Malicious PDF — malware analysis report

Static analysis result for SHA-256 8725f72a45075d13…

MALICIOUS

PDF

81.2 KB Created: 2021-09-03 06:27:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 818ff28264411ed481ffc36324a348d8 SHA-1: b8dba36846db25908c6dd06683b3f788eb0a4b92 SHA-256: 8725f72a45075d13bae16f6c2f3a8e9e44ee5e6ada73e6d0a3467780ef47ee21
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded URLs, many of which point to compromised WordPress sites. The ML classifier strongly indicated maliciousness, and the heuristic firings suggest this is a link farm designed to redirect users. While no scripts were extracted, the nature of the URLs and the link farm structure points towards an attempt to distribute malicious content or manipulate search engine results.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 https://pixomot.ru/uplcv?utm_term=les+14+besoins+fondamentaux+de+virginia+pdf PDF link annotation
    • http://trungtamdaykem.vn/Images_upload/files/bezogujowupilaziwewezuw.pdfIn PDF document text
    • https://genegurumiraclehealer.com/userfiles/file/54953602258.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/f99235ff9fbf6f31c205f8d9063697ef/79225291363.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161272bccbbad5---dekevinapuzujagopipajel.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/5275b2c670037ae339fd8943bb973118/paxub.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/g2tc5hl9qe9cvguif40lbuha8p/nojirobuxif.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/63b5cf1d1f5ae88ad4576de1306a5d20/88678888847.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/ab147407180eaa63762c9f5b060ece8a/20246949008.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d46d173e33---33336227263.pdfIn PDF document text
    • http://abwingscolley.com/uploads/files/94975138215.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609934d09b7ce---josanadixenuvupigudelidov.pdfIn PDF document text
    • https://10glazsikeyrosa.ru/file/99756030027.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/d7524009b6bf9095d07e99c61cb9a91f/41560902965.pdfIn PDF document text
    • http://msiutilities.biz/documents/sawonasasavubugivovepimiw.pdfIn PDF document text
    • http://systemsbiology.at/uploads/assets/file/99876389642.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160910db2035c6---74148208195.pdfIn PDF document text
    • http://zwickerfoto.hu/_user/file/66304725423.pdfIn PDF document text
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/a8d345c2ac7db3873d8b38a0401e6029/98740624067.pdfIn PDF document text
    • https://kopari.hu/files/file/dunasufozeraw.pdfIn PDF document text
    • http://engineersclasses4competition.com/files/others/kiniduwefal.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c23b918288f---kojigeboxotojolifus.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/7586493fcbc501e73742b898ff5d4569/jopifebosinazuvamek.pdfIn PDF document text
    • http://yummyschool.com/_UploadFile/Images/file/tajidajarabigad.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_off0000d64f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD64F 11292 bytes
SHA-256: 3d72bdcbf3463991b872e5ab2734cd3ba0270e7301154b12d4cfc0495e5e8fc0
font_01_sfnt_off0000f08c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF08C 18412 bytes
SHA-256: c29602891257d175d268915492f6ca206207954b47db9d3b1a5b646c68a5fafc
font_02_sfnt_off00011ef5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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