Malicious PDF — malware analysis report

Static analysis result for SHA-256 5043a0e33165a598…

MALICIOUS

PDF

80.8 KB Created: 2021-09-16 13:02:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8a5ff40878ae8d4f00bd21b19ac384ed SHA-1: d74119e16cc9233436c7e23ee33eccabfafc8333 SHA-256: 5043a0e33165a59842aae34e2f07cf3e92fe4bcfb0f21dc59318d5ef27aa8a25
96 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs, many of which point to compromised WordPress upload directories. The ML classifier also flagged this PDF as malicious. The primary function appears to be directing users to potentially malicious or SEO-manipulated content through a series of indirect links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://bctlorraine.org/userfiles/file/zabisatilenusuf.pdf In PDF document text
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/35806539308.pdfIn PDF document text
    • https://luiginoiobbi.com/userfiles/file/42496342120.pdfIn PDF document text
    • http://nineslash.com/user_file/file/32648211571.pdfIn PDF document text
    • http://colokit.thienlonggroup.com/Images_upload/files/vamusupikubufukabekoxek.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c9168a7841---52288780479.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161318742e46f7---muluvuvadojifezujupafi.pdfIn PDF document text
    • https://copperscrap.wasteequipment.net/ckfinder/userfiles/files/guwuponulizaxos.pdfIn PDF document text
    • http://banghetretunhien.com/media/ftp/file/fademufutovifenisanetef.pdfIn PDF document text
    • https://beytarimcilik.com/admin/editor_resim/file/sorujizulowisuxi.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/cdf3e9b35acc378751bc34782fc8b9d0/66466225637.pdfIn PDF document text
    • http://holidayinntorino.com/userfiles/files/jisamufokigimakogabijenin.pdfIn PDF document text
    • https://bibliotheque.ville.deux-montagnes.qc.ca/ckfinder/userfiles/files/soxanipigefebonukar.pdfIn PDF document text
    • https://koltoztetes-szallitas-lomtalanitas.excore.hu/ckfinder/userfiles/files/jeguwovonumasuji.pdfIn PDF document text
    • https://yocarbroker.com/upload/ckfinder/files/kuzimebebemasejafipodenij.pdfIn PDF document text
    • https://arbormaster.net/uploads/files/fadovukigipazubujekewokal.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/ad8da52dfa6a9aba0d426a050d44e88b/55763100366.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613db6f14b4a6---69104894971.pdfIn PDF document text
    • http://buffagiuseppeinfissi.com/userfiles/files/wenabefesumovuwutafawelo.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16139a4edc93bf---nekarimijomel.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/3537118161.pdfIn PDF document text
    • http://rybarict.cz/webpagebuilder/ckfinder/userfiles/files/zobowa.pdfIn PDF document text
    • https://commonwealthsportsawards.com/userfiles/file/69188249052.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/bjlb2qf79qb5lnl8gp6sqa9g1k/xokeb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=tronlink+wallet+androidPDF 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_off0000d7c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C1 18372 bytes
SHA-256: ea43055062dfc54189b44e7bf65880ed52c22c2a825e469d90b4466819ef49bb
font_01_sfnt_off0001071c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1071C 10216 bytes
SHA-256: 56aa477858b89272edde6a288d29a27cfa2c7ba91c39fb4fcf8f540e694dc3de
font_02_sfnt_off00011e2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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