Malicious PDF — malware analysis report

Static analysis result for SHA-256 f447741541fb525b…

MALICIOUS

PDF

85.2 KB Created: 2021-07-01 19:15:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: bf28243b3e395415f8502a6126062f14 SHA-1: 7a0180da76f2d2589964a4d930a24c52a1150a13 SHA-256: f447741541fb525b4b14f6e007f146ba2f537efde3f577e384ebc00ba1bb3a43
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to websites that appear to be compromised CMS uploads, specifically WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. The file's structure as a link farm on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083cd362d529---56271213125.pdf In PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/cf1995198967a8835cc0ad3b5f9f02b2/25825708826.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c274969eb3---vadiji.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/qmo9fgqfoj6shd8vta6gct77s2/61323950962.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/9lpsi0ejjbgjflsmqp9ne98ma0/75152887038.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608d95ee765f3---93113246350.pdfIn PDF document text
    • http://architettoseneca.com/userfiles/files/wijujij.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160acdabf42031---diroborakevar.pdfIn PDF document text
    • http://firstcuwire.com/file_media/file_image/file/jumisor.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/sukikudovijonutage.pdfIn PDF document text
    • http://nextgt.eu/uploads/file/gexalekuladuwin.pdfIn PDF document text
    • https://samudra99.com/contents//files/52315343113.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090705a3bf17---60774640822.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/naxoresuwudilujopuxefi.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/kovejasulijafexakuwimunib.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/10301224950.pdfIn PDF document text
    • http://tfforming.ru/d/files/gifekefe.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/c188624d877b2dc3ce99f6a14c36f09d/sogewawuxipibovakopagi.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/16077f5ae71734---53403815265.pdfIn PDF document text
    • http://mesterek.net/tmp/jokabefikogati.pdfIn PDF document text
    • http://goraku-sangyo.com/userfiles/file/27978557882.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/gj4hk2gkqgnnrhp9kdu9cp5vn7/nefomevatupemo.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/0lvcouj0r3bg1g9po46pmc3qr3/fawipatotibofuvakago.pdfIn PDF document text
    • http://www.benyowsky.com/resources/files/81135576196.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=holier+than+holyPDF 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_off0000ebca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBCA 17508 bytes
SHA-256: 25818e2a928efe01ce31372b74896e4d78171a9210713e394ac4e9951c825a6e
font_01_sfnt_off0001192f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1192F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013146.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13146 10140 bytes
SHA-256: 7297c3d99afd2f7800e934de4ea44df8f83f922b85306e262b6399cfdc7dd4d7