Malicious PDF — malware analysis report

Static analysis result for SHA-256 9628a7b33b513f6b…

MALICIOUS

PDF

84.6 KB Created: 2021-06-30 14:16:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 3ee7b1ae91e412e1b81739a5b9310e28 SHA-1: 58128a5c2ed63f2faa1159c6181831be15a9c855 SHA-256: 9628a7b33b513f6bf45163d9318d86bc2a98cc031abcda8f85f404e73bb01ca1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file contains numerous external URIs and is identified as a link farm, with many links pointing to compromised CMS upload storage and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, but the URL structure and heuristic firings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crysiq.ru/uplcv?utm_term=grand+hotel+kaohsiung PDF link annotation
    • http://stasta.com/userfiles/file/luxob.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ba8f449f7e8---42615237582.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0beb7202e9---33705299084.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/80752324476.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/tefifunavi.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608fc5e5b8140---wutubarivagofunekumamu.pdfIn PDF document text
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606d345b30514---dafasosibekuvagepi.pdfIn PDF document text
    • http://dalboncostruzioni.it/userfiles/files/95457334296.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/7e5af9031a1088baf95c9ecc13dd5f4f/basanibuxovinoj.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/06g303ucudatuekk8fae6cfkcc/19607370603.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/4ri9vo5gec5h1f3hop11o449ej/69362408084.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/d94830faac15e4f40ae510e1d2bf420d/fenegevexenovezeda.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8d0d2806c337ccc023ceea7105211fc3/retuwizino.pdfIn PDF document text
    • https://osakadentalcare.com/contents//files/busuli.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160780425ad454---virugotilovobepozexime.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ddbd642f7---jufulu.pdfIn PDF document text
    • http://ukwoodrecycling.com/userfiles/files/36513517673.pdfIn PDF document text
    • https://securitydm.rs/slicice/file/jibika.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/0622f3563284736cbe91ab1fabb5708c/vumudi.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/51e7d39f9ada62ce7ebc8dd126551817/sojese.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c7c2f2bd0a0---momoxolazagexisegafurati.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/16077b7cd7dde7---barugudunosokefudixoluja.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/16076240a392d8---31484364701.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/ujo0ae0to4gbvca0q140k8of64/birovezapi.pdfIn PDF document text
    • 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_off0000d9ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9BA 27680 bytes
SHA-256: d6095872ba083f5e07d905b634f8dceba1392f5dcb8e68ae8b4438e35a3af0d8
font_01_sfnt_off00011325.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11325 10756 bytes
SHA-256: 75450ec7ef66a9397d947f93c62bc07256d3b3402687751ac3792a8067637759
font_02_sfnt_off00012b9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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