Malicious PDF — malware analysis report

Static analysis result for SHA-256 7748264d8ec20ea5…

MALICIOUS

PDF

86.9 KB Created: 2021-09-04 18:53:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3efe820cd0bffe9fba50132eb5a2f6f1 SHA-1: 9bce5c46baadc44f34dac73558c2ad05b5544c7e SHA-256: 7748264d8ec20ea5e0ec83c7b72bc3d495a38d41b10b1fe296e7553299345636
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by ClamAV and an ML classifier. It contains numerous external URIs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a strong intent to lead users to external, potentially malicious, 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 0.9807

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://krisoc.ru/uplcv?utm_term=speak+now+4+pdf+%D8%AF%D8%A7%D9%86%D9%84%D9%88%D8%AF PDF link annotation
    • http://aiswaryamatrimonials.com/fck_uploads/file/33970250248.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/161123f43f12c4---judunodum.pdfIn PDF document text
    • http://studiotecnicomaglio.it/userfiles/files/86589687298.pdfIn PDF document text
    • http://chalappuram.com/userfiles/file/54630203876.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/67114242835.pdfIn PDF document text
    • http://secretinvitation.net/images/files/46977550342.pdfIn PDF document text
    • https://turdv.ru/SITE/files/editor/file/80831143834.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/b1165dba741bb68b84f182107f7f4429/xinud.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1612d36131ee4f---romogozigawopo.pdfIn PDF document text
    • http://studiotecnicomancini.eu/userfiles/files/22323269566.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/1132730102.pdfIn PDF document text
    • http://halaljones.com/uploads/files/jazurefodegogenowak.pdfIn PDF document text
    • http://liyangah.com/Upload/file/89264497735.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/f6e61250d4b71d158502b79b1bc3b5ed/kokotibupekotilapukalugen.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/438095ff645a10c81f40e4af21aff62b/35656153409.pdfIn PDF document text
    • https://tanthuantelecom.com/upload/fck/file/jikijuzomofesuredolavofe.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609e14830fec9---54187610275.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160aad20df3914---80928738208.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079c42553303---52379116272.pdfIn PDF document text
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/25b6476f0c622466da57f5777f0ac1b0/51372970933.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/bideli.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/68d8hkc83pj0e3nou49jfouq9u/28909055929.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1609e144d651e1---zaforirosuwuxal.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/nkaego3svcve7r4p140s9hcrg5/rigesudadam.pdfIn PDF document text
    • http://ferrocom-spb.ru/userfiles/files/80458767462.pdfIn PDF document text
    • https://questyme.ca/userfiles/file/xolakojolugumafe.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000c782.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xC782 18912 bytes
SHA-256: 2264908f1056053bd6f665b408330780e17afb17a125b2793ca14c9b92548620
font_01_sfnt_off0000e655.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE655 20788 bytes
SHA-256: 013511a53fc8fc81714f5996404ab6d2a13b2c04e231e5e71de2c0a5132abcaf
font_02_sfnt_off00011a24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A24 17208 bytes
SHA-256: 6be1ed53ed35952afa8cf363273ef0e21d7253fd42250511edb339f001295c9a
font_03_sfnt_off000133dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133DD 10316 bytes
SHA-256: 638187d3f0a894216c938bd2148df0286012c6985ba16bbcaf9a46d1b019a98c

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