Malicious PDF — malware analysis report

Static analysis result for SHA-256 365f9ef0cc583731…

MALICIOUS

PDF

82.5 KB Created: 2021-09-06 04:19:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9c78ce89073f08c42ed42acf0b75a4a8 SHA-1: 09f629d6ce485f58332bac700db1aeefe6865c68 SHA-256: 365f9ef0cc583731430e7f7f11888c9404fa74259a2261d6957983e6d2df4bd1
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm for phishing or malware distribution. The ML classifier strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://coretry.ru/uplcv?utm_term=epidemiology+lecture+note+pdf+carter+center PDF link annotation
    • http://emotionpicturesfestival.gr/userfiles/file/savowefer.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/a3675c278e0d2e9fcb963a2f71281d8e/gizokodezofilor.pdfIn PDF document text
    • http://castel.lu/userfiles/files/najudegokejijumufaku.pdfIn PDF document text
    • http://novichiha.ru/pic/file/70514962354.pdfIn PDF document text
    • http://pvvc.cz/files/74536316053.pdfIn PDF document text
    • http://lechioutdoor.com/userfiles/file/keruza.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/dbqn35eo92vnphr44u917ebdl4/33396676474.pdfIn PDF document text
    • http://buyyoutubelikes.com/ci/userfiles/files/barefelafati.pdfIn PDF document text
    • https://bluetact.com/locktactyuma/userfiles/file/pufadumitirevodut.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1612be9e61df95---vibogezunedosevomev.pdfIn PDF document text
    • https://digireg.nu/upload/59282436572.pdfIn PDF document text
    • https://kermiradiatoriai.lt/images/files/pokumejaxupepuwiwaxuw.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f6f488b4dc---8976209358.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e589c5e85ff---42651098353.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160777422d87e3---naturijibilufit.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a229b31853f---futagepop.pdfIn PDF document text
    • http://begues.mobi/userfiles/file/pojafawamifikodo.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1c4d429a3f---56698991209.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608da86bd63a5---fezakewezamokuwilapabaf.pdfIn PDF document text
    • http://architettotoma.it/userfiles/files/7086734780.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/v2a2f53fgh5lj0bj8osqruvmsc/puxerezunosenab.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16076a2c636aa4---ripuvuzufovekosikisit.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ee3b3ed2a56---kimofejufadiweku.pdfIn PDF document text
    • https://empresa-venta.hr/files/98058052731.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_off0000dedf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEDF 16768 bytes
SHA-256: e6f71c569e4ddeedc98af4b222fedd58b954aa732c4422765e2ef560e131ae66
font_01_sfnt_off00010a4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A4A 10992 bytes
SHA-256: 70a52c6fde2cc4129910266a7413bbaa57ba78cba6e147e62856f7ce58e00816
font_02_sfnt_off00012399.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12399 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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