Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad7a3fc13974a94d…

MALICIOUS

PDF

91.0 KB Created: 2021-06-30 21:30:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 4b1724e40de3a9526fb2e931e5a95d70 SHA-1: c885583ad3a3f84bd95e9e77a414a8f34cc2894e SHA-256: ad7a3fc13974a94d1fb27b72a4f4811a8693e3456937abede56e089f18703923
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and link farms pointing to compromised WordPress sites, suggesting a phishing or malware distribution scheme. The PDF structure and embedded links are consistent with attempts to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://laborke.ru/uplcv?utm_term=homemade+cheese+without+rennet PDF link annotation
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160a61348cae95---21655402791.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc28466e68---56373476527.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160b9da1f33af6---2179433176.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/41a03cb905466a471078e1867e059558/89025680077.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/stl21d7mgpt8i04rif3msnjtaq/jijobomapariposiv.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/33266996275.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/84403067984.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/jipug.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/9b11cfc1dcb7eb95db78a602f8bff616/bukibomuwiz.pdfIn PDF document text
    • http://hiddenforrest.net/clients/76790/File/bofig.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/956d92426b076d2e95e7597c4d18acd8/67152797715.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/257656272ba97fd6006fecedfc24224c/43710446258.pdfIn PDF document text
    • http://homeopathyhk.com/files/vudenukalowuva.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a029a8d233---56506189149.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/simupurekegopurofiron.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079d03ce6de9---54601979661.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079b9d2da4e6---katokinewikidobatowupo.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/mv2sei2j43ef9k955idtlr4hd9/18354761008.pdfIn PDF document text
    • http://www.reenactmentmarket.eu/images/wyswig_images/file/divirodisateja.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160ab5232c00f0---18670934405.pdfIn PDF document text
    • http://trungtinjsc.vn/upload/FCK/file/visepuwa.pdfIn PDF document text
    • https://travelsafeway.com/userfiles/file/panoturi.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7111cce6d---zusope.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160945ee5b9a72---fuzogugup.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/kjm62skse579stbvo1oeiqa9f6/bamositofogabimofipup.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609afae367e9c---jefozabobel.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608e086c75764---xumalivinelodatifugimosuz.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_off000100e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E4 16532 bytes
SHA-256: ae6a81294e6aa21885697df8b067c105a9d1efe528ef8ac0132cb56d13ea5ecb
font_01_sfnt_off00012bd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BD7 10764 bytes
SHA-256: 0b8f871703c6c9b7155fd4e104f60d72382b11e5af887253054d301848868e97
font_02_sfnt_off00014471.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14471 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1