Malicious PDF — malware analysis report

Static analysis result for SHA-256 104d27205223b22f…

MALICIOUS

PDF

76.5 KB Created: 2021-09-07 11:43:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 83e2d217c025e4067e2e4460554e9ad5 SHA-1: b737af49cf6439d4f182f5a49fea5011814011f9 SHA-256: 104d27205223b22f02ecd161d7db557c1365f74059012fe12c39e544cab4a8c8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites. The numerous external links, many pointing to compromised WordPress sites or disposable hosting, strongly suggest a phishing or malware distribution campaign. The ML classifier and ClamAV detection further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://gd-weimi.com/upfolder/e/files/20210907062529.pdf In PDF document text
    • http://e-baze.lv/images/site/file/fipodiron.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/mrjnqkujga44g5ivv6ejspsqs6/midubux.pdfIn PDF document text
    • http://doubletroubels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160786df4d9e48---90505004563.pdfIn PDF document text
    • http://coimbrasoftware.hu/images/uploads/files/zumij.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/negabofovuxit.pdfIn PDF document text
    • http://redtopmarina.com/clients/7/72/7297c65379f6126c97b8b18e62fd1dd4/File/69053003821.pdfIn PDF document text
    • https://cuacuonbentre.com/upload/files/7823646734.pdfIn PDF document text
    • https://cdpu.net/wp-content/plugins/super-forms/uploads/php/files/23505b0315c5b471ba36d82dba116242/29794837625.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/8488946097.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/ruvesebapamub.pdfIn PDF document text
    • https://hiddencliff.kr/FileData/ckfinder/files/20210621_7C7AF4A50F1D5B65.pdfIn PDF document text
    • https://www.tanyadantus.com/wp-content/plugins/super-forms/uploads/php/files/e8caa63c4964abaa0b4cf8ccc0915d2f/23500580771.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/1uqike84ru62rdie02emof5jdr/xonanajesomowapil.pdfIn PDF document text
    • https://rsvforum.com/userfiles/file/wevizenateru.pdfIn PDF document text
    • http://doubles301.jp/files/ckeditor/files/jupegidanovi.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a02d7f5d7ba---76784590173.pdfIn PDF document text
    • http://ventiliatoriai.lt/js/ckfinder/userfiles/files/82178324745.pdfIn PDF document text
    • http://bbfederico2.net/userfiles/file/93153988240.pdfIn PDF document text
    • https://www.deuba.info/wp-content/plugins/super-forms/uploads/php/files/s6rj9g5gfej9cpsqju8e5qt7s7/gigafir.pdfIn PDF document text
    • http://zulassungsservice4you.de/bilder/file/barunif.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba57a2a8a4---56419933248.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/pesuvogusuj.pdfIn PDF document text
    • https://botorka.ro/userfiles/file/15015452284.pdfIn PDF document text
    • http://ciaooo.ru/uploades/userfiles/file/japosumu.pdfIn PDF document text
    • http://wtmongolia.com/materials/file/55496723673.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c88083237db---17063243004.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=spelling+test+pdfPDF 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_off0000c796.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC796 17860 bytes
SHA-256: c0d88f746600a53c9b660359bee11341a0e8a3f25b31f266b4d797601f1baff3
font_01_sfnt_off0000f521.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF521 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D38 10364 bytes
SHA-256: 08175ff0eb42a199753684382d209d56499aa06a268d4bf6157f19cf30f347db

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