Malicious PDF — malware analysis report

Static analysis result for SHA-256 393691f29a5d3c2e…

MALICIOUS

PDF

86.4 KB Created: 2021-09-03 05:08:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f8d8ec4209f337c4e75114a4a19755ff SHA-1: 1bbafddbe88193833ba39e6befe016ae77e1f9f5 SHA-256: 393691f29a5d3c2eda826e9b73e6db8e237d676ed8c4a31a0483cf4132a97eef
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised websites and disposable domains, indicating a link farm designed to distribute malicious content or phish users. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly support this assessment. The ML classifier and ClamAV detection further confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://oniceh.ru/uplcv?utm_term=lowrance+hook+5+fishfinder+manual PDF link annotation
    • http://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/31117049233.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/6422df5337bf7ea69f69f3104d9efefc/mokazawiborigimalusu.pdfIn PDF document text
    • https://pypconsultores.mx/userfiles/file/21003635665.pdfIn PDF document text
    • http://preciz.com/uploads/wysiwyg/files/40505145362.pdfIn PDF document text
    • http://magnachip.cn/userfiles/file/20210514071214.pdfIn PDF document text
    • https://lotteppta.com/beta/assets/file/8633863505.pdfIn PDF document text
    • http://staceyasp.com/UserFiles/file/rupagejomifa.pdfIn PDF document text
    • https://nexusmediation.nl/files/pidir.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/f5819177a513f82332a7878e2e21b06e/48963140810.pdfIn PDF document text
    • http://metabolitplus.ru/files/file/31104381477.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/6nvbb6vvgg3td8ott7r0v8s922/26209437219.pdfIn PDF document text
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/ae47b0eb0925416f37478bfbb3b0d895/40161168312.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160962670e1d2a---97368324867.pdfIn PDF document text
    • http://unitekinfostructures.com/userfiles/file/gabekukazixasagumom.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160968c479ade2---69518397351.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/72m2dkutjmc1hnq9cacr2odol6/rejujujomusas.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a9187275ec7---powerobofadatoginesig.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/17188033666.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608f2dab0da59---sozif.pdfIn PDF document text
    • https://vocembalo.ch/userfiles/file/xufiwajovolonupotapu.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/vobuzoxagewobeju.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/71047747809.pdfIn PDF document text
    • http://dansensvenner.dk/imagesfile///sijimibugedif.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/ua4iklu2hnre9lk2af55vlaj06/52292936330.pdfIn PDF document text
    • http://sskj.pl/userfiles/file/46298976890.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_off0000e9b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B6 11012 bytes
SHA-256: ea5e6c3cb0a1ae4dd7303c8405160372b550819a640854fdaebea5784ace05d2
font_01_sfnt_off00010333.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10333 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B45 19192 bytes
SHA-256: 87fa25bf17303a0f64f630313074b02702900710276d5a49a3988f8a96ca9312

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