Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1683bf0c9dfe17f…

MALICIOUS

PDF

94.4 KB Created: 2021-09-08 03:28:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b1159e7798acbe7bb13258d5deeaf89c SHA-1: b3a2bd638ada5a6b0d64b6419754a867da3c21cc SHA-256: e1683bf0c9dfe17fd82fea59990b3e133a0cd364f34e0a3709c45274cf92cea3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external URIs and links to compromised CMS uploads, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of multiple distinct hosts and UTM parameters in URLs further supports its role in directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://garglob.ru/uplcv?utm_term=tratamiento+para+entamoeba+coli+quistes+pdf PDF link annotation
    • http://deltools.com/userfiles/file/xipawominopidaruzegobibo.pdfIn PDF document text
    • https://rosewoodcity.org/nbloom/fckuploads/file/xalemesilogew.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160d228f6b99e1---gerur.pdfIn PDF document text
    • http://ok-poland.com/userfiles/file/83735165721.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160707f474faa3---41293198862.pdfIn PDF document text
    • https://thuaphatlaihanoi.net/uploads/files/kopupubuluvugima.pdfIn PDF document text
    • http://nanumed.ro/uploads/files/87913429639.pdfIn PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/1346878089.pdfIn PDF document text
    • http://heaig.org/editor/ckfinder/userfiles/files/38259263189.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/8auvps81vr0eupi4c3ofel3fgp/zimegogifagu.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e840b6c4fb3---83450915109.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/1bb9110495a70a72ed30772cd01b899e/20915511970.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611d4f9009124---1286602853.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096aa3d7611c---zawimubekadosivogitokoti.pdfIn PDF document text
    • https://arhometutor.com/userfiles/file/mijuropowizuvego.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/e6f2c8cf903eec084879fc8988165ebe/54350597537.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f4070f991d3---juzesodopek.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16088dfa870af8---74409370983.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/3a40aecb655e73e9e5e8b659f7563589/mukegeva.pdfIn PDF document text
    • http://cdseoulps.com/uploadfile/fckeditor/file/21265905995.pdfIn PDF document text
    • http://psychoterapia-przemysl.net/img/userfiles/file/ruwifiluko.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/lt3fa0qifk2qn6p42gehgn87ef/bepeki.pdfIn PDF document text
    • https://www.webplease.it/wp-content/plugins/super-forms/uploads/php/files/a6ldmnu8nd6079rdv9ltr1l994/16697612217.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160844b333deed---lemuxajivojevojasanokafi.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_off000104de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104DE 11132 bytes
SHA-256: 767a4d4e27b562abbb73bf88fb831821b99ac2b404bf2d9ce60f05e9d326a45c
font_01_sfnt_off00011e60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013672.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13672 20080 bytes
SHA-256: b459665e18cc545c0bb9bb7c7db6cb6a5dc643c93d2459bad9127e476015afe1