Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2b7796e0ba3e3e5…

MALICIOUS

PDF

80.0 KB Created: 2021-09-14 16:54:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 363ce1dca9e2383e15802d1485228e0e SHA-1: 14b93e9e021c574b967baf9397833777c6a8bb00 SHA-256: d2b7796e0ba3e3e5a8f4c742931451c5340d7bbf2a7e31dcf797a0ef902fd689
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm. Multiple URLs point to compromised CMS uploads and disposable hosting, suggesting an attempt to obscure the final destination. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing or malware distribution lure, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • 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.
  • 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://bayanairag.com/uploads/userfiles/files/26940449812.pdf In PDF document text
    • https://vivekanandbawwa.com/userfiles/file/libipe.pdfIn PDF document text
    • http://cmorshomecareassociates.org/uploaded_files/userfiles/files/3961554183.pdfIn PDF document text
    • https://nsstore.mx/ckeditor/ckfinder/archivossubidos/files/pejifuziwupez.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/advlgokt1ojf00bp9lruumgem1/suvabewobud.pdfIn PDF document text
    • http://dochoiotovn.com/uploads/userfiles/file/90423329042.pdfIn PDF document text
    • http://maiodi.com/userfiles/files/52177294199.pdfIn PDF document text
    • http://5percent-design-action.com/upload/users/files/27604366795.pdfIn PDF document text
    • http://okna-stv.ru/userfiles/files/tiwerirovidenovaken.pdfIn PDF document text
    • http://fc-junajted.com/upload/datoteke/gozodot.pdfIn PDF document text
    • http://ipcmanpower.com/admin/style/images/userfiles/file/towomukovirozinedipevun.pdfIn PDF document text
    • https://funbugs.ie/userfiles/file/53843396379.pdfIn PDF document text
    • http://bamila.vn/luutru/files/78360775432.pdfIn PDF document text
    • http://flashdisplay.net/UploadFiles/FCKeditor/20210908012324.pdfIn PDF document text
    • https://asiapharma.la/files/files/18724969990.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/8r9dho9kkegj70apavq0l49g00/44909330927.pdfIn PDF document text
    • https://pr-dienst.ch/file/wivevuxoduzuxefebereg.pdfIn PDF document text
    • http://ifap.it/images/file/30635640638.pdfIn PDF document text
    • http://sintjorisparochie.nl/userfiles/file/gozulivezunenejides.pdfIn PDF document text
    • http://unewstoday.com/task/userimages/file/56090349386.pdfIn PDF document text
    • http://maydemtienvn.com/upload/files/19362933927.pdfIn PDF document text
    • http://mylivediamondinventory.com/uploads/files/93998944368.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/711c0393ce381795fbfbd51f4970e808/83622286283.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+make+a+live+wallpaper+from+tiktok+on+androidPDF 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_off0000d251.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD251 10728 bytes
SHA-256: 762d3c8e084cd69b11f40dbad177268542dae9e220cc88f4399cc1ff270bed8e
font_01_sfnt_off0000eae7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000102f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F9 18464 bytes
SHA-256: bdc6a2caf68072de0fda7c176d3033da9b6418ebdfa06de45cc2390609ab1383