Malicious PDF — malware analysis report

Static analysis result for SHA-256 db76b9fc07605502…

MALICIOUS

PDF

98.6 KB Created: 2021-08-09 09:23:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b24811e25d774181a1ef45d1ae7226e4 SHA-1: f13b2b335112b82cf60abcb50e7ecf056c04dd3e SHA-256: db76b9fc076055029d4fe857169e7898e8008db1f000d6ffb9128d75059d728d
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating it is likely a phishing trojan. It functions as a link farm, containing numerous URLs that point to various websites, some of which are hosted on compromised CMS uploads. The primary attack pattern involves luring users to click on these links, potentially leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9889

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://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/319f814b26ee419c4ea526895d11e6f8/40113451270.pdf In PDF document text
    • http://tele-video.ru/upload/files/dolixegejuj.pdfIn PDF document text
    • http://kahounova.cz/userfiles/file/sagutitixefulezesowuto.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/d7f40cbb857d102482b5ed5068987318/rufebiguwu.pdfIn PDF document text
    • http://annassteen.com/ckfinder/userfiles/files/midibolezana.pdfIn PDF document text
    • https://dakhoathienhoa.net/images/files/dafexowutipol.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/lifajejuvomavojugazakux.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/66c72ad00492690e191ffbab77dbc78b/dujukapamozolav.pdfIn PDF document text
    • http://1544-7419.net/upload/fckeditor/file/8814850671.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b3ba422b8---wekad.pdfIn PDF document text
    • http://healthywithhart.com/res/file/24993024084.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16084b63889ca5---fosobigoxi.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16107e9ecc9809---bezazuxilawepufut.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles//file/lisopilu.pdfIn PDF document text
    • http://lightningriskassessment.com/ci/userfiles/files/23076316687.pdfIn PDF document text
    • http://abwingssuffolk2.com/uploads/files/jarufozoxonukepeb.pdfIn PDF document text
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/78929604887.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/21266295266.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f72e4d99e1---74988203589.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9f63eef64---73028283575.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16087bc7578c32---tagutedibirurezalow.pdfIn PDF document text
    • https://parfumzone.ro/files/file/76443271683.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160748294350bb---komafax.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608f55d843273---85128629308.pdfIn PDF document text
    • https://mujeresenmovimientoplus.com/userfiles/file/fibovizo.pdfIn PDF document text
    • http://ambvet-trefontane.eu/userfiles/files/kewaviduvanubelelugigo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=free+piano+sheet+music+for+contemporary+christian+songsPDF 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_off00011941.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11941 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013153.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13153 17568 bytes
SHA-256: d11bc134ef230636141487576fe9706cbac74d7ff6653d0da7a78d1a8d7e0832
font_02_sfnt_off00015f45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F45 11072 bytes
SHA-256: 3f06240b2960f44ba0e5ca16700b1602ba0c211c034394f4d8da868d0a72d01a

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