Malicious PDF — malware analysis report

Static analysis result for SHA-256 865a9ec548aeb180…

MALICIOUS

PDF

106.6 KB Created: 2021-07-23 05:41:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 8f60b87077880dff2cd7157cef7a2a40 SHA-1: a7c7a3ef082532505133a1f9dce77241459c5268 SHA-256: 865a9ec548aeb18040193fe03aae600ca47536bbe01048872d5184c851a71805
156 Risk Score

Malware Insights

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

The file is a PDF identified as malicious by ML classifiers and ClamAV. It contains numerous links, many pointing to compromised WordPress upload storage and other unknown domains, suggesting a link farm designed to redirect users. The PDF's structure and the presence of embedded links indicate it's likely used in phishing campaigns to lead victims to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://asiajitu.com/contents//files/rakusetuzevomuzawaxutuv.pdf In PDF document text
    • https://ptkas.com/kingkong/userfiles/files/12677054209.pdfIn PDF document text
    • https://barrierball.cl/ckfinder/userfiles/files/nureku.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608647887a0a3---98849197301.pdfIn PDF document text
    • https://nusantarabet4d1.com/contents//files/57395481401.pdfIn PDF document text
    • https://ehotelgateway.com/bot/ckfinder/uf/files/rigibunomifojaniduk.pdfIn PDF document text
    • https://bibliothequeanglaise.org/upload/files/nugitogimid.pdfIn PDF document text
    • http://bpabv.nl/uploadfiles/file/bejolun.pdfIn PDF document text
    • http://mesahighclassof63.com/clients/79820/File/vikerefuxi.pdfIn PDF document text
    • http://luxe-pools.fr/i/File/gubawamapafulolokilono.pdfIn PDF document text
    • https://betenagro.com/sites/default/files/file/pafozetapuguviwafa.pdfIn PDF document text
    • https://fundacionamigosdelmarcaribe.ong/ckfinder/userfiles/files/35041166978.pdfIn PDF document text
    • http://ikoi-es.club/yamituki-n/uploads/files/feboxo.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609d517f7e732---11376507048.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/02ab679cc915a3731ed6232caeee7f75/zetabugo.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/darc32puit5ecn70aud6km9cb1/77609763030.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9e419ff3a---25925539958.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160762d152dc42---54644574133.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/16072180094762---jovubevuwizoxuxapalivemok.pdfIn PDF document text
    • http://everest-c.ru/ckfinder/userfiles/files/zofizinuxiweresolewifi.pdfIn PDF document text
    • http://jakebenmd.com/clients/0/0e/0eef9d569b11303d075d19626cc6f958/File/74893778765.pdfIn PDF document text
    • http://ordineveterinarivenezia.eu/userfiles/files/kelexekizizirofivu.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b27b4163553---79829862730.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/712f1226df28cc83e08c7abf32d1d952/58292279980.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=about+a+christmas+carolPDF 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_off00013f42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F42 10480 bytes
SHA-256: e63e489387e3efeb3aa2820f4e6baff26d0bb65ef9a8553059b48e3989b55b52
font_01_sfnt_off00015717.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15717 16808 bytes
SHA-256: 6ebc4a8c5277ce49b63bc662703f41bbd0c7014d990f95e8ab007f7ebb861542
font_02_sfnt_off0001828f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1828F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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