Malicious PDF — malware analysis report

Static analysis result for SHA-256 2787c86fa6f1102b…

MALICIOUS

PDF

95.2 KB Created: 2021-08-14 16:42:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 921ffd3d6ba04e57a987af0999cb715e SHA-1: 1f77c78d5e9a9a8beb88eb95cc9d13abee23a29d SHA-256: 2787c86fa6f1102b1f4bf9a2ed095c17a5f1b4ac6080b46e4db00adfd12a535d
164 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://ehsclassof88.com/clients/7/7f/7f6c4973f16106f9a1f2948091db50b4/File/sobaberi.pdf In PDF document text
    • https://0900107678.com/upload/file/wetuvuxav.pdfIn PDF document text
    • https://carlojans.com/cms/file/ponoriminatina.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c4ec817c273---wefebigotakewap.pdfIn PDF document text
    • https://fetogram.ir/images/upload/files/datakazo.pdfIn PDF document text
    • http://stonebreaker.at/bakakofadigogofa.pdfIn PDF document text
    • http://montgomery71.com/clients/34132/File/90692280381.pdfIn PDF document text
    • https://alutat.com/data/file/wumoxipovogepepimegumetif.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/5df3dad5b0ff32bf89eefa6ca036f5e4/romuzetabupujepij.pdfIn PDF document text
    • http://yoron.net/up/files/56061107147.pdfIn PDF document text
    • https://maconlux.lu/userfiles/files/gebazunukodeb.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dda26d0756---zaluzi.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/e695d6273df08186a160ffd2acb7071d/wixose.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/54909703364.pdfIn PDF document text
    • https://hyosungulf.com/uploads/file/fafuwoli.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/xiwalutamedaxuk.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1a06725a6---gotifakudafodoxulap.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/3fa88706e8fa6d573bb64e9e42108306/rafopuziju.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a227d436902---24230385826.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160be1cfbf1b42---fopavux.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160928ffa3b2f5---magavodewan.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/gaxeketebadurusop.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/rebebidiwojiz.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/1609db5fb21f66---11246802194.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=the+son+of+neptune+chapter+2+summaryPDF 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_off00011293.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11293 16864 bytes
SHA-256: 8662ab880770a1e5cae02595a2aded45b23ac5e3a408746b3afa693d37875e37
font_01_sfnt_off00013dda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DDA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000155f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155F1 10904 bytes
SHA-256: addb6b271ddf74e91a69402f781a859ea6f82fc27538dc05f0275c380c19fb4e