Malicious PDF — malware analysis report

Static analysis result for SHA-256 15c283bfc9591d04…

MALICIOUS

PDF

83.4 KB Created: 2021-07-02 18:56:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7fb3cadad3b4d88b92469c756c9433f6 SHA-1: 0f8add4b4c5159b50d40e6360b907250114159c8 SHA-256: 15c283bfc9591d04f72c6dcf8162084ce833c889604454c122f2ecc4d76ea309
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to numerous distinct hosts, many of which appear to be compromised WordPress sites used for hosting PDF payloads. The presence of a link farm suggests an attempt to lure users to external malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/ochb6b7b9hslv27bi6c53l12em/kezubilarasoxavataxu.pdf
    • http://alexandraharris.com/clients/36054/File/wepag.pdf
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8596b235c6---50147043570.pdf
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160944023cd511---wekora.pdf
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a84f827ae3e---somez.pdf
    • http://infrabud.eu/fckpliki/file/felugesurutegin.pdf
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160ac88977abf9---75186987379.pdf
    • http://immobilieninvestors.eu/userfiles/file/tofov.pdf
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/9eac54fd352a47fc3bc77fbed3804dc2/71030012365.pdf
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/mjp4iebjhohcrnd696jlsdp7al/63893248603.pdf
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b460ed50d1f---17422206824.pdf
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/rjerkbo9qv3e62jnla4plmvu9g/24907323488.pdf
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f6c77cf88---juwoterigidatomivu.pdf
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/59101789239.pdf
    • http://westernmaki.com/uploads/files/fibuboxolilugu.pdf
    • https://gea99.com/ckfinder/userfiles/files/biwapozasodad.pdf
    • http://diclenakliyat.com/userfiles/file/dogezogagoxapabiwosotad.pdf
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b96dd3a446---11567113241.pdf
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/srk18een46k20bvg9qkbb8vd10/50805494804.pdf
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160964ac611e82---58776192971.pdf
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/qkgvo24ob9kjbdc07ngk43ipv3/75354991759.pdf
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0c96fa662b---dinugufiwekizunenuve.pdf
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/6b4e77ab7950a2641e8389e119a4fb74/28603605927.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=iah+to+yyz
    • 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_off0000e58b.bin
db18b0a491017fbd7845293bb483e8f140eccea72a5b53129a5937eda5425269
pdf-font-stream PDF embedded font (sfnt) at offset 0xE58B 17476 bytes
font_01_sfnt_off00011352.bin
8f92d8a76641c101bb7e6313b07bd7fd8551ecb79077bce7ea1693e9b3bf82bb
pdf-font-stream PDF embedded font (sfnt) at offset 0x11352 9688 bytes
font_02_sfnt_off0001289a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1289A 16792 bytes