Malicious PDF — malware analysis report

Static analysis result for SHA-256 6875fdd79ca6b6cd…

MALICIOUS

PDF

88.4 KB Created: 2021-09-24 10:55:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e0487a8170f0b709ab8e6e0fbfc960d4 SHA-1: a2f70b6332b87d7dfbb8f7feebf87f9208a049af SHA-256: 6875fdd79ca6b6cdc767004ee8fd7ce85d4ed97301925e63bcf71b854f887a91
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing pages or download further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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 https://medvor.ru/uplcv?utm_term=how+to+clean+up+internal+storage+on+android PDF link annotation
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131fe02a862c---rogirerosutuvefimazosej.pdfIn PDF document text
    • http://redigonda.it/userfiles/files/babiwuvuzaxisawigedum.pdfIn PDF document text
    • https://www.tulsarad.com/my_content/js/ckfinder/userfiles/files/zebodalunevonevafodibop.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/161361f6a82083---7927709513.pdfIn PDF document text
    • https://penmypoem.com/new/admin/uploadfiles/file/jidigapimediris.pdfIn PDF document text
    • http://bycongroup.com/UserFiles/file/runututog.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/16132ea4d627ba---26793442641.pdfIn PDF document text
    • http://status-go.net/gfx/userfiles/files/98979339777.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/gavuwotimejiwanis.pdfIn PDF document text
    • http://turchifiltri.com/userfiles/files/25265802884.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148e2211d39e---zemizujofukonusijibuli.pdfIn PDF document text
    • http://4bx.pl/public/file/10147170254.pdfIn PDF document text
    • http://halanmilk.com/upload/files/66057002333.pdfIn PDF document text
    • https://panificioilcavaliere.it/userfiles/files/28989905417.pdfIn PDF document text
    • http://www.la-rocca.pl/app/webroot/files/files/82061418426.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/64393634288.pdfIn PDF document text
    • https://rmduncanrealty.com/userfiles/files/vivofawezivubepexudajeti.pdfIn PDF document text
    • http://yesfabric.com/images/upload/File/65373838105.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/4bg99fee35atdsmehgnhaiv9n5/resuwuzo.pdfIn PDF document text
    • http://bon-mar.com/fck_user_files/file/67919100460.pdfIn PDF document text
    • https://vnmmalta.com/userfiles/file/10321937505.pdfIn PDF document text
    • http://boschvietnam.vn/files/usersfiles/files/fawulikunexe.pdfIn PDF document text
    • http://premiercontainerlines.com/media/ftp/file/tarivefamafomisege.pdfIn PDF document text
    • http://yourhealthyanswer.com/ckfinder/userfiles/files/wegutiludamiwuvosus.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/tudofa.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/72607950113.pdfIn PDF document text
    • http://missteenqueenuk.com/userfiles/file/54072523044.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_off0000ef45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF45 10868 bytes
SHA-256: 86d33341c951abc9ae45ae5807ef50ba28bf94271fa1510592ae29fda39c7cbb
font_01_sfnt_off0001084b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1084B 19900 bytes
SHA-256: f1f121d51ddc03bcdbd390869e408020011fcb6433c96af1790786bcdf73b50d
font_02_sfnt_off00013b15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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