Malicious PDF — malware analysis report

Static analysis result for SHA-256 3676e44f9873e0d5…

MALICIOUS

PDF

85.4 KB Created: 2021-07-19 21:17:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: c2042157b9ced116f8d9b61bdb279a5b SHA-1: 73f0ceb787a2b2228f548baa7b76a2975fcecf46 SHA-256: 3676e44f9873e0d5b5a91975626286a5213784f3f499fe167f2b332fdf2278c1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of links, many of which point to compromised CMS upload storage, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the nature of the links and the PDF structure point towards an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/be70d883f35759abcb23d55861575b8e/gupumudopob.pdf In PDF document text
    • https://hgb.se/filer/file/90544742794.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/fd6e02872ef9f78b28b8c8b8e34d66e7/91410439639.pdfIn PDF document text
    • https://roomart.uz/ckfinder/userfiles/files/zejunalaze.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/3e7c15db322bf6b14b84e412031ee1e2/49452253040.pdfIn PDF document text
    • http://dansecyr.ca/pdf/file/zexatojafepuzulafuzo.pdfIn PDF document text
    • http://ilturismoinitalia.it/userfiles/files/mobupodol.pdfIn PDF document text
    • http://es-manzokudou.com/yamituki-n/uploads/files/fovugapili.pdfIn PDF document text
    • http://e-cluny.cz/UserFiles/file/relavazukis.pdfIn PDF document text
    • https://ipic.vn/userfiles/file/dubasuwami.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075ded78823e---pupiruzajisujakifulevod.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160714de55d010---zamumarifevudojekuwozet.pdfIn PDF document text
    • https://hospvetcentral.pt/site/upload/file/polegozexute.pdfIn PDF document text
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/01ebvved1u5h3p75rsnnjh0l1s/zojatuzusamopowamawotoki.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160af57e1eaca1---15497512989.pdfIn PDF document text
    • http://tablica-nieruchomosci.pl/uploades/fckeditorfile/piniv.pdfIn PDF document text
    • http://magyaringatlanadatbazis.hu/dev/_user/file/20074425453.pdfIn PDF document text
    • https://leanuslab.com/UserFiles/file/37953670279.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aba006b303f---tuwovurawegedivutokaz.pdfIn PDF document text
    • http://lammensfilip.be/uploads/files/wusuterumejotopobab.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a349faa37f3---27001722997.pdfIn PDF document text
    • https://locoffice.ru/userfiles/file/63605977600.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=how+to+find+exact+probability+using+normal+distributionPDF 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_off0000e7c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ffda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFDA 17344 bytes
SHA-256: 6c130102387a1fbdc0f2d8acc71b08275e89fa8684bd92953de2f17793c50c04
font_02_sfnt_off00012d1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D1F 11496 bytes
SHA-256: f4f1104bc3b2bda2ad438d0b276f66f7678136dfba749e11ac37c4da1dbb1f68

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