Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5672ff024536da1…

MALICIOUS

PDF

84.3 KB Created: 2021-07-01 10:00:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 16466c99d9107aed50943ae6efa3792b SHA-1: 9af0cc208ac8ab3b201bdf2c51356d532fd5276a SHA-256: d5672ff024536da189d0fcd6d87473e1e6f52876e790686f39e4e4ed3a9e53cb
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to external resources, many of which are hosted on compromised WordPress sites. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely provides instructions to decrypt a password-protected archive, a common tactic to bypass gateway security. While no scripts were directly extracted, the ML classifier strongly suggests malicious intent, likely to facilitate the download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/d1i1nanqn58ibts36v7sqng38t/79935205306.pdf In PDF document text
    • http://residenzaeden-albisola.com/userfiles/files/tajagubasugurutasuv.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073233c9de92---16398246946.pdfIn PDF document text
    • http://isgsrl.it/images/file/fegivejaxigiwodi.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/wuwozopigatomubewibi.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/povum.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/it2ej4uhmsij50udt665gemlu5/28212061049.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6b6c53f4b0bbc01ad09948f5e5160608/bevejuded.pdfIn PDF document text
    • http://vasvaripalmuzeum.hu/upload/file/1563430827.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/dfa5b785edc768baa96e0704b0d4fda6/rexunugewuxodetezi.pdfIn PDF document text
    • http://ubest.ru/images/file/jitegivekeji.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c535bbf1bf0---lapoberuw.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7040c882cda8884381b9672da6ee460f/pikeja.pdfIn PDF document text
    • http://nkcophs50threunion.com/clients/0/01/014062e559e26c1cf0711bcec4e573ae/File/36634509800.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/9e69ce73ce43b202b3a18f45113ca37a/25232701655.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16094282aa55e6---bubawejubudipu.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160be57580669e---bozokenukobixuwu.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a275b36a0a0---warebinorolokesopuzib.pdfIn PDF document text
    • http://arenda-v-novosibirske.ru/ckfinder/userfiles/files/xenoxoveliw.pdfIn PDF document text
    • http://vizesblokk.hu/files/file/65996274905.pdfIn PDF document text
    • https://veterinarycarefoundation.org/userfiles/file/47412667569.pdfIn PDF document text
    • http://letsbelegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/27234972472.pdfIn PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/94b3ab209e9afdf98e2c8ef31da1c20a/4674400200.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=manual+of+instruction+for+water+treatment+plant+operatorsPDF 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_off0000e33e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE33E 10820 bytes
SHA-256: 3477b17fdaebdf6b0a123f83e1d8b7b6770d07f1324145427bad129618714944
font_01_sfnt_off0000fc49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC49 17172 bytes
SHA-256: 1e154cc40e49d9c46c1c48448e0a98e11129f4a5aca2467c042c80c5e09b7c61
font_02_sfnt_off0001293e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1293E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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