Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d53e1db39e6816c…

MALICIOUS

PDF

81.6 KB Created: 2021-09-01 10:20:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2b16c73ff0d352bc7fccd7ae0dba61f8 SHA-1: e21398c72717575241b8b681df1dfc97d8b55ef2 SHA-256: 0d53e1db39e6816cc39126fe4bd0e9e6b8cb0917ba1e8c79edcad63cb8d4de18
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it's a PDF containing a link farm. Several URLs point to compromised WordPress sites or disposable domains, suggesting a phishing or malware distribution attempt. The presence of embedded JavaScript, though not directly executable in this PDF context, indicates a potential for malicious scripting if the PDF were to be processed in a way that allows script execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 https://guenangequitation.fr/www/site/js/ckfinder/userfiles/files/68322037232.pdf In PDF document text
    • http://willbramephotography.com/94330059608.pdfIn PDF document text
    • https://limblength-sldf.com/userfiles/file/lesuwewuru.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/nklia8usv3e9bmhfgo6d1f5r3g/pezusalebuwibigasubaf.pdfIn PDF document text
    • http://bortran.com/upload/image/file/20210513060825.pdfIn PDF document text
    • http://khmim.com/ckfinder/userfiles/files/90375274094.pdfIn PDF document text
    • https://birotex.rs/images/files/15581690914.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/5c92515d3087339137a3da5595fbf040/rulijadegulogewib.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e383f1f1e5---19085941193.pdfIn PDF document text
    • http://soundspace.eu/Upload/file/dunilisomujurin.pdfIn PDF document text
    • https://alev.az/userfiles/file/pufojedemavep.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/cd12b6b313551d8b14454adcfd1ac5f1/desuzubuxu.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609c78ef76ced---86940587225.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160702c7369a86---zijebe.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/tamapaguvopamigiwisukixuv.pdfIn PDF document text
    • http://tysons-cafe.com/uploads/files/mefuremobikadiwibabalom.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/7fd884a49844f1303cf5cc406712222e/jidodulodiwokebije.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/o2ivbs31erqobu0o11pmnau7oa/nimuwunajoki.pdfIn PDF document text
    • http://tele-video.ru/upload/files/27806378861.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/97110953916.pdfIn PDF document text
    • https://seedomoretravel.com/files/files/fazitiwufil.pdfIn PDF document text
    • https://codecs.ro/images/file/93889338170.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/cb3d55985219d24d7346f80245c806d2/93190443220.pdfIn PDF document text
    • https://xn--p3t29jo1ed4o4xw.tw/upload/files/damokexa.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16088d16375020---denokaxowunuguwekevuxeluk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=quality+control+test+for+tablets+pdfPDF 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_off0000da2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f246.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF246 11024 bytes
SHA-256: c695b9e28f540a5635da84deb77a04b2f4147a748a1a2f80f7febc4b0c3e87da
font_02_sfnt_off00010bf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF2 17024 bytes
SHA-256: e59b6bce0d7d3e0d84ba6dc67443264415d077cc6633a9c15cfa407af9301948

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