Malicious PDF — malware analysis report

Static analysis result for SHA-256 afc6ca15eb7da453…

MALICIOUS

PDF

71.5 KB Created: 2021-09-27 18:59:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: c8b0997a2598090c89db5ac38bfe03d2 SHA-1: bccad5d977b9fda16c36c01a60bdcc5385689ec9 SHA-256: afc6ca15eb7da453b98cfc352031fc6207923cae92e7e4eb12459fd7db711e34
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links pointing to compromised websites and disposable hosting, indicative of a link farm used for phishing or malware distribution. The presence of 'utm_term=run+apk+files+on+windows+10' in one URL suggests a lure related to running Android applications on Windows. Although no scripts were explicitly extracted, the PDF structure and URL patterns strongly suggest malicious intent, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://laborke.ru/uplcv?utm_term=run+apk+files+on+windows+10 PDF link annotation
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614bfcea4b967---metanevepenepo.pdfIn PDF document text
    • http://farashimirooz.com/files/xenobesabumilozemumipepen.pdfIn PDF document text
    • http://topspeed4wd.com/ckfinder/userfiles/files/dinumibonubademasisol.pdfIn PDF document text
    • http://droneducational.com/admin/userfiles/file/98099684902.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/toxukidunonakasolul.pdfIn PDF document text
    • http://myucpb.com/userfiles/file/94496346213.pdfIn PDF document text
    • http://gourmethousemacau.com/UploadFilesfile///35659628318.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/baf9db05fd24c863f86f327706edb76d/47664390759.pdfIn PDF document text
    • http://auto4-spb.ru/public/images/ckfinder/files/67827958333.pdfIn PDF document text
    • http://mislenyiallatorvos.hu/userfiles/file/xusisawonexugo.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/pipuwefozufovibigifa.pdfIn PDF document text
    • http://hanboo.cn/Uploads/file/2021092414221370554.pdfIn PDF document text
    • https://elmawadah.com/userfiles/file/63164734536.pdfIn PDF document text
    • http://npi-management.fr/ressource/site-image/files/87969626553.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/97379815889.pdfIn PDF document text
    • http://superlitefan.com/uploads/files/6639199956.pdfIn PDF document text
    • http://abwninemile.com/uploads/files/momowige.pdfIn PDF document text
    • http://degeninhotel.ru/admin/ckfinder/userfiles/files/govisexubugawufa.pdfIn PDF document text
    • http://dsfly.com/uploads/files/24599740486.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/44059976444.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/5d8b94a594c6d8b083b8b102f2a299fe/85854471444.pdfIn PDF document text
    • https://trungtammatnamviet.vn/upload/files/rujusebelokaw.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613de21c356c4---61230203675.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_off0000b1d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1D0 17740 bytes
SHA-256: 99c6bbd5396b3e78c546f2fc39ba0a19aecaab96efeb4825c4bb4288be1fd4b2
font_01_sfnt_off0000dfb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB5 10792 bytes
SHA-256: 057a54422f3383125c4b6025a4dc7dc934e6597b7494f546060f593abcb7733c
font_02_sfnt_off0000f8c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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