Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4d929eb0c790a7a…

MALICIOUS

PDF

94.9 KB Created: 2021-07-23 22:08:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 27aff550232920004544e6ad8efb5a03 SHA-1: 8579d5dfafc2b2369e27b346f7810b715f590fe3 SHA-256: b4d929eb0c790a7ab484192e87d172ef4fa99e178efef3c1757e3600b351dff1
96 Risk Score

Malware Insights

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

The ML classifier strongly indicated maliciousness, and the PDF contains a large number of embedded URLs. Many of these URLs point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to manipulate search engine results or phish users. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

Heuristics 5

  • 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://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097bb0c391b7---vevumejepazilaxeredufoker.pdf In PDF document text
    • http://nowyhotelik.pl/userfiles/file/52627024574.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a82e22ed8c1---widivuwuboxa.pdfIn PDF document text
    • http://hintzfamilyreunion.com/clients/1/12/12a2788c5de59b93c87e4eff35998d4f/File/95529798468.pdfIn PDF document text
    • http://everettsbarbque.com/clients/b/b0/b0b566c85bab127526a414587b81487f/File/giwilolivizifojalijixa.pdfIn PDF document text
    • https://xlspandoek.nl/userfiles/file/10345793061.pdfIn PDF document text
    • http://wooshin.kr/uploaded/file/173739438260adee2cd604b.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/35419993360.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcf5f46668f---peganusiluz.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a17a1818238---laropikupif.pdfIn PDF document text
    • https://zapret-rf.org/web/img/podborky/files/89818395157.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab20af5ca53---sodenidor.pdfIn PDF document text
    • https://parvazyab.com/basefile/api203/files/12887356036.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/l4tlh10gf988ufsjmqr4csqtln/mukabenonivaza.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160c86573c1b12---41396991571.pdfIn PDF document text
    • http://longarmquiltacademy.com/fckeditor/userfiles/file/sevefigizevefoluv.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c15b9034922---88078735003.pdfIn PDF document text
    • http://brainbond.ro/userfiles/file/12082704.pdfIn PDF document text
    • http://roland-toys.eu/userfiles/file/64984572447.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/9f9np5ealmuflemthvm9djvr1p/jeperarozivofe.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b024fea9245---98942439651.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/k85oa108jabl8mfk46ja6d6t19/sefelusafuzilire.pdfIn PDF document text
    • https://designclarf.it/file/64465467596.pdfIn PDF document text
    • http://hanabi-la.com/uploads/files/64079211159.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/vipirak.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160de187beccc9---31497426360.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607308051501d---81497439253.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=historia+de+una+escalera+descripcion+personajesPDF 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_off00010d94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000125ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125AB 10728 bytes
SHA-256: c8ce175eb0969d2932d7905c66b59fa45a7192d39e93e8f64c7089144a47f1f1
font_02_sfnt_off00013e5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E5B 17592 bytes
SHA-256: 5d8289d56ea1632997e8a87d08122a9e1e33c179ae61bede71054a0458e692e1

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