Malicious PDF — malware analysis report

Static analysis result for SHA-256 22c3cb3acb507807…

MALICIOUS

PDF

93.3 KB Created: 2021-09-04 06:21:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9ce0a4486b16a2553600c73fb2f2423e SHA-1: 3745d8f0e592c9a5b5d4c4a5cca84e3e754e6dee SHA-256: 22c3cb3acb507807768595ff02a5df9ef548e49214c3a11bcfb334f18bd37a74
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains numerous embedded URLs, many of which point to compromised or disposable hosting domains. Heuristics indicate it's a link farm designed to lure users, potentially for phishing or malware delivery. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 8

  • 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.
  • 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
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://sjar-tech.com/uploadfile/file///2021052901002070.pdf In PDF document text
    • https://edusfera.pl/upload/file/sezevesugixulerimidokuma.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/970ae42fd7233e75d5471a69156edf29/12211307569.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1610649aa5cc9e---kedodozerakolixakoluwuto.pdfIn PDF document text
    • https://varbackaforskola.se/ckfinder/userfiles/files/lagegapudosun.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/16111b8b6a4551---57665486896.pdfIn PDF document text
    • http://bora.su/ckfinder/userfiles/files/zagamefuzedat.pdfIn PDF document text
    • http://rockycheng.com/ckfinder/userfiles/files/2417455665.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610cbf759c6e8---xudawona.pdfIn PDF document text
    • http://studiotecnicobonoli.com/userfiles/files/78614811175.pdfIn PDF document text
    • http://koslita.eu/ckfinder/userfiles/files/32196726291.pdfIn PDF document text
    • http://michaelwilliamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/77476773332.pdfIn PDF document text
    • http://karthikeyanjayaram.in/userfiles/file/pivibe.pdfIn PDF document text
    • http://aj-logistics.com/stock/userfiles/file/54565025709.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c036bf82047---2662667466.pdfIn PDF document text
    • http://farmaciafoglia.eu/userfiles/files/77974869240.pdfIn PDF document text
    • http://aodaibooking.com/FileData/ckfinder/files/20210718_AC80912A4A66F656.pdfIn PDF document text
    • http://telmeed.com/web/ckfinder/userfiles/files/mabok.pdfIn PDF document text
    • http://gabortech.com/admin/file/51973394275.pdfIn PDF document text
    • http://www.likoda.com.tw/upload/ckimg/files/16339543829.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/xesemaxofojefavoxixiduf.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/vrpp7rpltsuk8srtqi857928o4/dewuziju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=juntar+pdf+no+smallPDF 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_off000101d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000119e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119E6 20332 bytes
SHA-256: 8f0984dbfb926b509ef87fbb5f1631e66c48d65b61c5ca854b9ae129e4c43da4
font_02_sfnt_off00014ffe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FFE 10524 bytes
SHA-256: 493bc1e48c599d7037be25ac673bfa25b1b910b4e44a356fcc68c1b5ba03770d

Open this report in the interactive analyzer, or submit your own file for analysis.