Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4264e64e5ff198f…

MALICIOUS

PDF

81.0 KB Created: 2021-07-28 00:09:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 3bda4a9cb819fd1f81bde42ab1c1bf57 SHA-1: 0a783153295b81c26e67b726d57f5a6f0cb17801 SHA-256: a4264e64e5ff198f6ee5c9143b7faaa7c5bf722487cd42345572263474ab87de
176 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a ClamAV signature and an ML classifier. It functions as a link farm, containing numerous external URLs, many of which point to compromised WordPress upload directories. The document's structure and the presence of multiple external links suggest an attempt to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://entone.es/wp-content/plugins/super-forms/uploads/php/files/7265dfcc445f59258cd85fe23212a150/7916363948.pdf In PDF document text
    • http://euro-ex.com/images/blog//file/51606801202.pdfIn PDF document text
    • http://u15.ch/ckfinder/userfiles/files/16873712295.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/a7de6957e3cc3cdd31cf203d3e85396c/61917392023.pdfIn PDF document text
    • http://balbok.net/admin/ckfinder/userfiles/files/delubezibitutinozagumofo.pdfIn PDF document text
    • http://jrjohnsonfamilyreunion.com/clients/0/09/090f04f22b165063c0e57546eb93b169/File/xekikulitaderad.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/ccfd4f55f486b459fccad741eaf70d34/wekerawiwuxowiwoduwefet.pdfIn PDF document text
    • https://dolmalatrek.com/userfiles/file/nukokokorijebomaz.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092e8e018fea---67591986395.pdfIn PDF document text
    • https://bahamianbrewery.com/ckfinder/userfiles/files/78964374837.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/f188678978c9eb0c99d49316533e751e/zazewonesiradigetukovuruj.pdfIn PDF document text
    • http://www.chubsorn.com/file/files/kamazafisepuzifeja.pdfIn PDF document text
    • http://global-insurance-broker.de/downloads/39742018146.pdfIn PDF document text
    • https://dlt-nkp.com/fileupload//file/36874044809.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/45426a12db1373b1b4f95b1e21808342/xufutubulowez.pdfIn PDF document text
    • https://k-barrierfree.com/FileData/ckfinder/files/20210709_0D81AF1B7930EC1D.pdfIn PDF document text
    • http://baliretreatcenter.com/olabali_ci/media/images/newsfiles/48687058119.pdfIn PDF document text
    • http://wasserburg.pl/userfiles/file/33166926417.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e904fdcb2a---vufirunasetusulawaput.pdfIn PDF document text
    • https://vsetinrally.cz/userfiles/file/musifupopuzipomesux.pdfIn PDF document text
    • https://tecnicadovolante.com/images/file/27228959377.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=wwe+mayhem+qr+codes+listPDF 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_off0000d64f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD64F 17764 bytes
SHA-256: 384c1f10b2a1e67b2a3027c08d1500422c4b5a152c78e3a22f7e8d22e40abb1a
font_01_sfnt_off00010427.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10427 10872 bytes
SHA-256: e79e6800469067b1ce50f5719683abb26895795d50b820e365a4f465312fd236
font_02_sfnt_off00011d1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D1F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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