Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac765586f9cdb206…

MALICIOUS

PDF

90.7 KB Created: 2021-06-26 06:18:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: cf0505c475998a4282dba025e6353e46 SHA-1: db636b035f3029e265fb37c53521b33f68c8d99e SHA-256: ac765586f9cdb2063f934a6340f924db90e8ea1a15bf3fd8c41d5a654ae78858
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, suggesting a link farm designed to host and distribute malicious files. The ML classifier strongly flagged this PDF as malicious, and heuristics indicate it's a link farm on disposable hosting. While no scripts were extracted, the presence of multiple download-like links and the overall structure indicate an attempt to trick users into downloading further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://wastran.ru/uplcv?utm_term=michigan+manual+of+traffic+control+devices PDF link annotation
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c105acdc5f---berirelazelujub.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160813f052465a---76045522673.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc0d56e0f6d---raruvebapavevureg.pdfIn PDF document text
    • https://aneri12.eu/res/file/tajavure.pdfIn PDF document text
    • http://bannermaul.com/userData/board/file/44986036652.pdfIn PDF document text
    • http://seamcc.com/UserFiles/files/woxidamobixolagi.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/snl3mn6o4pcee9k42mc0pusehe/muredisuferunebakulo.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160886eca2dac9---lumamo.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/51117602785.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2c7a16fc7---xakiruberuwafukovob.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bf8c7561e69---xaverugapuselad.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/7b27c5a154b4ff3260549c0d081e056f/27532269077.pdfIn PDF document text
    • http://macap.nl/app/webroot/files/userfiles/files/88079181862.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/065bb4d527ed2fc71197e453d8796e0a/rajakitomidug.pdfIn PDF document text
    • https://info-jimukyoku.jp/lot/upload/files/19302593595.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/388j6lqumlmd6etacai2ngreqt/12406045471.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/76634251352.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608f4f2c7c4d3---wopifuwumojezurinifa.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160adfcf19ea98---72806273092.pdfIn PDF document text
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c56ea2f0a3---giduf.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/96424783647510900cb40540e8dbec75/sejebewekur.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/10dd0b18dcd15b87c0139c9aa24861ae/69362789119.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bba8362440f---69802743855.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/27880079d49e6d081e9d2103432fc7ae/29645743916.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-4-30/20210430131301990296.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_off0000ff1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF1D 17108 bytes
SHA-256: 7d88cadc963b3da213374b93a0e84cce35b47c16b9ad3734bfcda02af6e6b613
font_01_sfnt_off00012bdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BDF 11084 bytes
SHA-256: 47782af9636590493bbadcdd029f5ee899db7bb62872a7e82d42ea0af8d7ba90
font_02_sfnt_off0001455e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1455E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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