Malicious PDF — malware analysis report

Static analysis result for SHA-256 941754d35507743c…

MALICIOUS

PDF

81.9 KB Created: 2021-09-17 00:17:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 3d52b392443f0420fb2b0055c4aa61e6 SHA-1: 41b5ead7a97137b600d856591c7b060a838220f7 SHA-256: 941754d35507743c612cfecba8b6f17db3e1fe46087f243586db6a347be1d6ed
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs, many pointing to PDF files hosted on compromised WordPress sites, suggesting a link farm for SEO manipulation or malware distribution. The presence of these links indicates an attempt to lure users to malicious content, aligning with phishing and exploitation tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://medvor.ru/uplcv?utm_term=www+web+series+movie+download PDF link annotation
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/62b598e14c37b02314c6f96a380e5783/miriruwev.pdfIn PDF document text
    • http://ventexevent.se/uploads/file/13563825997.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/14240406568.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133c0c8c7691---kijerokofodotisizuse.pdfIn PDF document text
    • http://asacnfservices.com/ckfinder/userfiles/files/14882811577.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161434b356443c---magelojipegasuboxoki.pdfIn PDF document text
    • http://ekmeta.lt/failai/file/89835619415.pdfIn PDF document text
    • http://veoguidecostarica.com/ci/userfiles/files/55091915850.pdfIn PDF document text
    • http://goldmustang.com/files/files/likijavigunewino.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/84874655252.pdfIn PDF document text
    • https://pro-biomed.com/admin/userfiles/file/4454804659.pdfIn PDF document text
    • http://cameranichietsu.com/luutru/files/ladewikasufoxuzefebigi.pdfIn PDF document text
    • https://sanagustin.cl/files/ridupoxavukutam.pdfIn PDF document text
    • http://thepokewave.com/uploads/files/36539253956.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/80000462066.pdfIn PDF document text
    • http://precisao.org/files/files/4062966121.pdfIn PDF document text
    • http://www.moyekolodin.com/files/55588099002.pdfIn PDF document text
    • http://www.heksan.com.pl/file/69598934188.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16132161bd9e5a---sejabusuwej.pdfIn PDF document text
    • http://hstairan.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/vefumuludubesitamolu.pdfIn PDF document text
    • http://naitikfashions.com/ckfinder/userfiles/files/rutoturoxiluzujukowipaf.pdfIn PDF document text
    • http://coreaad.com/DreamDataUpload/file/kuxivup.pdfIn PDF document text
    • https://suruburi.net/mm/file/bixazofigivena.pdfIn PDF document text
    • http://naturestuff.nl/siteimages/file/zajekofulon.pdfIn PDF document text
    • https://mediaget.com/userfiles/files/kaverikovefopenevowit.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_off0000dc8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC8A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A1 10596 bytes
SHA-256: 896e3d8ae2239f76a76fb81aeaab103e6d6284f9e794989a36c96c26f3e11462
font_02_sfnt_off00010ccf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CCF 17564 bytes
SHA-256: ee3b72cac68d98e4cb5adabe06e7f1e23e38e37362d3d49ba35216967548c173

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