Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b5387b18544b4e0…

MALICIOUS

PDF

93.5 KB Created: 2021-08-09 14:11:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: d97c017fb89916d3ff22ffb8ead28935 SHA-1: 781c49e9a67826e704db4e5eb9000ba9deede601 SHA-256: 8b5387b18544b4e01dd65a85159003ae08d50c226cfc5ce49a31c422b08efdeb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://dewalt-naradi.cz/media/upload/editor/file/zerivazazuruvivuvagiv.pdf In PDF document text
    • http://goldenpoolandsauna.com/user_img/files/dorurafaboloj.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/ojs4bhtie46q9qcg33bni7a57k/rupupumepojexifebafe.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/8760169f6791dae61ad9e56aba69f887/gigesomonolanobavegobup.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/f36b8a9d569b64bd76ea5a2b96d49124/91928492671.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086bcbf8a821---webegatebesad.pdfIn PDF document text
    • https://burgas-remonti.com/userfiles/file/76223391739.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/22569419441.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c0b8722fe01---37370328641.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea69b2bd85---verigoginemasotikip.pdfIn PDF document text
    • https://smilaxlabs.com/userfiles/files/japozuru.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607eac9a3c1c6---44330805530.pdfIn PDF document text
    • http://dges.in/userfiles/file/nafalodolinimasipadatoler.pdfIn PDF document text
    • http://abwingsva.com/uploads/files/69318398655.pdfIn PDF document text
    • http://sun-eko.eu/files/file/sezakigekar.pdfIn PDF document text
    • http://m3hotels.com/userfiles/file/59980194848.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bcsucb3lf1amihsqo8cpsahtg7/61361331433.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/4da22e5126ef52c1d73b63a2948be0b5/fadetivuvuwel.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/4d0acc56c87fab0c6c02d77f35d4615a/65698436731.pdfIn PDF document text
    • https://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/gungsencd01m2qvd9kv76q5dge/71829818717.pdfIn PDF document text
    • http://coinproject.com/userfiles/image/file/pikelefedisamodulunado.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160bdefb8cbe09---4190579599.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/9235a51d10940ca534ae77bcf72576c3/ladozupipigibekipumok.pdfIn PDF document text
    • http://venusland.vn/app/webroot/img/files/negatad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=bhoothnath+returns+full+movie+free+download+300mbPDF 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_off000107c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C5 17052 bytes
SHA-256: 4035c655e44407a5e30cf43158ca96b7108bd6eb16abd79235e5e01bb80f39a8
font_01_sfnt_off00013401.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13401 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014c18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C18 11360 bytes
SHA-256: 759a8fd935a831bd9f95ec4b8dadbc00016ad458a96ddad429e3f75eaccdb032