Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e50596f866d9fee…

MALICIOUS

PDF

86.5 KB Created: 2021-07-07 02:23:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ab20d1067986dbc7b43ecb4076f9888f SHA-1: 0cd3fbb9ce6a3c22d90aec3744759673a68cd8dc SHA-256: 1e50596f866d9fee2e3fc8389f3b722f94300db057a6ddc1123a48413a3c2d58
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised websites, indicating a link farm or phishing attempt. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this malicious intent. The ML classifier and ClamAV detection further confirm its malicious nature, likely serving as a lure to a phishing site or to download further malware.

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 https://garglob.ru/uplcv?utm_term=concertino+flute+sheet+music
    • http://cwesp.biz/upload/file/difavuvimokutix.pdf
    • http://cybernet.asia/UserFiles/File/40055467715.pdf
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/9c2f1cb674279d3880ed73364f6b366b/65391027250.pdf
    • http://bfr-bialapodlaska.pl/userfiles/file/fefoturarusimilanabubu.pdf
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab73aae2ae---28552179261.pdf
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/pp8jj1vauucp0hf81pqdr8ob44/pazazavemiwugaba.pdf
    • http://nedirajtebosnu.net/userfiles/file/70621339507.pdf
    • http://kazuma.ru/ckfinder/userfiles/files/pomamomaxuditepovus.pdf
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0c6b3f667---62889572097.pdf
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/d2ukcasnmq8muafq34ucmv347n/mavalexukufarejodolasax.pdf
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160860e84ee257---72793497260.pdf
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/49e99d14abf950d5eb671f36757aadd5/lataroxibopafogagamoxuvem.pdf
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608f50de77df3---pesuremulirivalib.pdf
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084bf766ad38---50748240653.pdf
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/2rndpv9chhqu6j9ie3fcruvvmp/6738098154.pdf
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160967abe9cc0a---manojosixemijori.pdf
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6e2df2db4---tenojigobo.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/995d1cfd923497f262256cbfc681ddf3/3145763165.pdf
    • https://salubrismd.com/wp-content/plugins/super-forms/uploads/php/files/3938d1b38b87ee05b5a2b7bd631297c6/satilebafi.pdf
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090bb2541027---26103817891.pdf
    • http://ttccid.com/userfiles/file/31186406561.pdf
    • http://baaningdoi.com/file_media/file_image/file/depasamituvazuxilofelot.pdf
    • http://logo4you.dk/userfiles/file/bedizemu.pdf
    • 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_off0000ef8a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF8A 16792 bytes
font_01_sfnt_off000107a1.bin
82da4885e75df546d3dff411fa71f14acf439ccaf9d311e2fdc4ec4583990106
pdf-font-stream PDF embedded font (sfnt) at offset 0x107A1 10572 bytes
font_02_sfnt_off00011f8e.bin
888759d347a61c50e297d359fa3cbc5a369a3124835ed7a1f0b3bb51b4f77795
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F8E 17240 bytes