Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7250fcc00a42f76…

MALICIOUS

PDF

82.9 KB Created: 2021-06-25 22:45:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7b9e44ca6fa10213db2bf2a072ef8274 SHA-1: 8b16e64e901036a381f19d53e78bb63da379ee72 SHA-256: f7250fcc00a42f76bc5e99001bbe85983ebe3a2be75e6462830c5220f152be8e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised WordPress upload directories and other disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links. The document body is unreadable, but the heuristic firings clearly describe a link farm designed to lure users to malicious content.

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://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/6dbe3077db338e8ef5ccad3bffca2a58/tevamunudiparuxosukotejez.pdf
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3171f68700---ramuwezavurijusedano.pdf
    • http://bogelaipigeon.com/upload/file/vuwivorubij.pdf
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160983004f2c3f---89583541947.pdf
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f504f3e4ff---85254155495.pdf
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607838d2db8e5---48903706343.pdf
    • http://mdbim.pl/ubezpiecz/obrazy/file/96714682355.pdf
    • http://riverbendhay.com/clients/4/4e/4e1cbd84181290ddb66fb035c9950ff6/File/26574214750.pdf
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/bace3cc8c8ab829c7f3add67757b3483/50768068820.pdf
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/8b587fc6209facc0caf4ee7ac23c608f/genopamizumin.pdf
    • https://flardochform.se/userfiles/file/69231488411.pdf
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/fat9gsejo388m4rtlogfsgj2n4/livafawesedamuwabaxomeb.pdf
    • https://apoiotelecom.com/imagens/img_fckeditor/file/71826774794.pdf
    • http://modnyi-buket.ru/uploads/files/vopavudu.pdf
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160856097240a6---46811141166.pdf
    • https://otartufo.com/ckfinder/tartufofiles/files/mevebixerozafiketoral.pdf
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/b72329a2cbf3361adcfde1f6b6aa5237/45659112678.pdf
    • http://homeopathyhongkong.cn/files/wewadazoje.pdf
    • http://steps4cancer.org/clients/a/a7/a78c374070a178914b502abaf3db82b8/File/61258591342.pdf
    • http://lukoilmarine.com/ckfinder/userfiles/files/45723425630.pdf
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a4046c6810c---dojekimixamavowugo.pdf
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f746e445e2---disulofag.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=topology+point+to+point
    • 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_off0000e648.bin
d118be52584f5e5f2f922020c19eeaf8cc5361c8c9f68f5f8cb7529cd2d8dff0
pdf-font-stream PDF embedded font (sfnt) at offset 0xE648 16272 bytes
font_01_sfnt_off0001103e.bin
e4ce7f0685806b86fccaa55940f831da472b7c7e0744cfb6e536c7d082f88970
pdf-font-stream PDF embedded font (sfnt) at offset 0x1103E 9940 bytes
font_02_sfnt_off00012652.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12652 16792 bytes