Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e9cf10563e3be6b…

MALICIOUS

PDF

70.3 KB Created: 2021-09-16 21:58:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c26f900a1523ad07563000948941fc5b SHA-1: c33a987b9375b7c49d9c737af36e9334c5bcea00 SHA-256: 5e9cf10563e3be6b5dda5b4c3935f230e60292dad2ac64ab952c1457e2d17916
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many embedded URLs pointing to potentially compromised or disposable hosting sites. The primary purpose appears to be directing users to external, untrusted resources, which is a common tactic for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://studio5r.com/userfiles/files/buvoduf.pdf In PDF document text
    • http://avon-bratislava.sk/files/files/nidab.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613e760442997---bofadirakivudaduseget.pdfIn PDF document text
    • http://studiomistretta.com/userfiles/files/53546680868.pdfIn PDF document text
    • https://etcbt.com/userfiles/file/82665913030.pdfIn PDF document text
    • http://softtox.pl/new/userfiles/file/34188847838.pdfIn PDF document text
    • https://unique-u.biz/images/uploads/file/66970977364.pdfIn PDF document text
    • https://pernambucoimortal.com/imagens/files/82016764886.pdfIn PDF document text
    • http://hauptlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/70456848180.pdfIn PDF document text
    • https://prospr.fr/ckfinder/userfiles/files/13720122814.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132f1241855b---4838271441.pdfIn PDF document text
    • https://hurghadalife.net/userfiles/files/noguwuwokobaketupi.pdfIn PDF document text
    • http://etkindenetim.com/resimler/files/3015993574.pdfIn PDF document text
    • http://ageddfjtjgrade.pretty-match.com/upload/files/vovidujexuzekutajej.pdfIn PDF document text
    • http://2478.ru/admin/ckfinder/userfiles/files/vasuletamobopopuzotig.pdfIn PDF document text
    • https://beldapin.com/calisma2/files/uploads/20088166798.pdfIn PDF document text
    • https://2ruoteexpo.it/ckfinder/userfiles/files/23145809607.pdfIn PDF document text
    • http://vimar.ua/userfiles/files/3254183046.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613fccae1555e---winebujogepowukazubu.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/161417219e55ac---pafitojojexis.pdfIn PDF document text
    • http://sdds.be/userfiles/file/31440915067.pdfIn PDF document text
    • https://seikai.jp/free_images/files/fexojanewadexowotizaz.pdfIn PDF document text
    • http://rosniyom.com/userfiles/files/70996781755.pdfIn PDF document text
    • http://dhf-china.com/d/files/73638988639.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/25750346252.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=sniper+3d+hack+mod+apk+unlimited+money+and+gems+and+energy+downloadPDF 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_off0000b05b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB05B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c872.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC872 11600 bytes
SHA-256: d3bb6391da915e7e470881d2c15e172b98e8b2e043fdd472cbd4b676bf403db9
font_02_sfnt_off0000e3ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3AD 14776 bytes
SHA-256: 376c1d9900981271b4ce34806824759b23019086d06ae4c6986545882cea7064