Malicious PDF — malware analysis report

Static analysis result for SHA-256 d73ca03522b627a9…

MALICIOUS

PDF

97.7 KB Created: 2021-07-30 07:41:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 7341c126c0a844ba7a27f39f1a8a9bb1 SHA-1: 7dcca689593388c14a262d1eb25618f4a35e81eb SHA-256: d73ca03522b627a954c180dc52bd8cbea70264a340eef0f8d177f0e4aa75f580
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to numerous compromised WordPress sites and other domains, likely intended to lure users to malicious content or facilitate SEO poisoning. The ML classifier strongly indicated maliciousness, and the presence of multiple external URIs, including those hosted on compromised CMS platforms, supports this assessment. No scripts were extracted, but the document structure itself is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://olterus.com/contents//files/zegivapuxujisazijep.pdf In PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160937f843b940---79688758189.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/3fcb363f9d9070eb1de02f454a79154c/51613171570.pdfIn PDF document text
    • http://ranaghatpchsschool.org/userfiles/file/vabagom.pdfIn PDF document text
    • http://bandenplaats.nl/cmsimages/file/39861719032.pdfIn PDF document text
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/2190777206b3106d9822b433c5944cec/towimapizapejujefalu.pdfIn PDF document text
    • http://stevis.cz/files/file/27479719180.pdfIn PDF document text
    • http://majortaylorride.info/images/uploaded/file/sisusekopimapune.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/2jm1pmurj76rttuk2mqt04a2dm/wegobojepipopoxo.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a7212a81192---76943342796.pdfIn PDF document text
    • http://marcelponjee.nl/ponjeefiles/file/zeletedetonozizoluregag.pdfIn PDF document text
    • https://dacinsara.ro/fckfiles/file/letuzozofuvun.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16084e72fb2573---naxasenumumiw.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/9b9ab9e3aa693543487ca8704a6f2686/tesironefodufe.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd18aca5a8---49329662442.pdfIn PDF document text
    • https://carparts-fixture.com/file/file/35576410711.pdfIn PDF document text
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/bfn3kba2l6kocelbfmdtgr6rbk/lipefujer.pdfIn PDF document text
    • https://delphin-restaurant.com/ckfinder/upload/files/99130410876.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/75893343320.pdfIn PDF document text
    • https://nslogisticservice.com/userfiles/files/10497012985.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/jo6nu93go3h24hr9fgdjhsjdig/sofezabudesoxaketuwakaxu.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/5kgudjsibr50nmdntmq3833am6/93905658099.pdfIn PDF document text
    • https://www.nhabe.com.vn/ckfinder/userfiles/files/xomuli.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/a727d0b8c1aea6932dc68aa37d2ba1fd/6625028464.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=the+lottery+by+shirley+jackson+study+questionsPDF 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_off000119c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119C1 11152 bytes
SHA-256: a04e60b61d1f1ebc16e257b72fcb560ff072de4c70ad21449da40ba4fe80898c
font_01_sfnt_off0001338f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1338F 17144 bytes
SHA-256: 62c034cf0be654a9527000873916ce6571f98d0ae5a907e904d8b450f075fc14
font_02_sfnt_off0001606b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1606B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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