Malicious PDF — malware analysis report

Static analysis result for SHA-256 641bbe9652192ad1…

MALICIOUS

PDF

80.7 KB Created: 2021-09-11 12:43:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 20bcddb8a222d79af5bf208217b2cdc7 SHA-1: 8b3ec02c809cb3d031fc8b591b61fb9da7c6f3bf SHA-256: 641bbe9652192ad14062ae4dda1e9e7cd07e4fcc9312bcb462a64b4efe4cf9ca
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://vyrukrc.lt/userfiles/file/mekirobumupewoketad.pdf
    • http://iamsong.vn/uploads/files/kakefemopipamig.pdf
    • http://abwferrellpkwy.com/uploads/files/kevoxagage.pdf
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16130733613bad---wojezuva.pdf
    • http://rklatex.com/userfiles/file/55719380134.pdf
    • http://www.facyt.com.ar/ckfinder/userfiles/files/pujawexe.pdf
    • https://skillmapmagazine.com/ckfinder/userfiles/files/xemalivunaso.pdf
    • http://mosme.org/uploadfile/files/genodelazuvafivosed.pdf
    • https://rhuyscampingcar.fr/images/files/xaxisexuz.pdf
    • http://silesiacapital.eu/data/file/98662616821.pdf
    • http://sportsgarten.com/editorData/file/vipapinebonejosipegat.pdf
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/377a9e689d724235d796109677d561f9/30128703180.pdf
    • https://ip-kamera-rendszer.nuttydog.hu/ckfinder/userfiles/files/tonukidisorigexid.pdf
    • https://pingthye.com/userfiles/files/3684109588.pdf
    • http://sushistoryus.com/uploads/files/robuvewenigomexiwago.pdf
    • http://epilia.com/upload/FCKEditorfile/5502935901.pdf
    • http://alfonsoguiggiarchitetto.it/userfiles/files/23386824814.pdf
    • http://unite-chem.cn/upload/files/12084130340.pdf
    • http://salman-is.com/userfiles/file/63101474578.pdf
    • http://cjcounsel.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/debena.pdf
    • http://seoaudytor.pl/userfiles/file/16393643212.pdf
    • http://pusancard.com/userData/board/file/mafifewavixuwus.pdf
    • http://kristiankutschera.de/userfiles/file/38447141647.pdf
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132a9660565e---gavox.pdf
    • http://www.bash.cl/media/file/luragokaluroforazopezone.pdf
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161300bd3ab2a0---zurok.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=anime+fox+app+for+android
    • 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_off0000d7a0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A0 16792 bytes
font_01_sfnt_off0000efb7.bin
6c2d097a020279f0c86d082c7b394df19dcac57af9205c417c7f0b1860e1fcb5
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB7 10432 bytes
font_02_sfnt_off00010749.bin
0891c670555fbf5d96b7097a2a2fca6f32187e78f2d594662ea136ea7f26ec54
pdf-font-stream PDF embedded font (sfnt) at offset 0x10749 17780 bytes