Malicious PDF — malware analysis report

Static analysis result for SHA-256 6679799db404919d…

MALICIOUS

PDF

69.6 KB Created: 2021-09-26 18:42:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f8a87e0f28fed7473a101cb83bb1397f SHA-1: 798555451da07c1f2d09f424b0bbc7f423b63f22 SHA-256: 6679799db404919dcfea1f6722cb24c2312b7c2e0313fb5abd6f54d8caf8e048
156 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to other PDF files hosted on various domains, some of which appear to be compromised CMS uploads. This suggests a multi-stage attack where the initial PDF serves as a lure to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://sukhonthip.com/file_media/file_image/file/kigapudavolesamopod.pdf In PDF document text
    • http://shiokuda1.com/contents/files/2032393982.pdfIn PDF document text
    • http://elsped.hu/files/file/88974219555.pdfIn PDF document text
    • http://profitoolinfo.ru/ckfinder/userfiles/files/mawezo.pdfIn PDF document text
    • http://dilimkebab.com/userfiles/file/63564257378.pdfIn PDF document text
    • http://gensugroup.com/upload/files/tumezijedexisoja.pdfIn PDF document text
    • http://voijin.com/userfiles/files/73019441576.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/161488a222d6a7---77743022210.pdfIn PDF document text
    • https://zevkotodoseme.com/upload/ckfinder/files/52653797042.pdfIn PDF document text
    • https://xylemleads.com/userfiles/file/94893621585.pdfIn PDF document text
    • https://dobre-akce.cz/media/files/file/3413554350.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/e492a5fe27af14e9f44738bd8684bbfc/87046732108.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/728a47df877ce453967142a27f86b1de/79490502668.pdfIn PDF document text
    • http://nfc.soo.jp/file/36015338736.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/kazepe.pdfIn PDF document text
    • https://ans5680.preneed91.com/upload/files/46835195034.pdfIn PDF document text
    • http://bukharajohnscreek.com/sites/default/files/file/xorixanupakeraxege.pdfIn PDF document text
    • http://www.srijonihealinghome.com/fckimages/file/45225827083.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/rokulelevanezumuzofovubis.pdfIn PDF document text
    • http://asfalon.com/__files/file/69920826349.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6fc536c0b---lakikudelu.pdfIn PDF document text
    • http://tonioloclaudio.it/userfiles/files/29689301489.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/101cdfb6c6aecfaf63a6eccd983732ee/sanakokefevexikebumod.pdfIn PDF document text
    • http://vecsecity.info/editor_up/molakopeginapawuketulol.pdfIn PDF document text
    • http://alpinist.store/sribati/editor/uploadfiles/mukijajuwolij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=fear+michael+grant+read+onlinePDF 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_off0000b29c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB29C 10628 bytes
SHA-256: ff7a35a5b8cde3adcf60b8811ec4a72360a4afa3b227283ffabedafe647fffc0
font_01_sfnt_off0000ca76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA76 14400 bytes
SHA-256: a732e4c7fdc6221cdc4d473ef484a2754698caf617a3aaee3d51696b580bdcfc
font_02_sfnt_off0000eea6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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