Malicious PDF — malware analysis report

Static analysis result for SHA-256 57efc25d63e9e4b1…

MALICIOUS

PDF

90.7 KB Created: 2021-07-31 00:20:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 05b6dce67362527ba8dea0ea1187f5c9 SHA-1: 69deee03465ad31cdd985b450a0dd903df763d2a SHA-256: 57efc25d63e9e4b1b8488e9e595e42dcd0e721a43be0dbe416ce578f26c141c9
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress upload directories, suggesting a link farm or phishing lure. The presence of 'utm_term' in one URL further supports the idea of tracking user interactions with these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://philabc.ru/uplcv?utm_term=how+do+you+use+ogilvie+home+perm PDF link annotation
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/76269637ea191d77e7c197dc3cfc98a0/xogezup.pdfIn PDF document text
    • http://hyosangjo.com/userfiles/file/20210610205459.pdfIn PDF document text
    • http://unsersohn.ch/images/file/sosanirumiwoxuv.pdfIn PDF document text
    • https://tiemhoahaibara.com/data/dulieu/files/29213659252.pdfIn PDF document text
    • http://thegioituigiay.net/uploads/files/suderifobadebajululuzakiz.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607826e605355---61899280415.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160701a6e7dc21---59416515956.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/dde7d9e8ed3b5fd35768c13f45ab904c/vunamezokanovisof.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/nevifaropipifomoxuli.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/533aa75d0a4d3eab7a7812086d0c75bf/49763768025.pdfIn PDF document text
    • https://www.marjojaspers.nl/ckfinder/userfiles/files/vogoruj.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/25c845fa5234d6a0a990d72cc32cbcec/jureviwadu.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/a49ac57c293236b8b32f692efcd95ac9/xaxofoxero.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16092323780eb7---27658361574.pdfIn PDF document text
    • https://quangcaowebsite.vn/uploads/files/58308551945.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/68u2ed3065vm9lkuduhihhe04g/nipudunabonekozuboperiza.pdfIn PDF document text
    • http://automozg.by/upload/editor/files/midevasajanexiza.pdfIn PDF document text
    • http://mariopresto.pl/userfiles/file/xelozikofowuja.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/d0c73b30baf7312f838323c18478ed2b/99413362871.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/80856716482.pdfIn PDF document text
    • http://apartamentosalbatros.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bc8129dc7d---wesamavujeka.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae936f2d101---likubajekeluzipo.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/bcbc5d270fb357d73984037cd9a3d58a/jojagi.pdfIn PDF document text
    • https://dorfadvertising.com/ckfinder/userfiles/files/guwisevigatetezese.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1f5b605909---zemip.pdfIn PDF document text
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/4e0f878aeb038f7c78065c136928047f/92583461761.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_off0000fed7.bin
cce2a87bff403fc64aea38ed61beda34e5703a83993534d8422c6e234ce13b06
pdf-font-stream PDF embedded font (sfnt) at offset 0xFED7 10832 bytes
font_01_sfnt_off00011794.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11794 16792 bytes
font_02_sfnt_off00012fa6.bin
b948d7457bf1d805ec03f9e1608493dffd0c3dc111e13ca248c69f9466a8a11a
pdf-font-stream PDF embedded font (sfnt) at offset 0x12FA6 17256 bytes