Malicious PDF — malware analysis report

Static analysis result for SHA-256 47b00feef5de813f…

MALICIOUS

PDF

89.0 KB Created: 2021-09-09 00:49:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: eeb7c9a724f7fdd6bd28380df0d62522 SHA-1: b61a5f748d3aa4b37412f60405c12000293b0e42 SHA-256: 47b00feef5de813fa6b7aedf9abacc016e3a096130d0cdad40480e68cb77a541
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that function as a link farm, directing users to various PDF files hosted on potentially compromised or disposable domains. The presence of 'utm_term' parameters suggests a phishing or SEO-based distribution strategy, aiming to trick users into downloading files under the guise of legitimate software or content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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://synerhu.ru/uplcv?utm_term=download+infinite+flight+simulator+pro
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/161341b0809dd8---towinurotanatano.pdf
    • https://trieurodata.ro/images/file/84245512918.pdf
    • https://kalyna.ua/sites/default/files/userfiles/file/sujitojawidunuze.pdf
    • http://inggeo.eu/userfiles/files/povuwamaduluwavajobikep.pdf
    • https://bokaichenyu.com/upload/files/89541896169.pdf
    • http://penzion-u-zamku.cz/files/file/dopivexuzoxof.pdf
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/64f42ba1a633cc77a55851898c17ccc4/95014318619.pdf
    • http://conganbacgiang.vn/app/webroot/uploads/files/vipivot.pdf
    • http://artwatch.ru/userfiles/file/mafukamegabimoxunon.pdf
    • http://workontext.ru/media/file/43529499710.pdf
    • http://wirtrauenuns.ch/images/file/bilebejujar.pdf
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec7ee23878---sagawisugarariduwoge.pdf
    • http://flamefitnessstudio.com/cewit/images/file/30050004099.pdf
    • http://damnoen.com/ckfinder/pho/files/tuzivazo.pdf
    • http://tinhdauvietnam.vn/upload/files/pazawajidudakufovanisasu.pdf
    • http://thanhcongtechtra.com/upload/files/30682574168.pdf
    • https://globalathena.com/ckfinder/userfiles/files/wejabip.pdf
    • http://emailreceptionist.net/userfiles/file/futolupamusir.pdf
    • https://sibconsulting.com/contents/files/dumetijitunivefut.pdf
    • http://cableesmaltado.com/d/files/58062394408.pdf
    • http://imobilestore.de/userfiles/file/35694285942.pdf
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/3f83c6a9caf61183d4e6528920f5363b/51442429227.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d94f.bin
0aee987aaa3aa2fe031ff1843a1cc001c8165ab81e14609b1ffe0c07b3f1971b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD94F 17736 bytes
font_01_sfnt_off0000f440.bin
e85e8f52e65b82d3aa5ce1d31c2f950a975fedb5a30d71c888b7fb9b71e1c8ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF440 11132 bytes
font_02_sfnt_off00010dd6.bin
16f36c190780ec9ff0bb0bb048bf4a2b56050ce115b8f9395b28bcbcf1339320		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD6 18312 bytes
font_03_sfnt_off00013dde.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13DDE 16792 bytes

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