Malicious PDF — malware analysis report

Static analysis result for SHA-256 9767847d2a96c4ca…

MALICIOUS

PDF

74.9 KB Created: 2021-09-05 20:33:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 369ffdd278a30c79305ade61e0a501f2 SHA-1: 16b4595947182825cf80a754c70bb519ab29e1d9 SHA-256: 9767847d2a96c4ca3c848d71d5f81e952526adfed2be8b264dd24f06ae1427ec
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan-like behavior. It contains a link farm with numerous URLs, many hosted on compromised CMS uploads or disposable hosting, suggesting an attempt to distribute malicious content or manipulate search engine results. The presence of embedded URLs and the nature of the link farm point towards a phishing or malicious redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://venkateshservices.com/uploads/papiguvepumoz.pdf In PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160930c3d99621---tibakoxekul.pdfIn PDF document text
    • https://mujeresenmovimientoplus.com/userfiles/file/49133900431.pdfIn PDF document text
    • http://radio-salsa.com/php/rs/filesupload/file/siwuxejowu.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160be7196a9595---78333801464.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d172846ea5---befefukil.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9bac08c59e---53572455706.pdfIn PDF document text
    • https://network-italia.it/file/67620665569.pdfIn PDF document text
    • https://rrr71.ru/upload_picture/ramuweref.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609d4efa2ac32---rigebesajokomawozotaj.pdfIn PDF document text
    • http://master-vin.ru/files/file/91894537362.pdfIn PDF document text
    • http://smn1970.com/clients/d/d4/d44d2684521ac238e4bdef02d06179b0/File/50688507089.pdfIn PDF document text
    • http://fabriziocar.it/userfiles/files/41524617001.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/ghne19a3ninjqi85nneut6srkc/10959466580.pdfIn PDF document text
    • http://chanakyaaerospacedefence.com/userfiles/file/wixezonavewokajuninomako.pdfIn PDF document text
    • http://lynxitservices.com/ckfinder/userfiles/files/piribowekutibegurejapig.pdfIn PDF document text
    • https://emprenderem.cl/files/nerefazepekubevuzu.pdfIn PDF document text
    • http://aroma-es.site/yamituki-n/uploads/files/42061422079.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/cb5efdec8d8dd17a3e5108a7d7627ca9/torodizobe.pdfIn PDF document text
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5165e6cd0---laginokevupadaxosem.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/tfcctohfhk4e567h6ti3kv4nj2/vegovemikotogo.pdfIn PDF document text
    • http://cuadepthanglong.com/images/ckeditor/files/duxekenefedo.pdfIn PDF document text
    • http://mav-auto.ru/images/file/16016364915.pdfIn PDF document text
    • http://dennehylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bigobisubexodojopo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=360+degree+performance+appraisal+pdf+filePDF 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_off0000c1f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA0C 11228 bytes
SHA-256: 0e3f26875ea65517c92acae490bd366ce3f25d71adec911bca7b976655cb4f40
font_02_sfnt_off0000f40c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF40C 16196 bytes
SHA-256: 55b44ba0247a1eb49c97fd6e8c416f2e8e016699810c44f35da3f40d485fe554