Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8778fb8f14d3024…

MALICIOUS

PDF

81.3 KB Created: 2021-09-01 12:10:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: efe71483e9c29ea4b6ad06b47d87598f SHA-1: 296588447f5bea9a6ccf9774e65f4b78cf9d01f9 SHA-256: a8778fb8f14d3024eb298a2a3b0f406806e577980dbe3328d03bce22595d5720
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites, suggesting a link farm designed to distribute malicious content. While no scripts were explicitly extracted, the nature of the embedded URLs and the 'link farm' heuristic indicate an attempt to lure users to external malicious resources, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a840a131c37---bufimolakewozinani.pdf In PDF document text
    • https://betenenergy.com/sites/default/files/file/gotexozus.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce2f81ccf5---79661375787.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/27f793a471fd476abe04f82d9577feab/januruxisa.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea0307cf3c---laxomawugisesof.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/phk47oo3b3bk1piks33ikvm02c/70633390294.pdfIn PDF document text
    • http://www.puhito.hu/uploads/3152433561.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160713bae54097---xopit.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/8127334812.pdfIn PDF document text
    • https://e-tta.com/app/webroot/userfiles/files/zetekoselolatifoneg.pdfIn PDF document text
    • http://sacmacbook.net/userfiles/file/lofenabudamanurited.pdfIn PDF document text
    • http://massimomoroni.it/userfiles/files/55243078100.pdfIn PDF document text
    • https://kme.pl/global/app/webroot/uploads/file/16275859202709.pdfIn PDF document text
    • http://keralastatetailorsassociation.com/userfiles/file/geniguxejubapogofeva.pdfIn PDF document text
    • https://hglobaltourb2c.com/FileData/ckfinder/files/20210702_1BD3BA498950A8AF.pdfIn PDF document text
    • http://uleshuzatshop.hu/files/file/38595560775.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aca678da837---sadumetibigutimud.pdfIn PDF document text
    • http://sh-songshi.com/admin/upimg/file///81805987129.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160daa36d83cf5---mebokegezujor.pdfIn PDF document text
    • http://recrute.fr/files/files/88002024930.pdfIn PDF document text
    • http://kelvista.lt/images/files/49442586465.pdfIn PDF document text
    • https://aonetreks.com/uploads/file/zajozodejetuwotuwow.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607b8c5f7a130---89752210331.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608370676b499---29425288807.pdfIn PDF document text
    • http://landbondcorten.com/attachment/file/7672e19165912790a33ccd7eeec790a4.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=feet+scaly+and+dryPDF 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_off0000dc93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC93 16960 bytes
SHA-256: 5463f302a6465c0accdf03eed1e83c97ee43a1d88ee00bae77cbb67b6d846a7f
font_01_sfnt_off00010870.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10870 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012087.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12087 10240 bytes
SHA-256: 82080b3f07f09a99ac126e4ff9361dcd871857933ec97d66b080bc567c7ddfc7

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