Malicious PDF — malware analysis report

Static analysis result for SHA-256 f08e12acc6fc1682…

MALICIOUS

PDF

89.6 KB Created: 2021-09-02 23:51:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c392fecf770439fab2f2cf14af328807 SHA-1: b7d016c53705423704d1884ea45486dc625b2e91 SHA-256: f08e12acc6fc1682f943a8e3561f24f08f928582a1fabce0a4c7891aefda9887
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, distributing links to various domains, many of which appear to be compromised WordPress sites. The presence of numerous external URIs and the link farm structure suggest an attempt to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://xn--9d0b102a6wc3y4a.com/sa_upload/userfiles/file/20210520054205.pdf In PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/79b681e2297a9ffad32d31b004e779ed/12627877927.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ed3fbe394---21963212690.pdfIn PDF document text
    • http://osc-pribor.ru/products_pictures/file/21984901363.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/087d69ef5d0b6160b9257925298f5162/52928401588.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/48406602126.pdfIn PDF document text
    • https://wkd-uk.com/wp-content/plugins/super-forms/uploads/php/files/15b04bf25322d4757b489dcc8cc8e026/pifewegitux.pdfIn PDF document text
    • http://irvinenott.co.uk/ckfinder/userfiles/files/gazekonizimi.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/f20824c0db01cb5513a7028d821fe1b5/xafazadufugebixakibi.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c453c779711---95050502894.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/pt3m187ns01evicb6h3vd3kbq5/midobesodopi.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16105b4802c53d---15468015719.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/16096f23064ef9---matusimapudovibobiwijag.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085b4ffa5892---weromawubizosugifonapijo.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160795a909ca31---nuxugejononarerur.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081e04049e84---17864734397.pdfIn PDF document text
    • http://donleroy.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tadiwotaxonezafovixupul.pdfIn PDF document text
    • http://dichvugiayphep.biz/upload/ck/files/44180249380.pdfIn PDF document text
    • http://domplus.su/userfiles/files/12314721358.pdfIn PDF document text
    • http://gd-weimi.com/upfolder/e/files/20210815105538.pdfIn PDF document text
    • http://ourhkg.com/UPFILE/userfiles/files/lafopu.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/d267fdab95872dd66e899763c49f8acd/legaban.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=greasy+lake+short+story+pdfPDF 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_off0000f9ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9AB 10644 bytes
SHA-256: dbc5cc9f6d4b491988300ec8ceb540b6c6dbf17fca66bafbfcc4e09d71a2f6a8
font_01_sfnt_off00011241.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11241 18500 bytes
SHA-256: 700eb51268fcdddd605599d91f16bc11b23e92fb73e8ea22b13e0b367c1bd2b1
font_02_sfnt_off0001414d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1414D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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