Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3f2d38536631436…

MALICIOUS

PDF

91.7 KB Created: 2021-09-18 14:03:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 9f14ccb0ee8257b59d61afe8fe4c4db4 SHA-1: e30409f89dafa1c06ce7a5e49ea50e0e82e506f0 SHA-256: b3f2d385366314369a94afcec0063df1e0124840957d695fead104aee9cc3fde
196 Risk Score

Malware Insights

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

The PDF contains multiple links pointing to external resources, many of which are hosted on compromised WordPress sites or disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to trick the user into downloading a secondary payload. The heuristic firings related to link farms and compromised CMS uploads further support this conclusion.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://hopadive.cz/ckfinder/userfiles/files/84213932063.pdf In PDF document text
    • http://zussobrance.sk/grafika/dokumenty/4684653713.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16135d1daa508d---podakulazomazi.pdfIn PDF document text
    • http://pi-consulting.ch/download/28350422268.pdfIn PDF document text
    • https://castilloexterior.es/ckfinder/userfiles/files/16978987093.pdfIn PDF document text
    • http://ntouioc.ntou.edu.tw/ckfinder/userfiles/files/31539200957.pdfIn PDF document text
    • http://tischlerei-schlusche.de/sites/default/files/file/batogiwoj.pdfIn PDF document text
    • https://edusfera.pl/upload/file/bitalazalakerakuka.pdfIn PDF document text
    • https://cargotavio.ru/files/file/jagozilu.pdfIn PDF document text
    • https://ta-taiwan.com/app/webroot/userfiles/files/vugisafosojopepo.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16143c2e745f29---gutorimopaxiniwi.pdfIn PDF document text
    • http://vuatoyen.com/uploads/userfiles/file/botufifiribax.pdfIn PDF document text
    • http://zhouzhuank.com/v15/Upload/file/202199181666118.pdfIn PDF document text
    • http://abwsalisbury.com/uploads/files/gokomiputumugamuxokenos.pdfIn PDF document text
    • http://wronba.com/uploads/wysiwyg/file/5092145486.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/ziranufimeminafuzuji.pdfIn PDF document text
    • https://ruh-center.ru/userfiles/file/zakeniridesitisumov.pdfIn PDF document text
    • https://lesartsdansmonjardin.com/userfiles/file/20210902145254.pdfIn PDF document text
    • http://www.espaciocultivarte.com/ckfinder/userfiles/files/mamibadaxa.pdfIn PDF document text
    • http://veterinarioassociatopacinidallatorre.eu/userfiles/files/28991486988.pdfIn PDF document text
    • https://profix.fr/ckfinder/userfiles/files/papozikinuvodix.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/f2a450de4f5450b2b235b3f81bacf320/mupopezib.pdfIn PDF document text
    • http://ckpak.com/fckeditor/userfiles/file/nobasebopaze.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/t60n7f9ko7fsp49huh12aeskg0/poxerapaxunenovifigam.pdfIn PDF document text
    • http://1yunnan.com/ckfinder/userfiles/files/lazekimijemanaduzisiv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=nba+2k8+download+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_off00010310.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10310 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011b22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B22 17768 bytes
SHA-256: 6b7f935ae703b9fd639897249595c600d46ec43184851c06dfee4ff28fb4d8ec
font_02_sfnt_off000148e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148E6 10464 bytes
SHA-256: 04f4fc43bb5a7c05791d776fc6f5f085dd1617387d47dde9dd736243138e6359

Open this report in the interactive analyzer, or submit your own file for analysis.