Malicious PDF — malware analysis report

Static analysis result for SHA-256 82fb22a74597ae84…

MALICIOUS

PDF

72.0 KB Created: 2021-10-01 13:35:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a29d1e1864963b45c1275df9e0c97b82 SHA-1: d3c1680ce047d0a01c1109a2973a2cb6677ba427 SHA-256: 82fb22a74597ae845d5cdacf1c1e7f1df2679d71d5c92b0f06a5997e6b3d223f
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous URLs pointing to various domains, some of which are hosted on compromised CMS platforms. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user consumption but rather as a vehicle for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/29997527188.pdf
    • http://eperon-kochersberg.com/img_db/xeleduraxukojofa.pdf
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/52b03b021713935b32ed49f66d7999f3/82468938347.pdf
    • http://bidadapatidar.com/userfiles/file/33094616479.pdf
    • https://walnutcreekguide.com/wysiwygfiles/file/pejivozan.pdf
    • https://kawanmto.org/contents/files/besumibamigakekukumigarej.pdf
    • http://aquamedia.cn/ckfinder/userfiles/files/jisozerexivesevubaxu.pdf
    • http://www.edgartownschool.net/uploads/files/53674196712.pdf
    • http://vagtteam.dk/userfiles/Files/kuriwijure.pdf
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/244fd9cba64d17f99de22eb8cdc538b0/nimivoleziteluwozo.pdf
    • http://delifarm.com/images/file/gojatabo.pdf
    • http://come2menorca.com/images/file/23824191701.pdf
    • http://exim5.hu/_user/file/98612991736.pdf
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e3e43de714---xibum.pdf
    • http://zit-tech.com/userfiles/files/xafutuvufufu.pdf
    • http://hangnhatbanonline.com/upload/files/japevomasikak.pdf
    • http://files.ibiza-ferien.de/file/44895895152.pdf
    • https://uleiuri.ro/userfiles/file/45214751644.pdf
    • http://solarissoft.com/img/userfiles/files/jamebif.pdf
    • http://poslovniimenik.net/firme_data/files/32651915447.pdf
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16145932e2941f---55106639595.pdf
    • https://sanipro.ma/app/webroot/uploaderfiles/zemubulixewujugop.pdf
    • http://lmnn.ru/userfiles/file/63919263547.pdf
    • https://svltv.in/userfiles/files/modelokegigebisubu.pdf
    • https://2ruoteexpo.it/ckfinder/userfiles/files/25457394077.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=quadratic+equation+by+completing+the+square
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b506.bin
c967f1b6776960279254b3ffac962a0e3dd6e5e0537a26e45ec102e63a32e6d5
pdf-font-stream PDF embedded font (sfnt) at offset 0xB506 16656 bytes
font_01_sfnt_off0000df8f.bin
cc4df6a07c930fc2489f9d779122d94f079f2eddf79498d4af0f67c572a57aa6
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF8F 11520 bytes
font_02_sfnt_off0000fa03.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA03 16792 bytes