Malicious PDF — malware analysis report

Static analysis result for SHA-256 08cbc66020a15a47…

MALICIOUS

PDF

90.3 KB Created: 2021-09-03 18:46:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f3b92f34893e95ea136a121bb57d9ada SHA-1: 2f4ae538e99b8941715c993fbd263af8a904733c SHA-256: 08cbc66020a15a4748294f7edfe3009d9e958e9f593e62261239ab3d5f6bd879
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, containing numerous embedded URLs pointing to various domains, some of which appear to be compromised or disposable hosting. The primary purpose seems to be directing users to external content, potentially for phishing or SEO manipulation, rather than executing a direct exploit within the PDF itself.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://xn--aknmedical-yub.com/uploads/file/94968354143.pdf In PDF document text
    • https://ratsimae.eemedia/contents/file/37269333158.pdfIn PDF document text
    • https://sportsslife.net/upload/ckfinder/files/65522868068.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afcc2fef56c---33333179135.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/15e34a4f3b09b3608702be71e75cb02a/somak.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a99ee3253---wabaneridesibexosedaz.pdfIn PDF document text
    • http://kaymccarthy.com/immagini/file/wokikoribiladogiparo.pdfIn PDF document text
    • http://sententtech.com/file_media/file_image/file/99520173399.pdfIn PDF document text
    • http://horlickhigh61.com/clients/a/ab/ab3fb267cc30d45b98f460a20cee0b8d/File/44207245380.pdfIn PDF document text
    • http://redemaisfarma.com/userfiles/file/jefamepetenevugisiwen.pdfIn PDF document text
    • http://yjccnc.com/upload/files/98106340222.pdfIn PDF document text
    • https://akproauto.net/nbloom/fckuploads/file/lozukasowopojonaxezopoxa.pdfIn PDF document text
    • http://parisplaza.net/clients/3/35/3561a7ce45da2f2f114a98ea6175a4b1/File/dasuzon.pdfIn PDF document text
    • http://cattaneoarchitetti.it/userfiles/files/naligufijinapimo.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609e0c08d99b8---bakikudoxavarezaku.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae74932e1f---giribazutebalovilemilowe.pdfIn PDF document text
    • https://latework.cz/soubory/24445755116.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3fe6cc2ce6---tazitulorilozewisajus.pdfIn PDF document text
    • https://www.geo-decouverte.com/ck/ckfinder/userfiles/files/pometuwaputizajepip.pdfIn PDF document text
    • http://www.museopizarra.com/ckfinder/userfiles/files/2304708788.pdfIn PDF document text
    • https://gifarlcm.com/upfiles/editor/files/kukutanumad.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/e1414fe5avac9mi88nveusnsio/faduja.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/litorubevizog.pdfIn PDF document text
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/51312490573.pdfIn PDF document text
    • https://xn--b8qxb801j.tw/upload/files/todome.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1610d74da43975---gefosijumekefamiw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=diagnostico+educativo+definicion+pdfPDF 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_off0000f990.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF990 10816 bytes
SHA-256: 288c4b5cb4ab99a94078f50f98039ba64cfe44b1568d2d70362f475b82aa28cf
font_01_sfnt_off0001127f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1127F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A91 19460 bytes
SHA-256: 981e64f68fa8de89eb737f0c0d205aae960741e4bb96331469e4f240d7d82345