Malicious PDF — malware analysis report

Static analysis result for SHA-256 2072ca87bac5d384…

MALICIOUS

PDF

72.5 KB Created: 2021-09-04 09:20:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 25de0a171e2ea2fae9badd0be7689dd5 SHA-1: 3a249f8f2f0690a6e2e956614510ca853fdfe9fe SHA-256: 2072ca87bac5d384272d34712d472d9fae76ea1329da1d304778cc0708a9544d
96 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://pascalparrot.com/uploads/assets/file/28098224783.pdf In PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/1ae3679a414a509e89005479f74c970b/rubevalewokuvazo.pdfIn PDF document text
    • https://geneticapanama.com/userfiles/file/51621352649.pdfIn PDF document text
    • http://bethtikvahevents.ca/clients/2/20/20a91c0cb94b02964b0d1c5d980f1596/File/gusojabamexedezexuleduv.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/2ca17cdc731971e51d9a1519d49c79be/bupigimurun.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c531e6e68f1---20513738401.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610f639834f75---63309265724.pdfIn PDF document text
    • https://cevhertemizlik.com/userfiles/files/vemoraxawuseg.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160a3f078d4a2b---75679185151.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130666b79037---15328755322.pdfIn PDF document text
    • http://gonvvama.net/filespath/files/20210820104350.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/34816934890.pdfIn PDF document text
    • https://heritagecambodiatravel.com/userfiles/file/sewogasoxufoxovabe.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c973533b4d---8331726119.pdfIn PDF document text
    • http://area100impianti.it/userfiles/files/livabegitepivupiwit.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a237cb1830---56674691895.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160fa7c7f00efa---kafavu.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/35052073939.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b03e190684a---81295900924.pdfIn PDF document text
    • http://kfbma.org/files/fck/file/63419481208.pdfIn PDF document text
    • http://thelonerangerfanclub.com/ckfinder/userfiles/files/11059596902.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16090410de2066---lipinavaxuxeteguta.pdfIn PDF document text
    • http://fonnepal.org/userfiles/file/fiwenutusobefubevubar.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/89159755409.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=dom+quixote+de+la+mancha+miguel+de+cervantes+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_off0000b901.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB901 11480 bytes
SHA-256: 25326a9b050b871190bac1b35409d4ad98983406802346001cbe4420f7a63dbb
font_01_sfnt_off0000d377.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD377 15688 bytes
SHA-256: 7cd2bbcbe78a4860d372cb5bf45a747ddb0807037b9bc7063ae9e6bba62ab03b
font_02_sfnt_off0000fba3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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