Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0f40de840676db8…

MALICIOUS

PDF

90.5 KB Created: 2021-08-04 06:57:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 368a7b7fc803cfdc934cff78df821154 SHA-1: 70a78ea66d7fe0469d4f6a04e42c54f4205abd18 SHA-256: b0f40de840676db8025dafa090d845cdace98ad3da4d4e1d56d2578444d28b21
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to websites that appear to be compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and does not provide clear textual lures, but the presence of link farms on compromised sites is a strong indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 http://gruaszarate.com/ckfinder/userfiles/files/21357946355.pdf In PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160999ff90b883---ketija.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/559518f7a820d0ed1bf5ce7d4155b6e5/betin.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/f46b728ecc71425a56661b328da8c978/60768789237.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f5daa864011---17779293711.pdfIn PDF document text
    • http://xn--m1age8bh.xn--p1ai/files/file/mimulasagivulelejopi.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/9c2cf96b5d074dfa87fbc7294f66da76/314210547.pdfIn PDF document text
    • http://tunglamgarden.com/images/fck/file/vijivobozatifuwadikeful.pdfIn PDF document text
    • http://malverne69.com/clients/a/a7/a743c233813d1a1dbf5c38c484d85cdc/File/13860620918.pdfIn PDF document text
    • http://congtyvima.com/images/Download/gavupezilejidopo.pdfIn PDF document text
    • http://gleneaglehoa.org/images/file/75893181069.pdfIn PDF document text
    • http://de-ko-gmbh.com/ckfinder/userfiles/files/79326237117.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/8e90da4d70a7a93bee7618a4600959dc/78558027316.pdfIn PDF document text
    • http://bon-mar.com/fck_user_files/file/78209662400.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/dff8c67fff7bebba93756a41d97c16ce/mizetixamotisujugexo.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8de15cde8d---62216072753.pdfIn PDF document text
    • http://lhsclassof68.com/clients/73441/File/4278886390.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/devujisakoxitoxefava.pdfIn PDF document text
    • http://mvclassof1990.com/clients/8/8c/8ca0ba2c7a07c5cd1f21f9fc323c16c5/File/pilopif.pdfIn PDF document text
    • http://hamdard.com/hamdard/app/webroot/img/ckfinder/userfiles/files/70301791631.pdfIn PDF document text
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/185392eb77d0a7b805b1439a5fb1e603/63593706239.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160750c77023e3---64567770033.pdfIn PDF document text
    • https://presentkompaniet.com/img/content/file/mebubojurijijotomewapulu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=fundamentals+of+financial+management+concise+10th+edition+cheggPDF 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_off0000fd2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD2D 11076 bytes
SHA-256: 8256b209e97e456f9ad55caa6a38cd0ade312de880daee7349b96ee53d140824
font_01_sfnt_off0001169a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1169A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012eac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EAC 17000 bytes
SHA-256: 2d65884016c7d647035f371ee0c84e2bdd48c0e64a6138d809e36cdb82d1fb9f

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