Malicious PDF — malware analysis report

Static analysis result for SHA-256 d88148686de13b68…

MALICIOUS

PDF

84.2 KB Created: 2021-08-20 10:03:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 29079e26f77a4747219c0028f9d99660 SHA-1: 9cf7040e57b1be2f4262f7f6167a93923da6e8e9 SHA-256: d88148686de13b6815ccce45fb0867a8a20a14c0280b32b7020eda6d83624358
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to delivering a payload or redirecting users to malicious sites. The presence of external URI links and link farms further supports this, aiming to obscure the true destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://infrive.ru/uplcv?utm_term=adobe+acrobat+reader+version+5.0+or+higher+free+download PDF link annotation
    • http://fluitec.fr/ressource/site-image/files/95843033353.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/848388eee30daa4da7f7c5b057d9052f/jugewipimi.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b4bff57d223---93419269087.pdfIn PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/97070126809.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210607041043.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/358ee683cf97baf4eff54707069341da/93606996202.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/62533322599.pdfIn PDF document text
    • https://gwynharmon.com/home/gwyn/public_html/ckfinder/userfiles/files/kaduvalepaselenigubawem.pdfIn PDF document text
    • http://alexandercdg.com/clients/36029/File/14422915042.pdfIn PDF document text
    • http://xn--9d0b102a6wc3y4a.com/sa_upload/userfiles/file/20210708025533.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/e5df785c79f254fd43a3fa962868c365/22549647876.pdfIn PDF document text
    • http://studiosiriosrl.it/userfiles/files/97468931220.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b42a947ceda---kiralajavedojorad.pdfIn PDF document text
    • http://rolmech-strzelno.pl/Upload/file/vofekabumadepop.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160853a4bccf16---29915294446.pdfIn PDF document text
    • http://hasyo.net/files/file/76009700712.pdfIn PDF document text
    • http://brilliantsolarpaneling.com/userfiles/file/86588915207.pdfIn PDF document text
    • http://themadthinker.com/temp/vinney/HTML/userfiles/file/25247851422.pdfIn PDF document text
    • https://ytdrive.com/CKEdit/upload/files/7144063518.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.fr/userfiles/file/76321247998.pdfIn PDF document text
    • http://ipmarketing.net/userfiles/file/12345090715.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/df5142ecc82e85596d608ad60db3bbc9/58685887466.pdfIn PDF document text
    • http://didaconcept.com/admin/fckeditor/file/tuxokitejanun.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/6a58360aea4a91d839c044e933a7b826/49190406958.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b779157cc62---19732566450.pdfIn PDF document text
    • https://tsegypt.com/file/migutuledirifuveja.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_off0000e223.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE223 17472 bytes
SHA-256: 0a4a64b86bb5110227f187e26ce56fcc60a4a05b566e6386bff26589e510e2b1
font_01_sfnt_off00010fe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE2 11348 bytes
SHA-256: 7f43db6f05653b2b499d4c854f7a96fd9a022f64b53610fe4a5f1cb11d6615aa
font_02_sfnt_off00012a6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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