Malicious PDF — malware analysis report

Static analysis result for SHA-256 a03ac5efbad4f215…

MALICIOUS

PDF

79.6 KB Created: 2021-09-02 01:53:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 85a278da2c6f5ade153c975a97f79d81 SHA-1: cb189a2aa47847ffb1a5b2c8fb1dca1f0545bcc9 SHA-256: a03ac5efbad4f215b096b88593e035dcfd85e586af86b9880614566b7f651fec
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites. These links are likely part of a link farm designed to redirect users to malicious content or phishing sites. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://infrive.ru/uplcv?utm_term=notes+for+12+chemistry PDF link annotation
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1a2e976544---netileribakabuxer.pdfIn PDF document text
    • http://computer-rudolstadt.de/upload/file/92894089728.pdfIn PDF document text
    • https://drsaman.com/files/gegepov.pdfIn PDF document text
    • http://designklasse.de/ckfinder/userfiles/files/29597622085.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/satenizi.pdfIn PDF document text
    • http://www.idukkidiocese.org/files/js/ckfinder/userfiles/files/69523721573.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1611d097a96d18---xatibimozanaxigiwabo.pdfIn PDF document text
    • http://chinalanpa.com/images/upload/File/mamugorevozosupudapefu.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072a5e352d25---45439184111.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/fiponeziwiladigasujiju.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1f8104c00---18583624657.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16073fa819de0d---73449105481.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac897b16e33---fedifowajasukotiwakaban.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/39613a9617ebf0fdc6f4853bf577ea4a/46746185495.pdfIn PDF document text
    • http://kerama.altrodesign.eu/ckfinder/userfiles/files/72777100549.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607cffc978991---dezekagagogawebexi.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9681b81af---76572025699.pdfIn PDF document text
    • http://paulsaperstein.com/userfiles/files/1162117163.pdfIn PDF document text
    • http://asvpp.fr/pdf/84194277425.pdfIn PDF document text
    • http://twilaw.com/files/files/zibege.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/3ae04069f5787450efee82f0416f973d/kobiritupo.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611628a7bd32d---litofinato.pdfIn PDF document text
    • https://aviatroglo.fr/IMG/file/walepujagat.pdfIn PDF document text
    • http://keifo.ru/ckfinder/userfiles/files/tedojer.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/e23770d9cd6007d7408c169bafc60e9c/30820829203.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_off0000d497.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD497 17040 bytes
SHA-256: b94a902fcd1d1dc5b946dce192ad620fda7f050345641155c16f75319176bb85
font_01_sfnt_off000100a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A1 10552 bytes
SHA-256: cb1be5140109e662daa3a196a7447fadb7f08c720e20a52ca65ba6db9d4f667f
font_02_sfnt_off000118e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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