Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad00698ab78c60c7…

MALICIOUS

PDF

185.3 KB Created: 2021-09-04 05:01:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6886be804ec93fb4aaab99b803ce35a8 SHA-1: 7a43293d11c6caf237994a37c71b4c11106d07be SHA-256: ad00698ab78c60c79e9e860370099ae00db8f7ef1a9bca10cfe33bdff40a4b78
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to disposable hosting or compromised CMS upload directories, indicating a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with techniques used to redirect users to malicious sites, often involving embedded JavaScript.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://allytemp.ru/uplcv?utm_term=edit+pdf+android+reddit PDF link annotation
    • http://tercovci.cz/files/file/70646998543.pdfIn PDF document text
    • http://allmedicus.com/userfiles/file/felovebozej.pdfIn PDF document text
    • https://xn--b8qxb801j.tw/upload/files/73735553317.pdfIn PDF document text
    • http://palmdale.thepokeluau.com/uploads/files/12892237349.pdfIn PDF document text
    • http://studiosaletta.it/userfiles/files/76940705182.pdfIn PDF document text
    • http://selfmadefilms.nl/userfiles/files/mabakuxafixobis.pdfIn PDF document text
    • http://deepakbatteries.com/uploads/file/kijovago.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/15125453162.pdfIn PDF document text
    • http://nanopena.cz/upload/file/zoferanazu.pdfIn PDF document text
    • http://myesen.life/userfiles/file/vidagajuxoxopobunema.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160701f08733fa---ganejulakaxon.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/99390283085.pdfIn PDF document text
    • http://alianzablue.com/aym_image/files/31822072401.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16072867b508fa---topixojiduwuxoxenepamiku.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160867b9eaedc7---63930318080.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/e239acca78e3d2cd9f6249387a8551c9/vuzexeraburinoxuvisuputa.pdfIn PDF document text
    • http://huron81reunion.com/clients/f/fe/feec28e48c841af8be4ad6373737a022/File/99557238193.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/1611488f5172a8---fosowavujikaxupegadutalo.pdfIn PDF document text
    • https://printjet.pl/pliki_user/File/jenelebem.pdfIn PDF document text
    • http://travelsi.ru/ckfinder/userfiles/files/27056799188.pdfIn PDF document text
    • https://frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/17274022932.pdfIn PDF document text
    • http://www.niziointerior.pl/upload/file/pulexopovojuwowug.pdfIn PDF document text
    • http://podiummoda.ru/userfiles/file/xukor.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb398ee1d8---kitasedelarebobewokokap.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00025e5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25E5F 16244 bytes
SHA-256: b1ef7b52ed35dfd01120c19ee4193d967dc828f2fc549fe1a2d8c3c5029b4647
font_01_sfnt_off0002744c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2744C 10260 bytes
SHA-256: 41c0d8d2b2c6747beb8c48594aea9dc884ef1711b089fa50ef15d13d4b2e15a5
font_02_sfnt_off00028b6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x28B6D 19324 bytes
SHA-256: 142e6149989847963bef2340d4b5e02ba77536a1a48852f85ec4260a68275928
font_03_sfnt_off0002bdd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2BDD2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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