Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3c5ffb7c6e7a1e6…

MALICIOUS

PDF

97.7 KB Created: 2021-07-14 08:06:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 62bb78056bb4c5aba5f268f6f6828957 SHA-1: b6079a631afb53a820cd21f94d37f74c736a2947 SHA-256: d3c5ffb7c6e7a1e64c0d441ab19c9ee6d328c43e067236b8fc8911ab4320a25f
96 Risk Score

Malware Insights

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

The PDF contains a large number of external URIs and is identified as a link farm hosted on disposable domains. The ML classifier strongly indicates maliciousness, and the structure suggests it's designed to redirect users to potentially compromised content or for SEO manipulation. No scripts were extracted, but the overall pattern points to a malicious document delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9898

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://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/2vgn40b8v1atmhf73qg6coofnh/2452609767.pdf In PDF document text
    • https://contactfm.be/userfiles/files/77373746767.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160774cf6f22b6---34722282452.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160eca673eab8d---mirix.pdfIn PDF document text
    • https://www.vbclighting.com/wp-content/plugins/super-forms/uploads/php/files/c35924b788fa1ad810f45e3fcaa98e97/vagebevudi.pdfIn PDF document text
    • https://otelnamore.com/wp-content/plugins/super-forms/uploads/php/files/3b94b5c2f1026ebe183b2f2022c5fd6f/kodojuvexurorewuxilegas.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160a9362205eac---xinunisufozogibiz.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608cfdb0c2927---rawuz.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/66269364034.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/lqfc4eqs9oric0kq4ge8rsamaa/bosinakajixazenepozivoner.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/ti206fhc7j95ok4kjdh9ehogvt/jamebokem.pdfIn PDF document text
    • http://versobrokers.eu/userfiles/files/62587578912.pdfIn PDF document text
    • https://cahayaapi1.com/contents//files/29111951861.pdfIn PDF document text
    • https://pmeds.us/userfiles/file/pasejexedar.pdfIn PDF document text
    • http://wksx.top/images/userfiles/file/35159686610.pdfIn PDF document text
    • http://copelandreunionla.com/clients/6/66/66f6f3de7053633686652f51c4c00696/File/71456916462.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/5e4d37ae73e89408b1fb18f0f973efd4/6306512244.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae0a2faef0b---38984658360.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/rarapepozafevojizo.pdfIn PDF document text
    • https://ideylia.fr/uploads/file/2366335181.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4300c9bbf8---kovenelisaxibinusedotimi.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/d3495ovn1e1qcc8qsho0p213f7/porojusaduz.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/9peap6h563cjco8goqdtffqen4/38333048708.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=bash+while+loop+command+linePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010000.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10000 18832 bytes
SHA-256: af9caa21d6445f92d4038f374526907f21e85f228ce9c1b06741d98d0a4db49f
font_01_sfnt_off0001326c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1326C 10720 bytes
SHA-256: 02e6786528a48baf04709e9a6c6004c36172d7382600becfc2ed789adc0b50f4
font_02_sfnt_off00014ae1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AE1 16376 bytes
SHA-256: 0c133022d1e9883d2ff7035cf84f1fa0be9cfa0d671266bc5a940283bc0f9855
font_03_sfnt_off00016109.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16109 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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