Malicious PDF — malware analysis report

Static analysis result for SHA-256 64ee8cd88267f430…

MALICIOUS

PDF

71.0 KB Created: 2021-09-18 20:21:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f42b70a39b2297978375336e8b814d05 SHA-1: 1bebd0e12c8344ad59761df302a6b40ce832cfe0 SHA-256: 64ee8cd88267f4305f04fc5f9c01ab8e5ba6057d84c6bd28feb2be5f8a49709b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to disposable hosting or compromised WordPress sites, indicative of a link farm used for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are sufficient to infer a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 https://medvor.ru/uplcv?utm_term=indibet+app+download+for+android PDF link annotation
    • https://mfdesign.hu/files/file/kesuresutorogukewe.pdfIn PDF document text
    • http://xn--hazrdner-r4a10d.com/alisveris/yollanan_resimler/file/dutixafazarafemoja.pdfIn PDF document text
    • https://netiko.fr/img/Data/file/76209504478.pdfIn PDF document text
    • https://hotelpancharatna.com/assets/userfiles/files/rajinux.pdfIn PDF document text
    • http://suachuadienlanhhoaphat.com/hinhanh_fckeditor/file/21788369908.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/98139546583.pdfIn PDF document text
    • http://jamxmpharmatech.com/upload/files/81934491261.pdfIn PDF document text
    • http://architettotamborra.eu/userfiles/files/77969801187.pdfIn PDF document text
    • http://gustosandvic.com/ckfinder/userfiles/files/lojutitusi.pdfIn PDF document text
    • http://www.iuoelocal870.com/kaizen/ckfinder/userfiles/files/15145175210.pdfIn PDF document text
    • http://jeanthompson.nl/ckfinder/userfiles/files/surikananeluj.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135db65e8daf---lonizosiwilolulafetibu.pdfIn PDF document text
    • https://luiginoiobbi.com/userfiles/file/88414421380.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143debd126eb---zirutuzaxorox.pdfIn PDF document text
    • http://maternites-catholiques.org/ressource/site-image/files/zidiwosobalewotokavudaz.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/dc537529b427106c272a082008a7e83c/6046520132.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf0487138e---lizomipiximoxitanudap.pdfIn PDF document text
    • http://dekobonner.de/userfiles/file/73666486035.pdfIn PDF document text
    • https://xn--z4qq44i.tw/upload/actfiles/92537066701.pdfIn PDF document text
    • https://hojoairport.com/images/file/12167524970.pdfIn PDF document text
    • http://dichvuhieuchuan.com/upload/files/27468118337.pdfIn PDF document text
    • http://chip-chup.hu/upload/file/lesonigigeg.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_off0000b4f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4F4 10500 bytes
SHA-256: e139e2f1deaf479f65c38d137588a024551f960578021344bc507b3c429f9877
font_01_sfnt_off0000ccb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCB5 16472 bytes
SHA-256: 32c35b19d940a17687b7bf5bd4a1c2804e573724c2810f12868de1715e3a49e9
font_02_sfnt_off0000f6bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1