Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fc09d90ca7baf41…

MALICIOUS

PDF

84.5 KB Created: 2021-07-18 04:42:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c0b41e460c8b5fab03fbce306c51faf7 SHA-1: a4c66428d043866e9b84b8a298f35a23d9e46807 SHA-256: 8fc09d90ca7baf41b0dfab9668277a05692f243a74d395dd6d20e5b8a193ac7f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised CMS upload storage and disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. The document body is heavily obfuscated and unreadable, providing no direct clues to its specific intent beyond the link farm structure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://reutlinger.pl/userfiles/file/jonuzorutomulo.pdf In PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/vchcemjsuos389q1e18vedsrr0/73638374736.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc59216af8a---xowukixin.pdfIn PDF document text
    • https://chuyennhakienvangvn.net/upload/files/79274359771.pdfIn PDF document text
    • http://alliusie.com/userfiles/file/94606122880.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160e92e7e31bc0---kulenumupunolitep.pdfIn PDF document text
    • http://trustarshida.co/cache/fck_files/file/14688183139.pdfIn PDF document text
    • https://honghow.com/ckfinder/userfiles/files/831675110.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084fb7e45ac9---zupavefekokutilupurof.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160783f27259a7---65641758112.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160775684b5c8f---ragiz.pdfIn PDF document text
    • http://hotelbellevuepalermo.com/userfiles/files/dinumowovapowavagakafufon.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/449119e90348f9d24ea6b474943cc660/88453062113.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d313d72ee2---41633829857.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1609d571c1d998---48226004104.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160b4cbc297f40---46639817678.pdfIn PDF document text
    • https://transpack-krumbach.de/_upload_bilder/_filemanager/file/pefoguxuzu.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/ebb2d1a32d530a607c494c69c6534d38/medegudegigevik.pdfIn PDF document text
    • https://deniz-sogutma.org/img/userfiles/file/7503057395.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/8gftshirgo3i66tbatf8ohsllg/51603063995.pdfIn PDF document text
    • https://fentesmakina.com/paket/upload/files/38333524205.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/piwaribo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=legacies+meaning+in+englishPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bff8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFF8 2456 bytes
SHA-256: 8bff531f90b9cf3bd5b85bd040f1dbd8e5b9ab4e201150b3c4dda9f2c88fc480
font_01_sfnt_off0000ca3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA3D 19244 bytes
SHA-256: df788e3857c902265189e104e7015d663cb72a8fe16c29893e75e9dbfe61ce30
font_02_sfnt_off0000fac1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC1 10316 bytes
SHA-256: ea6ffa546a8ce50e35780ce17fa10f61a1b75a0ffcb6a63b68fed1187d7ad9c6
font_03_sfnt_off000111b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111B4 16916 bytes
SHA-256: 1472fbe7b0ec09643f6d6dab38c3c9942505cf2a2939a03ad20c3f67ab5bda14
font_04_sfnt_off00012a4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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