Malicious PDF — malware analysis report

Static analysis result for SHA-256 9525e64acf5ab5ee…

MALICIOUS

PDF

81.5 KB Created: 2021-08-20 10:26:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 836f075533fa430b049be29788f696c0 SHA-1: 5fc76c203a7143f1f2cb6bd32f91894876405312 SHA-256: 9525e64acf5ab5ee79568ff20c8bfbaf88a94518320b06954bb7f6f80836b996
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to various domains, many of which are hosted on compromised CMS platforms or appear to be link farms on disposable hosting. The primary function seems to be directing users to these external sites, likely for phishing or further malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://pixomot.ru/uplcv?utm_term=desarrollo+de+habilidades+directivas+david+a.+whetten+9+edicion+pdf PDF link annotation
    • http://vidol.nl/userfiles/file/29068766630.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/a06db264fd0b2a3f7562d261b34e2c3d/41790805083.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a75862b593---12200012496.pdfIn PDF document text
    • https://gretajensen.com/ckfinder/userfiles/files/wesulularisometu.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/2021052314064529387.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/ql2jfnkt3gle47iiprl7ik264k/85338933686.pdfIn PDF document text
    • https://soechi.net/userfiles/file/98720134004.pdfIn PDF document text
    • http://kapli74.ru/upload_picture/forumesinezaxivewuf.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/d827418adbd90a55b4a2f519dc19b47d/zawenixalakuw.pdfIn PDF document text
    • http://rheumatology.institute/upload/content/file/zositaziruzeg.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160845cebe29c8---noxeripimokozofedavuwuz.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/bec3fb9c873572a7fe93d50610e16c31/joguvotalonetunopawuzuno.pdfIn PDF document text
    • http://nhasachnguyenvancu.com/Images_upload/files/besuvedewejepokinulixited.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/gt5nnfvl970hug59lgs2vg62a4/koxipodebuwi.pdfIn PDF document text
    • http://primaria-ciocirlia.ro/media/file/60650742777.pdfIn PDF document text
    • http://www.fonfe.com/uploads/files/46279226646.pdfIn PDF document text
    • https://simondaulte.com/ckfinder/userfiles/files/93043668697.pdfIn PDF document text
    • http://inspiredindianfoundation.org/uploads/60079888908.pdfIn PDF document text
    • http://biancoacolori.it/userfiles/files/vewelofarupitajolef.pdfIn PDF document text
    • http://maekalocal.com/Maeka/UserFiles/File/49260419651.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d257fdceff---29116301268.pdfIn PDF document text
    • http://geyikkimya.com/userfiles/upload/file/posurapelarozemajefiwodem.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c4a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dcb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB3 16644 bytes
SHA-256: 12708592fe52c90690c7f5a9e76504829dfa4bd02f9eafe1a8147a0edcb064bd
font_02_sfnt_off000106a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106A0 11244 bytes
SHA-256: 06819945c5c614bba796713eede262b2f6c3b9f766b10a4ae4a6cd8f09ca772a
font_03_sfnt_off000120c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120C4 16140 bytes
SHA-256: 00b1f632e8afe72716c8bcdb76b7901b56c060d1dc0f96f3f5c1b8373b85735b

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