Malicious PDF — malware analysis report

Static analysis result for SHA-256 008f8d068b51918b…

MALICIOUS

PDF

86.4 KB Created: 2021-08-16 08:29:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 208f640a9405af838ddee5769d82a473 SHA-1: 08e3b3464d71313fb9d76fa9a399c0879f41586a SHA-256: 008f8d068b51918b8dce6bb6de178959b175fa4e16b7f76b717cf46ae6357be0
172 Risk Score

Malware Insights

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

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, presents a deceptive download button and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://cyc.cz/pictures/clanky/files/migugiv.pdf In PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/05c3554626af8b04ca53324903eeac87/28462421144.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/nibeduw.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/xedodepibiguvanupufeduji.pdfIn PDF document text
    • https://energiadirect.pl/application/resources/ckfinder/userfiles/files/28363243394.pdfIn PDF document text
    • http://gshosnab.ru/userfiles/file/38698990416.pdfIn PDF document text
    • https://nadinerogger.ch/userfiles/files/bilomorux.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/02fd4c8e5515309d27942886923b4a11/gazazanup.pdfIn PDF document text
    • http://www.cbs-emballages.com/upload/file/29711075733.pdfIn PDF document text
    • https://orangerun.re/photo/files/17531731791.pdfIn PDF document text
    • https://cafeau1ait.xyz/js/ckfinder/userfiles/files/goditejiv.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcb12c9c00c---waxedogafubokamoxuj.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d48fd42d013---20440984922.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607447dfd82ef---latavid.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/co2ae94or4le1v8ng9s17chjia/sivewipitunoguwifapido.pdfIn PDF document text
    • https://incoyun.com/calisma2/files/uploads/xikegopamavogefifazo.pdfIn PDF document text
    • http://ugrctrani.it/userfiles/files/dubuzogokiketorejexomejo.pdfIn PDF document text
    • https://tiklatakip.com/calisma2/files/uploads/sijiwejajijejubigoza.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/xupotajifuk.pdfIn PDF document text
    • https://moto-trend.cz/public/files/fck/file/76866117657.pdfIn PDF document text
    • http://chukguwang.com/files/fckeditor/file/gaduranofadadupekube.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=corrugated+steel+sheet+section+propertiesPDF 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_off0000ec1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC1B 10924 bytes
SHA-256: 413e896de93d7ef158914c97a922f44dbaaa1d71db418228975265547309c90b
font_01_sfnt_off00010527.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10527 17868 bytes
SHA-256: 679d43a9de9c5e15f9ac3c8447ec10de232c9b12e1ff389a29e0a06ca6347d43
font_02_sfnt_off00013408.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13408 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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