Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dc766ff6d5b7cba…

MALICIOUS

PDF

78.1 KB Created: 2021-09-07 08:00:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 85401c5a065c8e526ac5059baf133249 SHA-1: 6ac825e36b2edc6f2597f1c354bd1f8f7c75977b SHA-256: 5dc766ff6d5b7cbaae5e3597483dd23e6d55bcd232ead073763820d32a80a181
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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.sec-ollivier-associes.fr/www/upload/file/rogazudojomitisarefixa.pdf In PDF document text
    • https://aristi-trap.com/upload/users/files/zuruvaxexanajom.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/jirata.pdfIn PDF document text
    • http://alconburyreunion.com/clients/36523/File/bivunun.pdfIn PDF document text
    • https://fajndoktor.cz/images/file/files/65912677984.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/16081d36ee2511---82124345243.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/193d9d03bed6d00c64f6c6bff3f5e600/3876502934.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/2e51404e3b28555284b6697d6e8a828e/22237728335.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/50cj3uiq43382f4egr8mob1mje/70479794687.pdfIn PDF document text
    • https://kurtoglumob.com/upload/file/19386296377.pdfIn PDF document text
    • https://discovercefalu.com/_data/images/file/94491930955.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/rafopurasolebeputa.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160e6af4765293---95260262360.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/2199cdcdb68d10b3e5644edfb1ba087d/saxotevomiz.pdfIn PDF document text
    • http://chnli.tw/CKEdit/upload/files/zavesolagupajerejeti.pdfIn PDF document text
    • https://blueparadise.pl/userfiles/file/85495609295.pdfIn PDF document text
    • https://harrisitalia.it/uploads/file/puwozegilupik.pdfIn PDF document text
    • https://hogies.com/includes/template/uploads/file/65996960439.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b3ef8984db4---fotovifiriputidobowo.pdfIn PDF document text
    • http://prabashproperties.com/ckfinder/userfiles/files/71223454572.pdfIn PDF document text
    • http://doverhighschoolhalloffame.com/clients/2/2d/2d76883e1086210ef8e2c43836b0327f/File/57666433010.pdfIn PDF document text
    • http://maslag.eu/userfiles/file/narikaguworasud.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/4554e0cn7cdp12poa0r8e54mi6/37845945442.pdfIn PDF document text
    • http://medrea.ru/upload/files/35603884691.pdfIn PDF document text
    • http://internationalnetworksolutions.net/files/volutimo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=function+of+small+intestine+in+digestive+system+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_off0000ccba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCBA 17008 bytes
SHA-256: bca9eea5d59ae4d9f6afde31ff424f2e75550e9e43a006d6de12e4f27bdf6b6e
font_01_sfnt_off0000f8de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8DE 11120 bytes
SHA-256: e8054839e29b0a04c4dce5d427e921264e368cfee76a901052d939bb392064c4
font_02_sfnt_off000112a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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