Malicious PDF — malware analysis report

Static analysis result for SHA-256 28a0a8a214746d29…

MALICIOUS

PDF

97.0 KB Created: 2021-06-26 10:59:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 1a0a3ef0366dd7b343d124f70764474b SHA-1: 1be4179f54e3defc44c8d8b15f7fdd5467cc2f5b SHA-256: 28a0a8a214746d29a6b52ff7d551ce459738667ae469a336d098b619b264e75e
96 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to compromised CMS upload storage, suggesting an attempt to distribute content or manipulate search engine results. The ML classifier strongly indicated maliciousness, and the structure of the PDF with many external links aligns with tactics used to host or redirect to malicious payloads. No scripts were extracted, but the presence of multiple potentially compromised URLs is a significant indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/1k7hkthj7sgfhrd1d6bumv1lap/bogupog.pdf In PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/5d35037748de988541ca38c1abbdf3d3/wugowomozune.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1609db9a904605---18251598318.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/vipalawewuvaxuwiraguva.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/504813f62ebeb9afb699d2ae5397197a/64788973840.pdfIn PDF document text
    • http://amdind.com/userfiles/file/20045802830.pdfIn PDF document text
    • http://garderoba.sk/images/_file/legajefojatavowaji.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd3d52c0f4---35012637182.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/b151sqinuthi6b48svjrjubh22/vurovalulemigililakukize.pdfIn PDF document text
    • http://cappellastudio.it/userfiles/files/70025852565.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160800d4bec26b---75184283181.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a99b1dd8e10---99034400763.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/853f76f367425e51a5af845e23f93e1c/95727514135.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/zezeroleropezizewonit.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b06152dac0b---65089238624.pdfIn PDF document text
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/c09e7f78dfc746af1be3e51978dfed5a/19832432721.pdfIn PDF document text
    • https://lastcallslc.com/wp-content/plugins/super-forms/uploads/php/files/8a14012959fe0143f8425219c2e06aef/27013130235.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075ced227cf5---jexalofa.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082d28a35240---70529989690.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/e652e63164a9734de61a255ffac21233/nititimosalirodinupiz.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/5e485e93329b2bb3409364a63db81c2e/68281593337.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=human+herpes+5PDF 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_off00011ba0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BA0 16552 bytes
SHA-256: 3a69a190d0b661e81851e050a375eaae8a57b531aa56985dee69accae88b4c3b
font_01_sfnt_off0001466d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1466D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015e84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E84 10384 bytes
SHA-256: 175e6fe2e0983e01ed8c11757f03e6eb5aff142257109d25b36c3e44add82aec

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