Malicious PDF — malware analysis report

Static analysis result for SHA-256 33ec55b788bd5587…

MALICIOUS

PDF

88.0 KB Created: 2021-09-12 11:48:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ce4e0b58e8c1ec6313c5827b8bb05483 SHA-1: 07b0f1b4e0a6a8cc19c5df5669f707f47211f973 SHA-256: 33ec55b788bd5587617d5d5d2fc81a4273bfff90c270fd84270a39ea9d940892
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous external URIs and links to compromised websites, suggesting a phishing or malware distribution campaign. The presence of embedded links and the nature of the heuristics indicate it is likely used as a lure to direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://philabc.ru/uplcv?utm_term=temple+run+game+in+download PDF link annotation
    • http://www.tractortools.cz/ckfinder/userfiles/files/fifewawaxadasewawubiz.pdfIn PDF document text
    • http://amongelite.com/ci/userfiles/files/95893808269.pdfIn PDF document text
    • http://edwardfmcgintypa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/15851423219.pdfIn PDF document text
    • https://bdaudit.ro/userfiles/file/tigodonijajorutereluxod.pdfIn PDF document text
    • http://modellszerviz.hu/userfiles/file/lewexita.pdfIn PDF document text
    • http://antonio-pelella.eu/userfiles/files/jejezot.pdfIn PDF document text
    • http://recit-de-vie.fr/userfiles/file/55300652990.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d0ace04df1---juvonufijare.pdfIn PDF document text
    • http://www.saletime.gr/admin/fckfiles/file/woxide.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/cg7uqok9pjh4ib8ldkr8ropuv1/38085842463.pdfIn PDF document text
    • https://iwanbim.com/userfiles/files/femusifuli.pdfIn PDF document text
    • http://101eyewear.com/luutru/files/83940406226.pdfIn PDF document text
    • https://monyetjoget.com/contents/files/gamudomudawugexuxisebe.pdfIn PDF document text
    • http://cpk.by/ckfinder/userfiles/files/tofuvolepawupoxenogu.pdfIn PDF document text
    • http://chemonova.com/FCKeditor/file/xufegesafalitijev.pdfIn PDF document text
    • https://sikdercollegeofpharmacy.com/scp/ckfinder/uploads/userfiles/files/bumovezi.pdfIn PDF document text
    • https://printjet.pl/pliki_user/File/45333158485.pdfIn PDF document text
    • https://araprinter.com/ckfinder/userfiles/files/mijuzejiminepilomapej.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138f0ccad56f---77168142221.pdfIn PDF document text
    • http://tw-sincere.com/upfiles/editor/files/juwepimusovitagozomupaw.pdfIn PDF document text
    • http://brava-ekb.ru/userfiles/file/vizegekifaxezotozezewag.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/14e26a772cd4ba7275f91df77d4c3038/niduwupof.pdfIn PDF document text
    • https://editions-tlp.fr/ckfinder/userfiles/files/82705433338.pdfIn PDF document text
    • http://zezoalza.com/ckupload/files/rotixoxegeza.pdfIn PDF document text
    • http://sadiqandsons.com/userfiles/files/rolodaragir.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_off0000f194.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF194 10620 bytes
SHA-256: ce1434442317d35a182d4059023cb123a5ff4354e1848b9600b1f68e2b33ede7
font_01_sfnt_off00010989.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10989 18904 bytes
SHA-256: d30c4774363aa94c21562c32ef06ded473fdd27b51a1702dbeda975188c984d0
font_02_sfnt_off00013a3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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