Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebdebb0879113d77…

MALICIOUS

PDF

80.0 KB Created: 2021-09-05 20:55:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 933bf56490a970422685b7330f8d9b7c SHA-1: f06a6cf7a32192b4edc884f56c0ed858a7c8db03 SHA-256: ebdebb0879113d772bda317fe2746e9ed0f75e0b0256980cb77baa0c905eda39
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://allytemp.ru/uplcv?utm_term=bourree+in+e+minor+guitar+tab+pdf PDF link annotation
    • http://etpatatietpatata.com/userfiles/files/65896818721.pdfIn PDF document text
    • http://dlastudenta.org/Upload/file/57719423555.pdfIn PDF document text
    • http://vce34.ru/attachments/file/37991605384.pdfIn PDF document text
    • http://thermogroup.ru/uploads/files/3261524131.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b59cf07629d---64956084239.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/50066292185.pdfIn PDF document text
    • http://ipublicity.cz/data/file/35312541868.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/2dc5028675b90cd35fdd279f6fed1509/gefosotivogezewa.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/c16f36fc5195b0350090f9ca42816e4f/46508567535.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1611836c2916d2---demizogukozupepatinosos.pdfIn PDF document text
    • http://myslizdrave.com/soubory/kizovarixab.pdfIn PDF document text
    • https://aspirans.com/files/file/zasit.pdfIn PDF document text
    • https://behagi.eus/files/galeria/files/mosazojib.pdfIn PDF document text
    • http://yejida.com/userfiles/file/xogejinegijexoji.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/fff2eb8b2255a9518f7117318398eebf/mokelosepugutelexil.pdfIn PDF document text
    • http://hertzlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zutuzolewefavisedipaxosi.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/f9ab326f5bf0ed3fe8a4e0bbca95ce9f/makim.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/17d4vb38m6ne0u7ngs3uevi83u/40853484836.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/161190bb0172ba---lugevelafoxotagejazel.pdfIn PDF document text
    • http://samuiluxurytravel.com/Uploads/file/papeperivexelokubijene.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/99p45mmqsv330dj6i9jep925s3/38255090989.pdfIn PDF document text
    • http://satakantaresort.com/user_img/files/15235890680.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_off0000d05c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD05C 10920 bytes
SHA-256: 7f3118e9376bc512d975385d6439406924ac148ef502e06a6ef54286162f90ab
font_01_sfnt_off0000e937.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE937 18264 bytes
SHA-256: 56e449daa5da563d9f1050550d0d9eb40ab3d213c8bd3a437d94dee80f971f94
font_02_sfnt_off000118c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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