Malicious PDF — malware analysis report

Static analysis result for SHA-256 d76bbee7a3849178…

MALICIOUS

PDF

72.4 KB Created: 2021-09-26 00:02:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b07b78d89a8b9a14472d0992e8c983e9 SHA-1: 4ca2f475909ccc57585f68f46ccc0a7001ccf9ef SHA-256: d76bbee7a3849178a85559636cff5bb1d2f07b49c7099dd91c21c1c2deadd6d1
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with several heuristics indicating it functions as a link farm on potentially compromised or disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the presence of multiple external URLs points to an attack pattern involving redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 https://habibitoursegypt.com/ckfinder/userfiles/files/1072414458.pdf In PDF document text
    • http://yachtales.net/admin/userfiles/files/zebavozak.pdfIn PDF document text
    • https://intersat.lv/files/file/77974517676.pdfIn PDF document text
    • https://philly.drinkpoint.com/uploads/files/26527382799.pdfIn PDF document text
    • https://motty-etai-sharon.com/files/files/disiponiwen.pdfIn PDF document text
    • https://24emk.ru/ckfinder/userfiles/files/27267481876.pdfIn PDF document text
    • https://sanruouvang.net/images/uploaded/file/ruxuwetekakidofemulen.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e39a31d7a8---ralewo.pdfIn PDF document text
    • http://fusheng-vietnam.vn/admin/webroot/upload/image/files/sevana.pdfIn PDF document text
    • https://franchiseharbor.com/files/files/vopupubugatetatosog.pdfIn PDF document text
    • http://lollanaclinic.com/image/upload/File/43309992817.pdfIn PDF document text
    • http://mos-craciun-inchiriere.ro/fckfiles/file/68777703354.pdfIn PDF document text
    • https://ice-group.pl/userfiles/file/26496198616.pdfIn PDF document text
    • https://media-get.ru/userfiles/files/nokobewojavijexevi.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/1187087382.pdfIn PDF document text
    • https://digbijoynath.in/uploads/userfiles/files/pizulabarugage.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/77409308667.pdfIn PDF document text
    • http://sfinance.mn/userfiles/files/49955022902.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/7bfe53b64e87fcb6c304f125c1123bc9/74425589851.pdfIn PDF document text
    • http://geoscan.it/userfiles/files/xopifefuworiw.pdfIn PDF document text
    • http://a899.net/userfiles/file/27739870483.pdfIn PDF document text
    • http://karthikeyanjayaram.com/userfiles/file/52875034216.pdfIn PDF document text
    • https://www.truckersplantparts.co.uk/ckfinder/userfiles/files/70093965101.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/a9958cdf8948125bad5fcb74c2509303/leniwajulepipibulaxedebaz.pdfIn PDF document text
    • http://dajuicebarus.com/uploads/files/46930529229.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=alarm+clock+app+androidPDF 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_off0000b76a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB76A 17600 bytes
SHA-256: 8a669692b21dac2926c42f07d1ec83dd14e7a2b295bd0fa5daf393ccb6dd0172
font_01_sfnt_off0000e494.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE494 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fcab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCAB 10352 bytes
SHA-256: d22e0e426aa1382e5247bff948946519321e58195338c26c236d75f689b7e4fa