Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5df861fea2fe33c…

MALICIOUS

PDF

69.5 KB Created: 2021-09-20 15:04:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2b4cfdbaa813e1610504fb934b0f4cf6 SHA-1: 8f1742af65be85d42f989587ea7ed1654e674265 SHA-256: d5df861fea2fe33cc4b1b5ee9d704903eb26295cf397a79393254e0952528ed7
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to a mix of compromised WordPress sites and disposable hosting domains, indicative of a link farm. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this is designed to lure users to malicious content. The ML classifier and ClamAV detection further confirm its malicious nature, likely for phishing or malware distribution.

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://queure.ru/uplcv?utm_term=android+10+notifications PDF link annotation
    • http://marketingnews.fr/images/file/nibiwidopajezedogeja.pdfIn PDF document text
    • https://dialogueinpraxis.net/files/docs/sugeserotalotupavomilo.pdfIn PDF document text
    • https://congnghiepxd204.vn/upload/files/99112800893.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612fffe933eb1---93729188006.pdfIn PDF document text
    • https://lotteppta.com/beta/assets/file/41659676867.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bafcc11502---16383077738.pdfIn PDF document text
    • https://bandotrading.it/uploads/file/823497647.pdfIn PDF document text
    • http://greenworx.eu/images/uploads/files/roletokixunafi.pdfIn PDF document text
    • http://bagliodeimille.it/userfiles/files/71384006270.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/161467da8a29e3---59118723553.pdfIn PDF document text
    • https://greenbins.ca/ckfinder/userfiles/files/47977568767.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139377e56d74---sifijonabugu.pdfIn PDF document text
    • https://lajovisena.com/gallery/file/17716236731.pdfIn PDF document text
    • http://teakdeck.pl/files/file/90210107667.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/8bce3edb3155957a62f5234f77b4038c/35678204702.pdfIn PDF document text
    • https://dichocungtoi.com/userfiles/file/30500014436.pdfIn PDF document text
    • https://deshpanday.com/ckfinder/userfiles/files/pavimovixalokuraravefewen.pdfIn PDF document text
    • https://godparents4tz.org/home/god/public_html/ckfinder/userfiles/files/4578764325.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/36d6dff67e1ccb8af804d3cc17e8a604/modozonuwiludazomajunuze.pdfIn PDF document text
    • http://vigova.com/Images_upload/files/89372363404.pdfIn PDF document text
    • https://burkina-businessschool.com/business_school/uploads/file/52824624105.pdfIn PDF document text
    • http://zehanbiopharma.com/upload/files/zususi.pdfIn PDF document text
    • http://storemisr.com/uploads/files/rorozanisanezoronim.pdfIn PDF document text
    • https://dennismaloney.ca/upload/editor/file/solewabizevenek.pdfIn PDF document text
    • 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_off0000b211.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB211 15248 bytes
SHA-256: 10ac4fc4bd072e852ca89ded4023c80e21f713cbca4065f9c405a22484ca4fa2
font_01_sfnt_off0000d899.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD899 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f0b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B0 10444 bytes
SHA-256: 721cfe9cb2e45ba2297ffd14e4fb4391c95bb8130ec259a91ee4cf31204df46d

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