Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4fc0c8f7f570227…

MALICIOUS

PDF

70.7 KB Created: 2021-09-25 10:09:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: df2d0dff45f1a0f5cb9490daf9a015c5 SHA-1: 0226858e3b0fb51b64ef78e76c2609803a3665c2 SHA-256: c4fc0c8f7f5702273928cba878935dbe66002744527ba5fb47ea6e0d8fe6ce5d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate it functions as a link farm, directing users to compromised CMS uploads and SEO-poisoned domains. While no scripts were explicitly extracted, the nature of the links suggests a phishing or malware distribution attempt, likely initiated via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d51791297361b60870778607353c5ec4/kazuxekeseloped.pdf In PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/f94762cb83fb75288f1753542baa8fc6/wovizuzavadegemivovur.pdfIn PDF document text
    • http://mariekevanvlierden.nl/survey/userfiles/files/24885556219.pdfIn PDF document text
    • http://stamforgtechnologies.com/uploads/sokaxuje.pdfIn PDF document text
    • http://vietsonplastic.com/uploads/userfiles/file/lemozujedop.pdfIn PDF document text
    • http://yousefmaktabi.com/ckfinder/userfiles/files/53947035524.pdfIn PDF document text
    • https://limsurempat.com/contents/files/xizimefiwefobonekavala.pdfIn PDF document text
    • http://huthamcauquanggiap.com/upload/files/witeresawevaz.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161496511b721f---gafatasenuramilim.pdfIn PDF document text
    • https://organicfertilizerproduction.com/d/files/wamugo.pdfIn PDF document text
    • https://perfecthospital.net/ckfinder/userfiles/files/timuwoxugoraxusagas.pdfIn PDF document text
    • http://mimarkamilozkartal.com/userfiles/files/20109963971.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/wivanodenutakotujuwijib.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/161470679aedef---70629377589.pdfIn PDF document text
    • http://reichspfarrer.sk/file/bakanefarefatunaw.pdfIn PDF document text
    • https://belretail.by/ckfinder/userfiles/files/dorapogixanajoxekef.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/c1ee53984dc6c2dc040ea75e3596a843/73888631196.pdfIn PDF document text
    • http://moderncarrent.com/user_img/files/90786408854.pdfIn PDF document text
    • https://hmradiatoriai.lt/images/files/27843496573.pdfIn PDF document text
    • https://bbox.ru/images/shared/file/18829975587.pdfIn PDF document text
    • https://villadorottya.hu/uploads/frontend/files/30094349436.pdfIn PDF document text
    • http://harringtonandlombardi.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/89892143651.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=red+and+blue+stickman+animation+parkourPDF 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_off0000afd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFD2 11052 bytes
SHA-256: 850b2b238448f87b3f253dff5ff22c601ccd05157c5864a14441bef94bd4228f
font_01_sfnt_off0000c954.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC954 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e166.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE166 17348 bytes
SHA-256: fd01202a140eaacd9b6e90451d784c4c42766e4a82007e68eb49f14720b973c9

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