Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3f97705e2560255…

MALICIOUS

PDF

90.6 KB Created: 2021-07-06 19:32:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 826d3f0b71aaa219c1f453a5393d7b78 SHA-1: e104d39416a51a319d8950b361859ebe8232b395 SHA-256: b3f97705e25602552d382fb0b3d4250ea2adf8beb33128a47305dc247cd4e552
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous external links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting it functions as a link farm to distribute malicious content or phish users. The presence of external URIs and the overall structure indicate an attempt to redirect the user to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://nomylo.ru/uplcv?utm_term=dealing+with+obsessive+thoughts
    • http://lbhs1965.com/clients/6/6b/6bdd8f708684a1f547efbf97e1630fe5/File/86498672027.pdf
    • http://auto-spec.ca/fck/file/modinasuwab.pdf
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d4fadce00f5---22327479571.pdf
    • https://roofmed.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608b1d4830926---datenapogolebaxadolixe.pdf
    • https://lentes123.com/aym_image/files/38539944923.pdf
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/5ef339e558d380711e52628d06d6c986/luvimadutufidotupo.pdf
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b33ecd7bf2---wubifidisafituxi.pdf
    • http://clinicaveterinariailmarzocco.it/userfiles/files/jimowafijurorewimirofo.pdf
    • https://ksuskalology.com/images/file/31983179725.pdf
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc56e145eb---majovofimu.pdf
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/850b2b627dcda2c6e7fa5740fceeb1af/83662112903.pdf
    • http://fittbike.hu/files/file/43470942029.pdf
    • http://www.oneworldkarate.com/fckeditorimages/userfiles/file/piwatakagotefolunirurejip.pdf
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609005203b883---12931944461.pdf
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5c20d52fd6---95771204585.pdf
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/1e3e4cb4159aa45f74b65d9a1d6193b8/ridogujoriv.pdf
    • http://fzsvybbs.at/userfiles/file/61618592647.pdf
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/5lj50597899osmf9q3qlk2v3v9/bavifunevimoxekefin.pdf
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b27468952a7---ruvixa.pdf
    • http://sirmamedia.com/ckfinder/userfiles/files/57454415979.pdf
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/876d73e2b855cedd13ab25b2c39f4595/43422918087.pdf
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087816e59cd4---kixuwezepapaveboveju.pdf
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609f00b13e960---88242184295.pdf
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/739729accda92f95dfe4dfd62f1f2ccc/pamuxaweselagilirumis.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_off0001013b.bin
4587dbb333c1b74ef327e43c019f0f94d6ba8096dd7fbb044f570a1e83b28f8b
pdf-font-stream PDF embedded font (sfnt) at offset 0x1013B 10680 bytes
font_01_sfnt_off000119ba.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x119BA 16792 bytes
font_02_sfnt_off000131cc.bin
b053f6fd3884fe71584ffa408a76aaff5f3714017bbc390d1226e4c27be641bf
pdf-font-stream PDF embedded font (sfnt) at offset 0x131CC 16892 bytes