Malicious PDF — malware analysis report

Static analysis result for SHA-256 651a7f124778df9c…

MALICIOUS

PDF

92.3 KB Created: 2021-09-02 04:27:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6f0b65af5549ae7b1b2b4bc81117599d SHA-1: 0080ee429e13007f00098c2e283201021d3c70e3 SHA-256: 651a7f124778df9cca9ebe765a8bc439c5e35ce28815b4242cabb6fbaef9941e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. ClamAV and ML classifiers indicate malicious intent, specifically classifying it as a phishing trojan. The presence of link farms on potentially compromised CMS uploads suggests an attempt to obscure the final malicious destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8847

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://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b99d6dd1a42---65849936671.pdf In PDF document text
    • http://maility.pl/_ADRESuserfiles/file/70059277986.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160742b37de302---98562145730.pdfIn PDF document text
    • https://drsubhashawale.com/ckfinder/userfiles/files/85246205105.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/b2306ec159f466e017dfdde21086988f/13511024879.pdfIn PDF document text
    • http://giaodantanthaison.com/Images_upload/files/vamosavati.pdfIn PDF document text
    • http://cck-brno.cz/ckfinder/userfiles/files/xelotamopapikelalofa.pdfIn PDF document text
    • https://anfauglir.com/images/file/54357035996.pdfIn PDF document text
    • https://habibitours.org/ckfinder/userfiles/files/32817777509.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/987ec5bdbaff82375a45e5dba4ab64e9/70297208872.pdfIn PDF document text
    • https://ckmusicdesign.nl/userfiles/file/27250694861.pdfIn PDF document text
    • http://etpatatietpatata.com/userfiles/files/90620869764.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/blbuibdv0i1s7a8553rv58cihh/32520051025.pdfIn PDF document text
    • https://kaowei.tw/image/files/20210701_142722.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071becb3e747---zovizibobutukunefidu.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/d7b9a458760e46926792f367c7f34250/44164886354.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160dbb82575b43---mopojujugiseremoti.pdfIn PDF document text
    • https://jiu-hang.com/upfiles/editor/files/fedobatid.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b8b96e878e---1459584684.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8989f9e328---18308424012.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b20a0ad74f7---82263297563.pdfIn PDF document text
    • http://bezagsecurity.cz/userfiles/xubijevuvewogarataj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=simplifying+rational+fractionsPDF link annotation
    • 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_off00010a0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012223.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12223 10880 bytes
SHA-256: 351ed9bf02356666d0283cd8c038565eb88d80dcb264edcfe7435521b38cba29
font_02_sfnt_off00013b3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B3E 18340 bytes
SHA-256: 371bf1fc1e3c8870220b7bfedec32bbd3ab4d6635997ee7b564aed056a8b4097

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