Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c1c653df427f3b2…

MALICIOUS

PDF

107.0 KB Created: 2021-06-26 15:47:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 4f04f5cdb7c0bacccc79fd8a5ebad675 SHA-1: 96c860768650ec8e60b3c408e9d05dea8c4781ba SHA-256: 1c1c653df427f3b20cf11976c425937a7299b5e0f05ee1d4ed545ba088b63c93
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The presence of a link farm pointing to compromised WordPress upload directories suggests an attempt to host malicious files or phishing pages. ClamAV detection further confirms its malicious nature, classifying it as Pdf.Phishing.Trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7fbd68e33a---94499872710.pdf In PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c576d706f4f---jizofekujukozikut.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075fc77e4cbe---73213971471.pdfIn PDF document text
    • http://syarmarka.ru/userfiles/files/10418153971.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/453e5d6c9b624a614f9faf5dd496b940/linesiriginiraledasarij.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/2de9707eec6b8afd7ed951580832b0c9/verekuxi.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/96qfvdkp2bnef96tdes66lp655/76398382500.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/zerabe.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c51f02a29c7---30274427505.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/sinoxirinamagi.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b5ec0cb47d9---36661956698.pdfIn PDF document text
    • http://sl1971.com/clients/5/51/517263f0417f9379c67e6eba0e0bdfe8/File/zukixivatobabisi.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/37586379652.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160adc56bc79f9---64480207168.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a21121dc9f1---vegumurijonoxovoga.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/4b8f35bfbf2e6f95c19e68de876c15aa/21944083299.pdfIn PDF document text
    • http://technoauto.jp/js/upload/files/35084456866.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d1ec72d2ae1---palisalifopamovu.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a145b32f574---67863957173.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd01d5b047---22503329047.pdfIn PDF document text
    • http://akekaluck.com/ckfinder/userfiles/files/bufezujiji.pdfIn PDF document text
    • http://www.bash.cl/media/file/wegelowinesus.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160886d041dfd0---68934600052.pdfIn PDF document text
    • http://coffee33.ru/archive/file/73466698848.pdfIn PDF document text
    • https://autoprofi.ua/userfiles/file/96114609446.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=beauty+and+the+beast+quiz+questions+and+answersPDF 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_off00013fcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FCD 17360 bytes
SHA-256: 2fcaf2f456e76c8988ad1109fc75697334d11fda09f40421e64c9d8cb5471ad5
font_01_sfnt_off00016ccb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16CCB 10996 bytes
SHA-256: 695b76668db6796d0e068f52ba392842ce36924efa10e3bf2a8e0796340d9f2c
font_02_sfnt_off00018634.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18634 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1