Malicious PDF — malware analysis report

Static analysis result for SHA-256 83394d3bdd450342…

MALICIOUS

PDF

79.7 KB Created: 2021-09-19 15:46:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 648a566211ca9d8a60c54b3d62362da4 SHA-1: 18e1b208b4312944fd9c071c11fab25ecc7867b2 SHA-256: 83394d3bdd450342df1ce65815205c685682fcec32a5678c6d8ba0dfcb9ace1e
172 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external links, some pointing to compromised CMS upload directories, indicating an attempt to host and distribute malicious content. The presence of a 'download button' heuristic further supports a lure-based attack. ClamAV detection and ML classification strongly indicate malicious intent, likely to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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.
  • 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://garglob.ru/uplcv?utm_term=mmorpg+on+android+2017 PDF link annotation
    • http://masan315.net/board/imagefile/file/wadoretabazawifeganazo.pdfIn PDF document text
    • https://konzolstudio.ro/uploaded_files/file/gilej.pdfIn PDF document text
    • https://yesilkoyluleriz.biz/resimler/files/daxofakekodizudotupexojoj.pdfIn PDF document text
    • https://mkontroll.hu/File/wewapukajutuxujukiv.pdfIn PDF document text
    • http://massimosusto.eu/userfiles/files/56835810666.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/a4bd6eedcf22f54a282a638e465ded46/gibebesixajap.pdfIn PDF document text
    • https://turbooto.vn/upload/files/pipadavebi.pdfIn PDF document text
    • http://warehousetraining.ie/images/72532428556.pdfIn PDF document text
    • http://m3hotels.com/userfiles/file/mozodivokuwatosematixomev.pdfIn PDF document text
    • http://iwayman.com/uploadfiles/file/2109021207238693049aov5d.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/511093eb0cf9316980d6cb394661fbae/8708362889.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/sipedaname.pdfIn PDF document text
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rujarivevevigedofulerov.pdfIn PDF document text
    • https://longislandinvestmentadvisors.com/nini/userfiles/file/44465010535.pdfIn PDF document text
    • http://gold-carsales.com/js/upload/files/14420498034.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/wogoweramete.pdfIn PDF document text
    • https://khoahoc.timviec365.com/picturesfiles/53906170951.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/161465abda9dea---zugubidajakadavikafij.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613a08045fa5b---28281623395.pdfIn PDF document text
    • http://businessnavigator.in/ckeditor/uploads/files/21840614748.pdfIn PDF document text
    • https://immo-macedo.lu/userfiles/files/vixuperuzuwuwapelum.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/015d69a9af18e84cec8d63fb4030e3b5/53856563545.pdfIn PDF document text
    • http://weiken-rc.com/upload/files/kudeji.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_off0000d1a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e9bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9BD 10628 bytes
SHA-256: a8717ec17df44ddc3f53dd38b34c4cea937dc33918cab98bed1f5b712e792a49
font_02_sfnt_off000101ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101CE 18064 bytes
SHA-256: d58be07cd7afa8d8a4b05150caa6ab8504485444925a5b12791a1780e810a783

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