Malicious PDF — malware analysis report

Static analysis result for SHA-256 6af2cadbe04e677c…

MALICIOUS

PDF

82.1 KB Created: 2021-09-09 01:30:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a9d9eac316ae90c1e2b7bc65d4f37903 SHA-1: 0416d0ad882563a2ca84a42d84e10cd7b291d32f SHA-256: 6af2cadbe04e677c5d101641d72c620166699c45ba6a2228ee35cacf6323f386
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8014

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://eternoohydro.com/d/files/wikomewibivelufu.pdf In PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613351ff8e073---voxagipetugomot.pdfIn PDF document text
    • https://sofahatinh.com/upload/files/ritupeto.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/161351a02dca9a---ribijatu.pdfIn PDF document text
    • http://ozona.pt/js/fckeditor/editor/filemanager/connectors/wysiwygfiles/file/rejud.pdfIn PDF document text
    • http://kerekagy.hu/UserFiles/file/48750628384.pdfIn PDF document text
    • http://kiko168.com/UploadFile/file/20210901142437527.pdfIn PDF document text
    • https://kimcert.com/E/file/49277062863.pdfIn PDF document text
    • http://petswithlove.com/cvsprojects/SSK/Source/2.0.0/images/files/lekida.pdfIn PDF document text
    • https://investincarpathians.eu/app/webroot/media/files/vuzinifomo.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/guvukad.pdfIn PDF document text
    • http://valkexclusief.reviews/app/webroot/files/userfiles/files/sujemafoxaxe.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/66088208930.pdfIn PDF document text
    • http://smartickgroup.com/userfiles/54423339981.pdfIn PDF document text
    • http://tingchucontrol.com/Uploadfiles/files/sowolefetaleluwavamepe.pdfIn PDF document text
    • https://jhservice.net/imagenes/galeria/files/litetivopukujovate.pdfIn PDF document text
    • https://dtd.com.pk/ckfinder/userfiles/files/12004132745.pdfIn PDF document text
    • http://tuhocxuatnhapkhau.com/uploads/ckfinder/files/nanedaka.pdfIn PDF document text
    • http://klhl.com/userfiles/file/fezojosusalikagividus.pdfIn PDF document text
    • https://a-pointpro.com/cms/ckfinder/userfiles/files/towekijevupekipavupeg.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135d73391c6f---17583221209.pdfIn PDF document text
    • https://delta-relay.be/userfiles/file/52587878873.pdfIn PDF document text
    • http://findmecakes.com/userfiles/files/13868068804.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=cashzine+buzz+apkPDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/xazofekafifurilixoro.pdfIn 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_off0000d70c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD70C 10408 bytes
SHA-256: 9ccf4e460f3be55ec7f0264f2789880dc6761b9c32cf48e16bb18da5a9ec9d08
font_01_sfnt_off0000ee59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE59 22796 bytes
SHA-256: 8b1e701f84dd1386512978f173f2664dc5020ac1f92e8610a906d56347cc5cc9
font_02_sfnt_off00012a8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A8F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1