Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d6fdff2af93ea7f…

MALICIOUS

PDF

71.3 KB Created: 2021-09-02 12:20:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c831c07ba2291ee18ec4afedb45cc026 SHA-1: 213ba6aa0264b4a6db2be4818f7abb09db8224e2 SHA-256: 8d6fdff2af93ea7f0c7641ccb541512a53f6ef564ddef5c40c506f9ab2abc031
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the overall structure indicate a phishing or malware distribution attempt, likely using a lure related to file conversion services.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://garglob.ru/uplcv?utm_term=converter+pdf+em+excel+online+gratuito+em+portugues PDF link annotation
    • https://phuketwebstudio.com/ckfinder/userfiles/files/kikexagevenubezabixu.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/49020397881.pdfIn PDF document text
    • https://sandzak.best/wp-content/plugins/super-forms/uploads/php/files/7bd3703470b329ec290f538b03bec7b8/39370911086.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d6115bb3a45---26995846841.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/34943561654.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/138b1ed15759a90750414f416e7e48de/xosoxadadegavegijuletiw.pdfIn PDF document text
    • https://aterhesseg.com/up_image/file/45308551498.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160bbe1d972d05---zuxerodotasesidezebuno.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/ebb34edada27af73c8fed1f6e03b8b36/gavib.pdfIn PDF document text
    • https://aiwatopup.com/ckfinder/userfiles/files/9295222365.pdfIn PDF document text
    • http://www.bandungmesin.com/file/72888446480.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/wiruxegivararivaze.pdfIn PDF document text
    • http://evolutionchonburi.com/userfiles/files/44039530566.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/kumuw.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc789b09a8---9571092771.pdfIn PDF document text
    • http://vuoncotichdep.com/upload/files/giwuvugoredexegum.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/kefope.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/12747992417.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/a162f42fff58388588dc2e3c6be53b65/jakokidotem.pdfIn PDF document text
    • http://poultech.net/d/files/jilegurupekoto.pdfIn PDF document text
    • https://ka-base.no/images_students/files/laluvefasix.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc535ab97d---melubuwa.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_off0000b464.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB464 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC76 15984 bytes
SHA-256: 7171288712fa0b1ee1c2543f086957a142aba640a9141820a40eb1a0de526062
font_02_sfnt_off0000f536.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF536 11260 bytes
SHA-256: 7f035af780820f10011a08d349918e145531de61e4cfbbf4ec4128e0d31658b8

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