Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbb428c02e25e172…

MALICIOUS

PDF

85.6 KB Created: 2021-07-06 22:56:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 53be483270ba98efe5ff01e73a33a207 SHA-1: d83566f131d414ec83df51fef9e4835150ad02c7 SHA-256: cbb428c02e25e172f57be35c1a7fbc56a39af80e97907dcbe61a621273a13fcf
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is identified as a link farm, suggesting its primary purpose is to redirect users to potentially malicious websites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9765

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://laborke.ru/uplcv?utm_term=baby+elmo+and+cookie+monster PDF link annotation
    • http://placc.info/up_image/53228879097.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080baf9e10e3---dugetunaso.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/tn98fri8vfs0i1teotldq7ljr6/74479987533.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160718d018d0a8---fekewugovefolefogepejeni.pdfIn PDF document text
    • http://www.minaakshimajumdar.com/fckimages/file/47671446239.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/d76e27fea268db203f9ef0992bfbd1b4/dibidoworazuvebisotewe.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160723efdaf2ee---fopakekinawav.pdfIn PDF document text
    • https://fourseasons.events/wp-content/plugins/super-forms/uploads/php/files/2618888f390238cbf734508d227282d1/46498361452.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/c8eca5bb2a595740f6ed618383360658/garadunapize.pdfIn PDF document text
    • https://glycocalyx.nl/userfiles/image/file/96506666562.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c796f3000---rawadojapegibefuwe.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160700ab9943ff---2296734422.pdfIn PDF document text
    • http://clubmaniacr.com/campannas/file/99883501973.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/71mkcc8k1k4ptc5obmrtecghr3/rejipisekopelivovegiforel.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/tubugakimefomana.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b16b67a51b7---19627294047.pdfIn PDF document text
    • http://zuche0551.com/upload/file/88152492531.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/c97f43e5475ca7658cbfff2305eb4f9d/20353576341.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/ip4162bmg8dlrjt0madfalmgf3/wugeden.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/83129493912.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/s8060c93gaok4pakvqehb488lq/58742115799.pdfIn PDF document text
    • http://sbsinternationalschool.org/sbsisnew/userfiles/file/sotoxurimes.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/2021517170455251.pdfIn PDF document text
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/88285100182.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/wosugiror.pdfIn PDF document text
    • http://sequirk.ie/userfiles/file/gurimamoteloweto.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d264.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD264 10932 bytes
SHA-256: a98584cb72e3146f5f6020f96819c89e1a80bdf5e4b336f539d7716a7b24cb9a
font_01_sfnt_off0000ebbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBBC 17848 bytes
SHA-256: 3a961468c92b81f117229edbe911113fa09fcc3c07085c4f3a0bee38e01f32f7
font_02_sfnt_off00011a66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A66 16344 bytes
SHA-256: 5cd8a120e106fc2d4fc1855603a636a3ce922decfb1b4d98f17a4a5450337c58
font_03_sfnt_off0001305f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1305F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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