Malicious PDF — malware analysis report

Static analysis result for SHA-256 a51d8108988c4e37…

MALICIOUS

PDF

142.3 KB Created: 2021-07-01 17:36:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 95fbb41df62838a51ff6b3d8de94f148 SHA-1: 3792648c0d2cf545b998fb34f358caa8a190a129 SHA-256: a51d8108988c4e3756a7ece1d6792256c190100d9c5babc7bde7b44902992811
96 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs pointing to various websites, many of which appear to be compromised CMS installations. The ML classifier strongly indicated maliciousness, and the heuristic firings suggest this PDF is part of a link farm designed to direct users to potentially harmful content or for SEO manipulation. No scripts were extracted, limiting the analysis of direct execution vectors.

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 https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160dd7caa1c624---76276458472.pdf In PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/90aff1603e994a25451962844dba5941/jijelijisufazida.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7ea33e594f---91377062769.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/491d71322748e274c833182cc7ab5ffe/zeralatujowitanamupege.pdfIn PDF document text
    • https://actor-conseil.com/files/file/mifatebudozap.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/fe3099f994f14fe97a04be84823d8622/lowefepidoneli.pdfIn PDF document text
    • https://livre-art.com/ckfinder/userfiles/files/lidagadogutononokan.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac543d04259---zemegebufifopesobovukijum.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/9305752110.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d6c62e0aef6---zetisenajanolagerora.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/47063583423.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/5d27740d6f6506e8e4b945e935b49eee/tawadadixom.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd235fb7842---lipeneriwagazij.pdfIn PDF document text
    • http://synthecinter.com/userfiles/files/zulagakuzevumilo.pdfIn PDF document text
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/dee9f0e6094771795a9e24f4c564ba72/lopikexu.pdfIn PDF document text
    • https://ntpuvoice.com/ckfinder/userfiles/files/91768703152.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/9t5a6t569f1lqh87sqk534l6u2/56019402273.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/7d321c96adab9f971d4655cf8ac7889c/dezuzom.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/46219108764.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/dazaxiwe.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074742da2b03---70995992155.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=best+seo+companies+for+small+businessPDF 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_off0001cd2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CD2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001e541.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E541 17400 bytes
SHA-256: 58f9dff8dcebf9103ceaad82c403eebfcac042b4b8615212023a2e280e9c1048
font_02_sfnt_off000212aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x212AA 10936 bytes
SHA-256: 5ea93c046b80a6d6e8ca715693cc7b51a39d43e7668a62b40539229ce9945e45

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