Malicious PDF — malware analysis report

Static analysis result for SHA-256 eda0df7349743db8…

MALICIOUS

PDF

73.5 KB Created: 2021-09-07 22:44:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f7fc4c39f0fd6e6122c45abb0f7e7548 SHA-1: c2ee234eb31d4c072a55e64a5bca1c95d40d3ea5 SHA-256: eda0df7349743db88d11752d4a129526dbf3580fa7cd9a9e4ca436bfb994f8ed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress upload directories and disposable hosting, characteristic of a link farm used to distribute malicious content or phish users. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe906ac133---60695297314.pdf In PDF document text
    • http://burfel.ru/upfiles/files/puwela.pdfIn PDF document text
    • http://lmleadmanagement.com/userfiles/files/fakuz.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba5a6bb7dd8---tojopenalexali.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/781179ea004807d408efcfe3301cb497/junumuv.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/3d7b553f861b18d1beb8a9281037b511/18126699279.pdfIn PDF document text
    • http://aibasylhet.edu.bd/app/webroot/ckfinder/userfiles/files/paribirakavup.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/65797719010.pdfIn PDF document text
    • http://worldnaturalfood.com/image/upload/File/xosoxemibalaweduva.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16078abad162d0---11479410363.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b02859c083---gobuxave.pdfIn PDF document text
    • http://baiduvpn.com/upload/files/29425831636.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/3954c448430d60c6859173a891fb945b/kepugagirizijapomuxefugor.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c873f100d72---21809048221.pdfIn PDF document text
    • http://andrenickels.de/ckfinder/userfiles/files/79848948138.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/ziletobigofigonem.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d363914054---49556206775.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/r97t90p89npepa5maa4f12asc4/naxizakumu.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ac26bb21f0523d972e9ce9d809492717/lufirux.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/37613279562.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/vupitige.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bfbbce3a544---83178374034.pdfIn PDF document text
    • http://madiran-cruduparadis.fr/ckfinder/userfiles/files/10388101093.pdfIn PDF document text
    • http://fipjp.com/userfiles/file/46269635823.pdfIn PDF document text
    • http://onlineticketreview.com/images/file/kipudop.pdfIn PDF document text
    • http://cosmic-kino.ru/sadm_files/64815155107.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=plotting+irrational+numbers+on+a+number+line+pdfPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bc99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC99 11080 bytes
SHA-256: a75f8e291564c4bea879db18b52c9f130b370d0e3616c07ef6ff80cfecc2d477
font_01_sfnt_off0000d601.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD601 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ee13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE13 16328 bytes
SHA-256: f6945aa6ddcec4143bda1bb2b4bfcb600183b79bb25f0c5b446ac1aae9384d3b