572228284.pdf
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a1466f2e5d---lexewoseb.pdf
    • http://tecsun-moscow.ru/docs/file/duvinojopajozawikida.pdf
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160944bf59b94e---91303064293.pdf
    • http://ohana1bbq.com/uploads/files/45937418799.pdf
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c28a8abacd9---pijelinakanebebu.pdf
    • http://pokorny-podlahy.cz/UserFiles/File/34497675598.pdf
    • https://icbacademy.com/upload/files/lagofidili.pdf
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1f7e2af17a---55722558700.pdf
    • http://busankid.com/webfiles/board/file///60203189180.pdf
    • http://imhkayseri.com/resimler/files/jegopitifem.pdf
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/e0ee18350a42de86e08a4863741a8b6e/20838977490.pdf
    • http://dbjhockeytournament.com/clients/f/f9/f9ff496842c877cbb4522510b668f2a2/File/xebixomugafasub.pdf
    • http://mitcostruttori.it/userfiles/files/xewejofinuxedebafogi.pdf
    • http://murphysbeads.com/clients/54316/File/tufixanexoxarofi.pdf
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd9d9b0066---julofoju.pdf
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e2a061f5b---wowubabobetajap.pdf
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097116e21962---joveduw.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=icnd1+exam+questions
    • 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_off0000e8fb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE8FB 16792 bytes
font_01_sfnt_off00010112.bin
71c35a71d3c3f99877a54e12a21499bf85a89098bd5b539fbc79980f1716efb0
pdf-font-stream PDF embedded font (sfnt) at offset 0x10112 10736 bytes
font_02_sfnt_off000119a1.bin
64da19dcf70606954e8ff05b9e6690a15317414322b1e677053c7b546d4243ef
pdf-font-stream PDF embedded font (sfnt) at offset 0x119A1 18100 bytes