Malicious PDF — malware analysis report

Static analysis result for SHA-256 841cc7fdb4f54611…

MALICIOUS

PDF

102.2 KB Created: 2021-06-13 08:33:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 01c4dfae24c932232c63e3c80c18fce2 SHA-1: 6b155c9617b827d4955842b5a866db83fe935b90 SHA-256: 841cc7fdb4f5461119e619cfec5f0ee6ed924d964b05086f1de52220d7c7975d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://chcial.ru/uplcv?utm_term=bdo+failstack+guide PDF link annotation
    • https://schmitz.cz/res/file/55927160281.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16084c9c9e8bdf---29173989380.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/4ffa550b0ab6c1522d0f02d64048b2b7/60678629130.pdfIn PDF document text
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/7af6a87387c5bf59cc0b0441e36e4f91/13459742126.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb2bd5a474---29486254974.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/66106c790757e9334cdd2bc00c26e3b0/10437963333.pdfIn PDF document text
    • https://mednet.mk/public_html/upload/userfiles/file/risesefumisuxefowujolune.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/mimelobol.pdfIn PDF document text
    • http://ash-graphy.com/userfiles/file/31441175975.pdfIn PDF document text
    • https://matrainagycsalados.hu/userfiles/file/duxitelerixurozinam.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/6cd4fc539704eb2a965b38092cb921d8/18343395232.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f548da4727---xomukoduxani.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/7jb4uijs2883jm5q7vo0j1v54g/1965108896.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c22e5f9bfb8---36607060854.pdfIn PDF document text
    • http://geologicatoscana.eu/userfiles/files/busenotiruleporelubu.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e33ba58736---tinomukutezapufegojax.pdfIn PDF document text
    • http://garderoba.sk/images/_file/28185230932.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608fb05ed92a8---gumod.pdfIn PDF document text
    • http://slhs1958.com/clients/18590/File/92560766459.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012df4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DF4 5208 bytes
SHA-256: f7a41bb4d5c573559c3fdd39504e92437b6c58dee95423e0b77dabc6870a4aab
font_01_sfnt_off00013fbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FBF 2604 bytes
SHA-256: 7990065610e0521048c31369f2e79f60e053f6f2b45c763113a0156cc162b730
font_02_sfnt_off00014a15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A15 11388 bytes
SHA-256: b92e61a5e2fa40f0e44a084ff1829a049a05b562f0541b0cc373d45a42d10a43
font_03_sfnt_off0001713f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1713F 17400 bytes
SHA-256: b317332db37ad9371d5465691df34b0c13da71cc1380c07a6099d43112510fc5

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