Malicious PDF — malware analysis report

Static analysis result for SHA-256 92c1bd0984c5630d…

MALICIOUS

PDF

101.0 KB Created: 2021-07-06 23:11:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 8d4d0a8751accd3def1b0f3ddf7ecf84 SHA-1: 733b554fe50e4bded2bd36fdb36a8c223d080f6f SHA-256: 92c1bd0984c5630d2a86265049c5e10c415b7e3f9eec9a2112f0db0d09ccf6c6
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The `utm_term` parameter in one URL indicates a potential attempt to disguise the true purpose of the link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

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://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/uvoefv0f3fu1l7revmkfhk8pha/tulixavodelevejalow.pdf In PDF document text
    • https://open-call.fr/uploaded/files/sezajojunatamutaripiguf.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b0ed126fe03---49265928318.pdfIn PDF document text
    • http://yakutiaprime.ru/SITE/files/editor/file/pakesibevaviv.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/8953adc4a49a1ccba278364de77ca484/78940333520.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/ac2c5feb685749a9eb4b51dd9387a5ef/68937529354.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/3874cd3b899e272aa3816a049245b27c/92020653483.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/34bc8276884c633a0a2786396925b4a6/pejomavidekejutavag.pdfIn PDF document text
    • http://kup-vino.cz/web/ckfinder/userfiles/files/mupitonejuvelubizupona.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/gemekajo.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/93632100e9858086cdf6b6af23dbef11/27140972715.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/55174f7484706d49e513a825afc0c832/564287363.pdfIn PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/32u3hgog7qi50qnccnaq4u59pt/61724798722.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a2d8a5e18e---rolodatovunemaxole.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ccfd4a9e2ff---ruxatoreranatese.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/c62819aa069c3858c685dae7e47e5ec7/85486621.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/ffcef4ba8ca4bf14e9c1bac6637e116b/24513703969.pdfIn PDF document text
    • https://glbtrader.com/userfiles/file/raxupuruzixititibofiretav.pdfIn PDF document text
    • http://kfbi.ru/content/file/wuvikobifojot.pdfIn PDF document text
    • http://salkim.com/userfiles/file/bujuropoloxel.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/ovva2jchi541prh0dbuo1v26e5/nikexodimujomof.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/49798543917.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/nlg4a5rectp0gu7m470fo2kpp2/fowedarovepotadujakejore.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=rooter+unlimited+coins+mod+apk+downloadPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011097.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11097 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000128a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128A8 16092 bytes
SHA-256: 9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd
font_02_sfnt_off00013dee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DEE 10996 bytes
SHA-256: 06caa6178cc8cc85f885db29d88ff297c9e63fde5e26a4bd8e1c764c7c60135c
font_03_sfnt_off00015782.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15782 17784 bytes
SHA-256: cc827b7ddd35ca22a8bc700d0116349f71119fab959176ed3f3d00552b4d2597

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