Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc78f8b95c253e3c…

MALICIOUS

PDF

71.2 KB Created: 2021-09-01 20:58:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5f466c6c20ba737d14a98aafe70fe2b6 SHA-1: a94fdafb725a4743cf8e0e743477c61f1709614e SHA-256: cc78f8b95c253e3cad3e6d3882c197f95bfe95e998a858d9bf64561e8620a5fc
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress uploads and other disposable hosting sites. These links likely serve as lures for phishing or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://nomylo.ru/uplcv?utm_term=real+estate+apartments PDF link annotation
    • https://agape4u.org/userfiles/file/woneguw.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/s2blsria7tg3dp7vncjgh55vpl/96838456252.pdfIn PDF document text
    • http://carrozzeriardue.it/userfiles/files/98460915124.pdfIn PDF document text
    • http://e-restauracion.com/app/webroot/files/uploads/files/xunobexanekiparon.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/40076317870919f8a6ce7a8d349caf14/kobapupomevixeturufuvo.pdfIn PDF document text
    • https://nutritie-metabolism-sanatate.ro/app/webroot/files/userfiles/files/muvekevexewode.pdfIn PDF document text
    • http://bloomx.com/sites/all/sites/bloomx.com/files/deserabavanedetojirevaf.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e63e3a84094---61964015595.pdfIn PDF document text
    • http://struttur-arch.it/userfiles/files/suwotezasutevufe.pdfIn PDF document text
    • https://yifff.se/userfiles/file/94348352001.pdfIn PDF document text
    • http://xn--h1aaebajlcgx.xn--p1ai/sadm_files/65049327962.pdfIn PDF document text
    • https://huuphongplastic.vn/uploads/images/files/49476210293.pdfIn PDF document text
    • http://netflor.pl/upload/File/43471547015.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/50f3e51ef5406f74a43c7d067e8d6a7b/39031232933.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/j4ndtqu95nmt2b9bdkup0mgldd/derapajaxeg.pdfIn PDF document text
    • http://gewald.ru/content/Files/7018284129.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4b7b87906---lobapenexas.pdfIn PDF document text
    • http://maekalocal.com/Maeka/UserFiles/File/jifam.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/6e48601e7775e018755448249e73ae80/dumiwuba.pdfIn PDF document text
    • http://vakoplus.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/kivapotes.pdfIn PDF document text
    • https://eagle-aviation.com/userfiles/files/fogat.pdfIn PDF document text
    • http://wijnhuis-vaessen.nl/site/data/ws/files/44782981371.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/161218303c100a---83733389532.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///pasarafusavotuxovakugamef.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_off0000baf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAF0 10248 bytes
SHA-256: 693bae8e0bea235d4a32f2f3086e514419871272bfc83bccd5a3094238091043
font_01_sfnt_off0000d1f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1F4 14676 bytes
SHA-256: f3c1bde0350983828328c1d4768de795c45b4ef05760da9ada5270042c6f0042
font_02_sfnt_off0000f5fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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