Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3ec1cf6c859e615…

MALICIOUS

PDF

80.7 KB Created: 2021-09-21 05:46:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 717ed77b7998fabf1553dc0398be3016 SHA-1: f94a77a9866d500b5df5cfc156231e59fddfc9cb SHA-256: b3ec1cf6c859e615317039b9b654db0721ad056dc0f467d3771318cfd66f17ca
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories. Heuristics indicate this is a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16139e3c02b61e---82708711035.pdf In PDF document text
    • http://timebymtm.com/upload/files/60908258939.pdfIn PDF document text
    • http://rfinshaat.az/userfiles/file/zifabuvowoxopuwobesogore.pdfIn PDF document text
    • http://pcserviszlin.cz/ckfinder/userfiles/files/botavuja.pdfIn PDF document text
    • http://aliguoriarchitetto.eu/userfiles/files/xixoraworatozuxo.pdfIn PDF document text
    • https://flavio-tonon.it/public/file/35856171914.pdfIn PDF document text
    • http://rowadhr.com/app/webroot/upload/files/46474209093.pdfIn PDF document text
    • http://open.ua/uploads/ckeditor/files/tomiwijisojakomujibivetif.pdfIn PDF document text
    • http://theartofdesign.nl/ckfinder/userfiles/files/rudozibovipawaxafi.pdfIn PDF document text
    • http://tienphat.vn/imagesflashupload/file/12563423740.pdfIn PDF document text
    • http://nhasachthunam.com/upload/files/xewusimilozalebusedijinew.pdfIn PDF document text
    • http://cuathepvangohaiduong.com/images/ckeditor/files/tefadapemibu.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/c449ec781d1e4e102ab881dc0abbb2c8/71109454753.pdfIn PDF document text
    • http://sperrincaravans.com/images/file/tetosike.pdfIn PDF document text
    • http://frankifoto.com/uploads/pages/files/sanoraxe.pdfIn PDF document text
    • http://ecosdaliberdade.com/ckfinder/userfiles/files/1468654919.pdfIn PDF document text
    • http://huzatfokozo.hu/editor_up/soxomatezaxodux.pdfIn PDF document text
    • http://mayinmaunhat.com/upload/files/23702716161.pdfIn PDF document text
    • http://lonerangerfanclub.com/ckfinder/userfiles/files/37945063445.pdfIn PDF document text
    • https://marsanz.pl/uploads/fck/file/bikeponujezoxibudega.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613394144ac99---zowajefifabifumo.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613b1221edacd---gusagamix.pdfIn PDF document text
    • http://rungruangsteel.com/public/upload/userfiles/files/ragijokajaf.pdfIn PDF document text
    • https://cezartravel.hu/userfiles/file/kinuvirexavejerezomigu.pdfIn PDF document text
    • http://xn----0tbbbfo0f.xn--p1ai/userfiles/file/lefosonifanevejozoti.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=chakra+movie+telugu+onlinePDF 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_off0000d919.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD919 10676 bytes
SHA-256: 285af54d454bea201f3b6d6fdf18412afba363bc7bd24051c4526f8cef07dbdf
font_01_sfnt_off0000f169.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF169 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001097b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1097B 17224 bytes
SHA-256: e2667597cc70ad177191f2636faae2d43b1a3362674fd1f43071ef62ff2ca68b

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