Malicious PDF — malware analysis report

Static analysis result for SHA-256 68a72347fa7e4a86…

MALICIOUS

PDF

88.7 KB Created: 2021-09-16 21:03:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d461bb4ab81357d93c5f792b98205899 SHA-1: 727064c9d69dc53c95d71440249f1481b574052b SHA-256: 68a72347fa7e4a86b029826d8313d6524ff995120a8338d04cc19f3c7d29124c
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. Multiple heuristics indicate the PDF contains numerous links pointing to external, often disposable or compromised domains, suggesting a phishing or malware distribution attempt. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing content but likely serving as a container for the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://kehlux.lu/userfiles/files/xonunijufap.pdf In PDF document text
    • https://kocarbonag.com/luutru/files/20637012933.pdfIn PDF document text
    • http://clubselectionvoyages.com/images/file/97243809546.pdfIn PDF document text
    • http://canadianrockies.info/files/file/zivozesalef.pdfIn PDF document text
    • https://s-h.cc/uploads/files/202109132224462596.pdfIn PDF document text
    • https://shoppingplanet.cityplanet.ro/ckfinder/userfiles/files/jipivitopoguga.pdfIn PDF document text
    • http://icsbc.ru/fuploader/file/58342173056.pdfIn PDF document text
    • http://camel-republic.com/media/userfiles/files/mawaxomotixe.pdfIn PDF document text
    • https://kitchensofdiablo.com/upload/file/25557949165.pdfIn PDF document text
    • https://calmoinc.com/upload/editor/file/likasugudumel.pdfIn PDF document text
    • https://dcmheavyequipment.com/admin/images/file/13599426786.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/161319b9ab7c8c---81122650121.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d7360a421d---48659675048.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613d6b249607b---97388486751.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614203e637569---wiruwuxizanasugod.pdfIn PDF document text
    • https://repetitorebi.ge/userfiles/files/dotaxikolozofadudipatur.pdfIn PDF document text
    • http://skkl.cn/filespath/files/20210905012156.pdfIn PDF document text
    • http://antonellascarpittadesigner.it/userfiles/files/boromax.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161333d3bb4d1a---49155491284.pdfIn PDF document text
    • https://diphong.com/uploads/bipuzijixozamadetotutem.pdfIn PDF document text
    • https://allcondosales.rodeodrivecondosale.com/userfiles/files/maxasiperux.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613e9394b9034---sapojijonexafuxixef.pdfIn PDF document text
    • http://cherryontop.pl/upload/fotki/file/nosakefoponir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=share+files+android+to+iosPDF link annotation
    • 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_off0000f171.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF171 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010988.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10988 10524 bytes
SHA-256: d1423f093d0683808d0917d4a43509ca1a2b4ff268bf00f285b13dc650edeeba
font_02_sfnt_off0001215e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1215E 19876 bytes
SHA-256: 558efb6023b6ad1571aff066bb71521ebb6f89060ea1312031bbd16004d17fdd

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