Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec6e3dbe8c08506f…

MALICIOUS

PDF

87.4 KB Created: 2021-09-19 20:47:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d65d33a551ebfb5b0171f3e0fa2d0f83 SHA-1: 21f09e1c78cf60b8f6830a716db6044236d2e58b SHA-256: ec6e3dbe8c08506fa73dc3af6a2400d09b74b54bb6819ca50b9a35521ba2cf82
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs that point to potentially compromised websites or disposable hosting, suggesting it's used to distribute phishing content or further malware. The presence of embedded URLs and the nature of the heuristics strongly suggest this PDF is part of a phishing campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://nomylo.ru/uplcv?utm_term=how+to+send+a+video+on+an+android+phone PDF link annotation
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133d4b27e3ab---74454664715.pdfIn PDF document text
    • https://g4m3s-4p1-12s1.com/contents/files/66755903683.pdfIn PDF document text
    • https://eurochen.com/UpFiles/WebEditorFiles/file/75314795656.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/c94120cfbea482e5340fb740c575a115/pivejarutob.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/871b1c73b7ce4e9329aa670340e70000/67626364969.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/65965291547.pdfIn PDF document text
    • http://rajasthanmetals.com/userfiles/file/warominopapanizuvaz.pdfIn PDF document text
    • https://eltonltd.ru/sites/default/files/uploads/28984211782.pdfIn PDF document text
    • http://touchpanelpro.com/upload/files/72213704052.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/95142645462.pdfIn PDF document text
    • http://traktorpulling.de/ablage/userfiles/files/1142129341.pdfIn PDF document text
    • http://zaiger.ru/img/file/gapomelolovagun.pdfIn PDF document text
    • http://topliving.sk/userfiles/file/61007661803.pdfIn PDF document text
    • http://chinatriage.com/ckfinder/userfiles/files/vedasimufales.pdfIn PDF document text
    • http://hosungtour.net/FileData/ckfinder/files/20210904_494311BE277067D4.pdfIn PDF document text
    • https://behagi.eus/files/galeria/files/852185492.pdfIn PDF document text
    • http://istanbulballoons.com/ckfinder/userfiles/files/kunof.pdfIn PDF document text
    • http://elateridae.com/images/FCKeditor/file/vikufipakulororuzusesi.pdfIn PDF document text
    • http://missteenqueenuk.com/userfiles/file/sotebajedefodejumosazip.pdfIn PDF document text
    • https://xrtradingfeedback.com/cmsimages/file/59812366216.pdfIn PDF document text
    • http://zhizhencn.com/filespath/files/20210910042506.pdfIn PDF document text
    • http://phuclocvienjsc.com/uploads/image/files/luvosuvonalusabuxifuva.pdfIn PDF document text
    • http://www.srijonihealinghome.com/fckimages/file/23888015707.pdfIn PDF document text
    • http://mrybalko.ru/files/bexegunejufuledavi.pdfIn PDF document text
    • http://ilsungwarehouse.com/userData/ebizro_board/file/nusapawemigubiwunuguzew.pdfIn PDF document text
    • http://wmsone.com/eimages/file/4561613040.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_off0000efed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFED 10588 bytes
SHA-256: 8d7a8124716aef9b9f50513e001e5286ab23fcbd600b070dfdc99a5f31cf6d21
font_01_sfnt_off00010812.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10812 18240 bytes
SHA-256: 168a359aa9afb5797aed475ec3060bee22498165e9a8c23cb6a11034d0c1069d
font_02_sfnt_off0001377c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1377C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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