Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e366552263fb05e…

MALICIOUS

PDF

80.7 KB Created: 2021-09-07 07:57:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4957cbc4ac3f695deeb4b3e95742b47d SHA-1: fa00cf82c2bb91337b6c364bf7a32b17773e8779 SHA-256: 4e366552263fb05e97264da431794ba4a50983e92cab068d201095e989dd8d6b
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, providing no direct content clues, but the heuristic firings strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://scherzerpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pafutemolawevobolunujurav.pdf In PDF document text
    • http://trans-serwis.com/userfiles/file/bezipuwivopesik.pdfIn PDF document text
    • https://bselink.com/userfiles/file/rulonubojikerazojiz.pdfIn PDF document text
    • https://247christianity.org/fckeditor/userfiles/file/visosivajuwozapogatewonem1624798353.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ace2ac4b06b---95078990098.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/af0b1fb7e68137fd5e8c408b32592e85/dikesiko.pdfIn PDF document text
    • https://hospvetcentral.pt/site/upload/file/nanugopefeb.pdfIn PDF document text
    • http://bigbazar.cz/is/images/FCKeditor/File/73474587384.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/364f8f4274739cacfd98e0436833eaa3/69984967988.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///pisut.pdfIn PDF document text
    • http://bulmarconsult.com/files/51676793268.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/73ad4ebd8aba11032f528a12b172215b/84268992717.pdfIn PDF document text
    • http://casaatlantida.com/userfiles/file///xiwovirowuta.pdfIn PDF document text
    • http://acelybio.com/upload/files/rejademelinovezote.pdfIn PDF document text
    • http://rilta.net/userfiles/files/28199490076.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609f52e37627e---80162981726.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1609099f8a176d---sabadezam.pdfIn PDF document text
    • http://chineseclothingonline.net/File/tojib.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ed28d27529486f04e2cd976bbfdf7209/xokepolifakorotixole.pdfIn PDF document text
    • http://elfobchod.cz/foto/Image/file/71688659219.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/woxatutur.pdfIn PDF document text
    • http://www.ville-dammarie.com/ckfinder/userfiles/files/93385764895.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/daa00a36a5a012d156b43cd93e702e66/dedoba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=ancestral+quest+15+user+manualPDF 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_off0000d64f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD64F 10592 bytes
SHA-256: b455301af206e91e6776aaaea7489993ac355d524c7b3a66acf88577d432c8c3
font_01_sfnt_off0000eeab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000106bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106BD 17272 bytes
SHA-256: e7ecddc3fdc87873f7ef99738960760ae6bb8b0634518b31fde872c46ef8671c

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