Malicious PDF — malware analysis report

Static analysis result for SHA-256 d82e21f73251ba88…

MALICIOUS

PDF

73.3 KB Created: 2021-07-05 02:49:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1d56122c71f0e7fe6dd62372c5bad246 SHA-1: ca54a2556b662a4c45ab07ee7885037336133a3a SHA-256: d82e21f73251ba88e80327d4a31a770742f396c1a61263e9e9edd6e81b5e788a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains a link farm pointing to multiple compromised CMS upload directories, suggesting an attempt to distribute further malicious content. The presence of external URIs and the structure of the PDF indicate it is designed to redirect users to potentially harmful files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f36f7c9cd8---44774136582.pdf
    • https://amursvoidom.ru/media/files/nakokenunobavimapesa.pdf
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1609025e0cd164---14904303918.pdf
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/3e7df1c6f45a4e689af911c0e25c0c68/fadikisibevezive.pdf
    • http://amtutoring.com/clients/865321/File/lisegewufajizokow.pdf
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/80e334ad06328a52a0739739bea6a47f/zojesa.pdf
    • https://calmoinc.com/upload/editor/file/segiwonimuzulisoxus.pdf
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b77168cd466---58246316439.pdf
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c045356f36e---51974218883.pdf
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/187t85mp12e5e1hqgasceosqp4/98395325342.pdf
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/f55011e8c2da0728f71d5cf2b0aa04a5/6684810826.pdf
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608366607ef79---goxamewubalepaka.pdf
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/9a1fd104dd8445515d38815d81b305a3/vabuwimavuzuvibol.pdf
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/7f215f0c8f5a104d7d6e40bd3f9db9b6/wetujujagusutemisanoz.pdf
    • http://eko-inwest.eu/upload/file/35121393754.pdf
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/pcasb451h8jimfog9jt4sk2q3d/60509044313.pdf
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160963baeb9bf3---91178377494.pdf
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/hhsvpgg8b96lbh98oe690aqh70/bikawarotazekad.pdf
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c9c3bb3b346---63761673565.pdf
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/gbstjg68ekdrkgiusda0in3i5l/navikuxuperumolaxut.pdf
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c3286f8575b---kabiruwo.pdf
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c60eba66d5---tagajobolodukefa.pdf
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/2440d6ce660a0267d6be7937fb660846/tewijutitezinimog.pdf
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab77dcc840---lobikeveromag.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=words+that+rhyme+with+you
    • 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_off0000be2b.bin
bcf0b26c7247d2bad8bce16e1166c15462598236b07627d8d333b434cae71437
pdf-font-stream PDF embedded font (sfnt) at offset 0xBE2B 15492 bytes
font_01_sfnt_off0000e5c0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C0 16792 bytes
font_02_sfnt_off0000fdd7.bin
7572c384a48956011b2df088e493fab65107b20eac34fe6678c1dfb13da247de
pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD7 10656 bytes