Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cf50e36e16c8a7c…

MALICIOUS

PDF

95.2 KB Created: 2021-06-26 00:27:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 870d28e5a44fc1929354f606fca0e832 SHA-1: aaf75e92a7a846a9a04fb627eb9f70ca0b49731b SHA-256: 5cf50e36e16c8a7caafa6068bea772e1f9167b43156d33059b12d65e76862c4e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to various domains, many of which are hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure suggests a link farm designed to redirect users to malicious content.

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://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/7cafc2df9277a44ead4436a622067fbd/44934155460.pdf In PDF document text
    • http://gospel-pour-100-voix.com/fichiers/newsletter/file/49996250359.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/ohrfnsp1gjhi9ptfvb7m5ms5pc/zuzaxef.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c870367c5aa---jopafarenamut.pdfIn PDF document text
    • http://royalproductsonline.com/userfiles/file/rakupogikibadojopasajevi.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607684c55b9d7---6772227538.pdfIn PDF document text
    • http://artside.org/data/temp/file/51490460484.pdfIn PDF document text
    • https://p99.tw/pro_pic/files/leposusikalawoxewopofezo.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609044acc982b---58450657618.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3616d79271---30467825584.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/7t25k4it5qn4rjvd1ua2mh5rvf/jaxivesadar.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/af00675e118a787458f7be17a36d489f/rosuwatos.pdfIn PDF document text
    • https://proxus.nl/file/sodukepizowepekavuxo.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/f35a66c18148e7e5aa931d1563e5bb83/razabefojonaluvaxen.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/t29sksgnkvmbgpq4vu71uq25eq/nasogowit.pdfIn PDF document text
    • https://imagebuzz.net/ckfinder/userfiles/files/27853051266.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072b6f3abb97---6759816056.pdfIn PDF document text
    • http://viral-list-machine.com/ckfinder/userfiles/publics/files/govalaxokefuzumilusametu.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac907a5f511---1319411301.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160d649b5f1ace---zitojatibadovafo.pdfIn PDF document text
    • http://ural-resyrs.ru/data/file/19259938554.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=raid+shadow+legends+accuracy+needed+for+clan+bossPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f60d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF60D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010e1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E1F 18892 bytes
SHA-256: e081cc486268301366716fdb89dc9c820f6c74d5c9e9ca07354c004cd9f79a8d
font_02_sfnt_off00013f15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F15 11144 bytes
SHA-256: fb46909dc921c0913502903283b0da32e16c77b756ed4a0ef552feb59cfa47f2
font_03_sfnt_off000158dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158DC 16204 bytes
SHA-256: 87182b243460dea918596d3037f4802ab1ae8d6e248e9f9623f677a34ab0a0a9

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