Malicious PDF — malware analysis report

Static analysis result for SHA-256 f57299f1898a487d…

MALICIOUS

PDF

89.4 KB Created: 2021-09-02 19:48:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 228cdd42b34a1b031c7247a7c9ee2ec6 SHA-1: b6745896761fef1ee144c14a9ce80f98b3402d32 SHA-256: f57299f1898a487d2b63421cb439b358de1fd3ea57ae4c49ae8e2669d3225c29
116 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting it's part of a phishing campaign. The 'SE_CALLBACK_LURE' heuristic indicates the document's content is designed to trick users into calling a phone number, consistent with tech-support scams or callback phishing. While no scripts were directly extracted, the ML classifier strongly flagged this PDF as malicious, and the presence of numerous embedded URLs supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://selispin.com/calisma2/files/uploads/19249737609.pdf In PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16106234848ca0---boduvenorisaxon.pdfIn PDF document text
    • http://wingmanresearch.com/userfiles/files/miwaladofojurun.pdfIn PDF document text
    • http://nwatchonline.net/userfiles/file/34428239618.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093e5627d99c---maneritugo.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/16075390e2143f---mexav.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16070c46d24760---sugowirigefezosulaliz.pdfIn PDF document text
    • http://gocep.org/data/userfiles/files/83511006648.pdfIn PDF document text
    • https://an-professional.ru/img/files/file/65343658767.pdfIn PDF document text
    • http://tamlaproject.com/userData/board/file/dofeliwanajov.pdfIn PDF document text
    • https://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/67282357753.pdfIn PDF document text
    • http://www.stemcellhairclinic.com/files/files/52458134994.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b362146a105---tenupoduvaku.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/qcchjnbc86u2hh9euf64ggt3a3/segas.pdfIn PDF document text
    • https://estduquebec.com/scripts/php/xenocode/lib/ckfinder/userfiles/files/94341372262.pdfIn PDF document text
    • https://aymexco.ro/ckfinder/userfiles/files/miweteguj.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/40452160967.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160931b58e43a9---rujovi.pdfIn PDF document text
    • http://ranaghatpchsschool.org/userfiles/file/38952661777.pdfIn PDF document text
    • https://bikeid.net/ckfinder/userfiles/files/57592681261.pdfIn PDF document text
    • http://jtylek.pl/Upload/file/podogafoviwiwixewumos.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161071b4a6d755---60955499192.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/kazun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=bushnell+trophy+cam+hd+wireless+2g+manualPDF 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_off0000f21f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF21F 11436 bytes
SHA-256: d68c5d9ba8f332e8a157b60a089058079b56edf782fb9478d3f35113fbca274a
font_01_sfnt_off00010cee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012500.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12500 19028 bytes
SHA-256: 05e32e690665fce6f616e798e6db47654da8e46d6f1955d085bd3e5299871a6d

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