Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ad6b36cb381dee9…

MALICIOUS

PDF

85.1 KB Created: 2021-08-15 02:17:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b0ef4692cc8f8159e488286f3e68137d SHA-1: 8456d9584a57888cc0632a859b119049bd9af3ca SHA-256: 3ad6b36cb381dee9672cf23592db410f4873a224f4f8a7fca52b86304e3bc735
164 Risk Score

Malware Insights

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

This PDF was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to various domains, some of which appear to be compromised or disposable hosting. The presence of 'SE_INVOICE_LURE' suggests a phishing pretext, likely aiming to trick users into downloading further malicious content disguised as an invoice or payment document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://styropapex.pl/userfiles/file/gikifetuzu.pdf In PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/hlulpkq0b51q280dck92ovjmdf/penelapu.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/bcsr5f6i0rb5ug1t1a8djmqnas/kafezotikefijudabatikaraz.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160960c9eb0833---difoxetil.pdfIn PDF document text
    • http://plncse.hu/php_data/file/88324089981.pdfIn PDF document text
    • http://ferramentabelleggia.it/public/file/nenaje.pdfIn PDF document text
    • http://maasmartcity.com/userfiles/file/86680420930.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/4k621rtop3d8pnqm13iqf8hu4n/27417659127.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb9019168f---41714609039.pdfIn PDF document text
    • https://hijaulumut.com/contents//files/14757601147.pdfIn PDF document text
    • http://drsuthichai.com/userfiles/files/wijupatifawukaxowatox.pdfIn PDF document text
    • http://timebank.ru/sites/default/files/photos/pagefile/70358887823.pdfIn PDF document text
    • http://architettobotteonpierpaolostudioabacus.it/userfiles/files/duzoweketadil.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608454bfbfcd9---66189718640.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c9c05a0ddb0---2584995164.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/69564019926.pdfIn PDF document text
    • https://cmflower-kkc.com/ckfinder/userfiles/files/87574633605.pdfIn PDF document text
    • https://residenciasanamaro.es/userfiles/files/nuputum.pdfIn PDF document text
    • http://lawrence-spruill.com/clients/42275/File/76022469997.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/69ef963b4d0844b2037f5c3f8c4f19f0/5953091992.pdfIn PDF document text
    • http://footstepfloor.com/upfiles/files/84975354829.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/92959945907.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/pisobajamosagitumotila.pdfIn PDF document text
    • http://fzsvybbs.at/userfiles/file/sevav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=demurrage+calculation+sheetsPDF link annotation
    • http://louisiana-arts.org.s150269.gridserver.com/siteuploads/editorimg/file/61131492573.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_off0000e663.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE663 10776 bytes
SHA-256: 087c6303894467ef9db101cc67b7aa6f4964ff34bb3f37f78ae8bd3cd2a55eb3
font_01_sfnt_off0000ff01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF01 17704 bytes
SHA-256: da3747cc9d3d8962f3d19ab3d7a3a1fcbf1bfffed3a0bb6c0a0c868c1d9568d6
font_02_sfnt_off00012d9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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