Malicious PDF — malware analysis report

Static analysis result for SHA-256 e456bd92a8fdc02c…

MALICIOUS

PDF

82.7 KB Created: 2021-10-07 10:19:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 7929a37047e324ff936471e7ad2bc9ba SHA-1: daedaca80d1274b69c8fa2f78f584b6721ce90fa SHA-256: e456bd92a8fdc02c91406e1aa615257e6d73965f9f37a27021fa5b153b14acf6
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, with numerous embedded URLs pointing to potentially compromised or disposable domains. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a non-clustered link farm on disposable hosting, and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM points to links hosted on compromised WordPress upload storage, suggesting a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://huntic.ru/uplcv?utm_term=hardware+and+networking+pdf+books+free+download PDF link annotation
    • http://preprod-proximeo.com/ckfinder/userfiles/files/67719522132.pdfIn PDF document text
    • http://numismatika-nbkpdy.cz/userfiles/file/83263303470.pdfIn PDF document text
    • http://nomorecpapmachine.com/userfiles/files/jevelonozajakifarinavubi.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16151d06a9f47d---56923659684.pdfIn PDF document text
    • http://expresskaliski.info/file/bedufim.pdfIn PDF document text
    • https://ewastexperts.com/userfiles/files/56198599129.pdfIn PDF document text
    • http://e-motyle.natura2000.pl/imgturysta/files/zotitefomizuxa.pdfIn PDF document text
    • http://uts.edu.co/portal/app/ckfinder/userfiles/files/xejadasimevoni.pdfIn PDF document text
    • http://ozt.zielonetarasy-cieplice.pl/uploads/userfiles/files/13719240460.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/btjthu98mvpt6i5isfr1o01lpo/fepikot.pdfIn PDF document text
    • http://vestmorecapital.com/images/epost/45759943030.pdfIn PDF document text
    • https://feng-shuiworld.com/userfiles/file/74181664928.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16140669fda032---45968691891.pdfIn PDF document text
    • https://cottingham-group.com/cufiles/files/3190913587.pdfIn PDF document text
    • http://elsped.hu/files/file/jolemizinavol.pdfIn PDF document text
    • http://italianopizzeria-pg.com/uploads/files/gibesi.pdfIn PDF document text
    • https://tideandtigers.com/ckfinder/userfiles/files/padujurutebaniderelama.pdfIn PDF document text
    • http://kronikarp.pl/ckfinder/userfiles/files/43998266615.pdfIn PDF document text
    • http://faptvmedia.com/userfiles/file/larikijapekanomilimazuvik.pdfIn PDF document text
    • http://milwaukee.center/userfiles/file/gowodox.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/32b48a92d30b43d13d555c847da215e2/28519866836.pdfIn PDF document text
    • http://yh-nutri.com/filespath/files/20210911154700.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/3cf3f53328fd6e4834349f2ea7d1424c/72643209220.pdfIn PDF document text
    • http://studiorinaldibedin.eu/userfiles/files/84678790074.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///20210923101346_487292857.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/61724349989.pdfIn PDF document text
    • http://kompletucetnictvi.cz/files/file/66438452110.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_off0000da9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA9E 18656 bytes
SHA-256: 78c1e002cdb89ac8f6cf7d96f16b46206b9f53d95128f591ad387cb436bae21c
font_01_sfnt_off00010b6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B6C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012383.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12383 10980 bytes
SHA-256: 19439b0bdfa49e8ff373d26cd2f51510b1c1ae6f7f799b484c5704f2d3dc699d

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