Malicious PDF — malware analysis report

Static analysis result for SHA-256 87a64b4f7dfb251e…

MALICIOUS

PDF

82.8 KB Created: 2021-09-04 07:26:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7724440d6d398cfd07589bab59fe821e SHA-1: b659f5f0f7f817763505fc722dbd7551c3836ec3 SHA-256: 87a64b4f7dfb251e1f7349ed7da6d8c1422682d52d526af754d96fc6735e2474
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and a machine learning classifier. It contains numerous external URIs, many of which point to compromised WordPress sites, suggesting a link farm or phishing lure. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates an attempt to redirect users to potentially harmful content. No scripts were extracted, but the overall structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://infrive.ru/uplcv?utm_term=sample+newsletter+articles+pdf PDF link annotation
    • https://sgpropertylawyers.com/wp-content/plugins/super-forms/uploads/php/files/81bf5beabaae3d02cdea7aa7f4e6b064/xifebozibi.pdfIn PDF document text
    • https://soportedevida.mx/ckfinder/userfiles/files/fafogewavalusaras.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611b2bbb2d706---39199732769.pdfIn PDF document text
    • http://gpszone.hu/upload/userfiles/file/17558135288.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e83bc30bd34---vafixofizewegazuli.pdfIn PDF document text
    • http://vodnik48.ru/content/file/tebutajodasuk.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/0c438f9a4393292c5ba04064621fd944/jafivuzuk.pdfIn PDF document text
    • https://nstyapi.com/resimler/files/kokuxawemexorevogugawuwor.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16124e4c88ae9e---gunerojidimijugejomo.pdfIn PDF document text
    • https://cooperspick.com/files/45087246489.pdfIn PDF document text
    • https://perfecthospitals.com/FCKeditor/file/rosuwatirawobibigaz.pdfIn PDF document text
    • http://emanuelarombiarchitetto.eu/userfiles/files/91757504185.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/1322f0b137cd8e756b49df0ef701a604/tunajatifekitosamuzi.pdfIn PDF document text
    • http://americusfelderfamily.com/clients/0/0c/0c5e5e27a4da9db51eb23c24aa0fa274/File/gusagutogufumefefanotova.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/vunafapikuzukapovoxaxidub.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c7aa096fc7a---fezojefunepezu.pdfIn PDF document text
    • https://soft-print.pl/app/webroot/media/files/21731783256.pdfIn PDF document text
    • http://cungcapbaoduongcuanhatban.com/upload/files/73829530505.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/2p45cudv28iat9b2qcms1rq17h/sifud.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4fba0fe7a---pepixikoxa.pdfIn PDF document text
    • http://asianmosaicnyc.com/userfiles/file/zorajixedodepuja.pdfIn PDF document text
    • http://schoonhovensvrouwenkoor.nl/ckfinder/userfiles/files/bigekufegapabo.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/7dbp3tbjpnq6ib28bkqffud9d3/mupidal.pdfIn PDF document text
    • http://zs.tom.ru/jsplugins/ckfinder/userfiles/files/91844481668.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e02b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE02B 10820 bytes
SHA-256: cee9754e1cf6c15b78612f25e769e88f5b1a4f786f0c259bd4f1a6820deb7cd4
font_01_sfnt_off0000f918.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF918 17340 bytes
SHA-256: 0d44b272424724c8fbd971fe1895101210fa248445856f15574f3b7f22dc14a1
font_02_sfnt_off00012604.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12604 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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