Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cf0da3fbf54cf8c…

MALICIOUS

PDF

76.4 KB Created: 2021-06-28 16:48:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 518e71e070e7b055caf181d834ddcaf2 SHA-1: 984aafe73d75375e51857cf999524bee1b218c97 SHA-256: 1cf0da3fbf54cf8c9a1ed316cd488c435252cc402b5816934a9c300398703d98
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites, likely intended to host phishing pages or malware. The PDF structure and embedded links suggest an attempt to lure users to malicious content, aligning with a spearphishing attachment tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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 http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/9f33223d643065ff494b46f39af36721/29004599549.pdf In PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/kkipfaqklc4d2pukhcv1vjvqn0/vakubogafipemedafidodoso.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609a8ccf3589f---dimovetaxo.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607edc2924c1e---30679239389.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/77811121484.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/f3b4185aa4470b995c21f9ad9caeadbc/25992149437.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b46bf88ffe9---vedolumulol.pdfIn PDF document text
    • https://mimpishio2.net/contents//files/79975471029.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/5988017459.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/kudunekasom.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/enoepljkn7k4svsehqs61897d4/6880652572.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/n25lvn141rjdqcoi3n5ob85bg7/56662491480.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/jp4k9kvj0omrnlq1kllu3avub0/timigikusepesujiwus.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210507100601.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9f9500cc9---45715459481.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160a4375363e31---zepafukubalatog.pdfIn PDF document text
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/13118602844.pdfIn PDF document text
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/034cb581529e02d86c4e0f8b8d1ac1c5/zebodidusugifiv.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/5d1ef94ee2ab0feda4f0fb8f97d3ca47/nuzisajikesakumuvadigezeg.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b51c1f133b9---bizufu.pdfIn PDF document text
    • https://airshow-bg.com/file/vujufudagekej.pdfIn PDF document text
    • http://www.majbrno.cz/uploads/files/21740996087.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/2cb18972b628fe8cc43c069d1c4d4e12/lotogazosodexenepuzezovuv.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/a6a0ceae64aa221d3f73d2ae4d02676d/85019779590.pdfIn PDF document text
    • http://dreiseengrundschule.de/files/tuwowulezesipisofojuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=picture+of+a+manualPDF 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_off0000c835.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC835 16376 bytes
SHA-256: a8e1f227e30543bed6b08c3be520980b4b10b207319a3278067f8f34a9c02281
font_01_sfnt_off0000f312.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF312 10428 bytes
SHA-256: daefe1ddbffe43818571105923d6bf02ee3720d50dc0520b35ab209e001dce65
font_02_sfnt_off00010ab4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1