Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ca93460c3177c4f…

MALICIOUS

PDF

69.4 KB Created: 2021-09-19 02:08:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: acfa68950cea74ec288e238798a80352 SHA-1: 5c5d13758ab6db4d5c51d1b4d0a591edbb7d2387 SHA-256: 4ca93460c3177c4f6ca77e4fe0177ce3ecdb7fb6e7e25b8d7685942a95829243
196 Risk Score

Malware Insights

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

The PDF document contains multiple links to external resources, many of which are hosted on compromised websites or disposable domains, suggesting a phishing or malware distribution attempt. The heuristic 'SE_REMOTE_SUPPORT_LURE' indicates the document's content likely instructs the user to install remote support tools, a common tactic for social engineering attacks. The presence of embedded URLs and the ML classifier's high confidence score further support the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://pistant.ru/uplcv?utm_term=teamviewer+for+android+download+apk PDF link annotation
    • http://shopgraeagle.com/ckeditor/uploads/files/91620469338.pdfIn PDF document text
    • https://alpinismbihor.ro/app/webroot/files/userfiles/files/xexebozifopew.pdfIn PDF document text
    • http://oreoltour.ru/sites/default/files/file/tadozumavite.pdfIn PDF document text
    • http://maristaslardero.es/userfiles/file/76614294435.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/161408cafc3c93---98350150386.pdfIn PDF document text
    • https://alwillislifecenter.org/ckfinder/userfiles/files/sijokarolamiwebilarewip.pdfIn PDF document text
    • http://paradisetnl.com/FileData/ckfinder/files/20210913_1A005B5FCF2DA4F4.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e558f4d688---56621633817.pdfIn PDF document text
    • http://ediliziaunoaventi.com/userfiles/files/walitebubimotakijavugosa.pdfIn PDF document text
    • http://scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/83257845802.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/161322d60942a6---kumokupofusobovove.pdfIn PDF document text
    • https://calendarsunrooms.com/userfiles/files/85629886215.pdfIn PDF document text
    • http://lokalizacja-gps.pl/userfiles/file/51271372515.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161357ccc6483f---musijapopakofuzelibiger.pdfIn PDF document text
    • http://archgeo-leszno.pl/uploads/userfiles/files/27451936396.pdfIn PDF document text
    • http://cichanski.com/Upload/file/mopovowepixijufarewoseri.pdfIn PDF document text
    • http://metrominicabs.com/survey/userfiles/files/kukago.pdfIn PDF document text
    • https://agriturismoilcolle.org/userfiles/file/82120560949.pdfIn PDF document text
    • https://trungtammatnamviet.vn/upload/files/dolufalunami.pdfIn PDF document text
    • http://all4pets.cz/ckfinder/userfiles/files/latupi.pdfIn PDF document text
    • http://4bx.pl/public/file/90487415633.pdfIn PDF document text
    • https://fallsplat.se/bildbank/file/56611594268.pdfIn PDF document text
    • 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_off0000b158.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB158 10600 bytes
SHA-256: 6094d1e381515e87e238b8c569778d5922d677d4e6025dae8792e80bd7a19511
font_01_sfnt_off0000c980.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC980 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e192.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE192 15168 bytes
SHA-256: 058e5351dcb7eb5fa762fa007c859a5aba1b82fe7e24a9eb25d0e3a49550dd4f

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