Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8ef5df1d53a0b08…

MALICIOUS

PDF

79.3 KB Created: 2021-07-02 03:31:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8792e7af0c72ddf1c7cadc0c49578243 SHA-1: 45d426787be6cd5b61807ad6db26b88b28676252 SHA-256: a8ef5df1d53a0b081f6ee89573a64aa2f90a6e81a654ea1332df2fe7da2c50b2
164 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains a link farm with numerous URLs, many pointing to compromised CMS upload directories, and a visual download button lure. The presence of these elements suggests the document is designed to trick users into downloading a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://lesura.net/userfiles/file/zumomivibolofitu.pdf In PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609b115dbd012---44234940602.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/mtmm9lgiikmabm6q4hvvluhg41/javulatumilenovazezumupep.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a16ee99730c---4945191904.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/nutitee2gt5j4i313jcvo0780h/1598432058.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607c97abe17b8---47418513461.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9d6af92286---96099755314.pdfIn PDF document text
    • http://scuderieverdina.it/scuderia/userfiles/file/linafavemobuxemimojuzikeg.pdfIn PDF document text
    • http://washchienluoc.com/upload/file/tafejanozud.pdfIn PDF document text
    • http://wurbs-hanau.de/userfiles/file/kejazabovesazowapurod.pdfIn PDF document text
    • https://erdenetpost.mn/userfiles/files/8065568594.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160790bc737b39---153283793.pdfIn PDF document text
    • http://katachizu.com/img/news/files/jokivijufebemebaw.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/efbace93079a233b663ecba2dda4eb6c/lidaxizibigosuviwi.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/0j6q2idhg2dif3tp4ida1n1pj0/kovewunazunovaranapurexun.pdfIn PDF document text
    • http://champaigncursillo.com/userfiles/file/8891210849.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/632d5b5pr5dpgvs96e34qjo5e4/sexapi.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/m8qd0bt6vjt041h2v5u0v7qqt5/tuvezupabanekaz.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/92121811593.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/i8rldpphhe3eo8crsmqokdh0u3/mitagasazupirebosof.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16080b4d9cbdae---2838350396.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a029e73e14c---rubedinig.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/a0c592c515e8f93c442302d7a3062be9/gaduriweminilomogafod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=download+2k15+for+ppssppPDF 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_off0000d115.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD115 10652 bytes
SHA-256: 77510e517ef27f4007c89d3b77d73249945da81fddaca70b30510393f86b38c5
font_01_sfnt_off0000e9c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000101d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D9 17520 bytes
SHA-256: c263f9b7e3e7301f403d2bb5384c0e5809b290d7c01bb2aefed70d1b359ed87e