Malicious PDF — malware analysis report

Static analysis result for SHA-256 286972b1d4289a8c…

MALICIOUS

PDF

83.6 KB Created: 2021-09-07 04:58:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c11d6ddc95f894bbf6a307071edd8ed3 SHA-1: eee5921a16ad6aa2d0dca07b4e094f4fe5bd1e0a SHA-256: 286972b1d4289a8c2a3e3186b164b6c3c54a37e4014afb023ca1c5321c618b5b
164 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a phishing or malware distribution campaign. It contains numerous links to external websites, many of which appear to be hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to obscure the ultimate destination. The presence of a 'download button' heuristic further supports the idea that the document is intended to trick users into downloading malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://nomylo.ru/uplcv?utm_term=doosan+forklift+parts+catalog+pdf PDF link annotation
    • http://interwork.sk/userfiles/file/38681761805.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/gusexenebuzugavo.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/g4hmb0jkpmd5kgu657d6k0oocd/vegavijujupegivudusenoxa.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608401e820d25---48940480355.pdfIn PDF document text
    • https://congchunghadong.com/uploads/files/vefaxatetapazedaxipura.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dd352581eb---98648879766.pdfIn PDF document text
    • http://emanuelarombiarchitetto.eu/userfiles/files/59374999853.pdfIn PDF document text
    • http://www.fuchingrading.com/upload/file/bagomafavowitikilezum.pdfIn PDF document text
    • https://groupunsur3.com/contents//files/92034844309.pdfIn PDF document text
    • https://happyfun.tw/uploads/files/202108280227164324.pdfIn PDF document text
    • https://hanahana.vn/media/ftp/file/bepegidajififusok.pdfIn PDF document text
    • http://www.darvidproperty.com/news/file/51805351168.pdfIn PDF document text
    • https://mimpiindah168.com/contents//files/nisemelur.pdfIn PDF document text
    • http://rc-modeller.se/images/file///pusuxogapisa.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102df622870f---rifima.pdfIn PDF document text
    • http://apsons.eu/files/file/bobifukilifalarelevigakam.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9f8b5719ea44b8a699f01fcd89f82851/835886260.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c2a97815968---mububo.pdfIn PDF document text
    • http://epoxidice.ro/mm/file/48282557233.pdfIn PDF document text
    • https://autotrans911.com/thread/admin/uploads/file/mojagarame.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/160b755ceb9ae1---zawul.pdfIn PDF document text
    • http://oprandi.it/userfiles/files/48133460003.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/0a5c5c7428f64779c3d7c12291a7195e/xogusux.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/b8d15e3f674d0a185a92d74068a5d550/62024160506.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6255a271b---nugalizuxa.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/161004c8f8b535---dakuzifabipalada.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_off0000e0d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D9 17852 bytes
SHA-256: e3f3b4048ee01e4454819dc5ffdaa92a7752c0bc2325360ffa69679c2ddd50ef
font_01_sfnt_off00010f81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012798.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12798 10756 bytes
SHA-256: 661517c47269c66ee3f9fe08c5224b563bac327c6871024e174cece227df575c

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