Malicious PDF — malware analysis report

Static analysis result for SHA-256 85b5c9b378b78225…

MALICIOUS

PDF

98.9 KB Created: 2021-08-03 11:50:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9fe90ddd14aa238adab54d678f0620cd SHA-1: 9d4f80c964ffa7ea10422b303cb4967adc070235 SHA-256: 85b5c9b378b78225178411589f4814e4a8b208ff0f2b6620a0494f72c0a167be
116 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of an IP literal URL and the ML classifier's high confidence score further indicate malicious intent. While no scripts were directly extracted, the overall structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070bf38724de---73994255620.pdf In PDF document text
    • http://riskhedgetech.com/uploaded/file/40874583460dc91a738e5b.pdfIn PDF document text
    • https://actor-conseil.com/files/file/sotuzevorukon.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/10587561753.pdfIn PDF document text
    • http://55thocscompany.com/clients/62662/File/15255171112.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/pugap.pdfIn PDF document text
    • https://mttrasportisrl.it/dati/upload/file/13924710418.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160914c6ea9cce---tegil.pdfIn PDF document text
    • http://odessahighschool1970.com/clients/7/70/70263b1be1b93b62200e198143f59f20/File/dagovosixepuvokiwuratez.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/51866225900.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a64a09758d0---zejuwoxexibonos.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/zujisaxuxugixat.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/99942336507.pdfIn PDF document text
    • http://157.230.241.115/image/upload/File/bibopijapole.pdfPDF link annotation
    • http://augustaelectricalwork.com/editorData/file/45945115219.pdfIn PDF document text
    • http://sehs67.com/clients/e/e0/e078d4d0076166a7bb489ca3b3a583ab/File/bofufiguxulepasaju.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608673bddc7cd---gufamozivesewip.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/25550121647.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/putazisazikokipikuba.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/dupixaxapegirona.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/dcd20df3468f4ae62aa72a2372280ce1/78429820379.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4bc5c61d9---garezebufozobuv.pdfIn PDF document text
    • http://theurbanthinktank.com/files/zawetapake.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=an+introduction+to+political+theory+8th+edition+pdfPDF 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_off0001200b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1200B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013822.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13822 10952 bytes
SHA-256: ae34cb9e6e319f238b7646166fc550be03ceeea308688dabe81c1ce03e0b80ac
font_02_sfnt_off00015187.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15187 16700 bytes
SHA-256: 67fc1907c5b77b4c0f91d3cd793bb7952b7e412a2dbe7320355c7c01fba6b520