Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ddf7ce6cdfbce2a…

MALICIOUS

PDF

92.1 KB Created: 2021-06-26 09:52:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: abae9636d6720b6ba04dd4ad0857e7d3 SHA-1: 76cef45dc6ea5654752b01080572e6c373ffaa85 SHA-256: 2ddf7ce6cdfbce2a3dd7d9214ed6d0745d7e167311b1c8e224e453d9e6cddd7e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with multiple heuristics indicating it functions as a link farm pointing to compromised WordPress upload storage. The embedded URLs, such as 'https://inwebjor.ru/uplcv?utm_term=untitled+goose+guide', are likely used to redirect users to phishing or malware distribution sites. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest an attempt to exploit users through deceptive links.

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://inwebjor.ru/uplcv?utm_term=untitled+goose+guide
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607bbc0fa0ef9---ledudazulizaba.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4cb0c3bf2---39819391014.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16073b8360a0c5---karemutej.pdf
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c897cbd9a6f---subekirolavedinawomox.pdf
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5f1c7d3a4---30311880276.pdf
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/538ahpid6gsa5brgc8nhb1dcek/leripotajusasiwefutuf.pdf
    • http://nakamurasangyou.jp/app/webroot/uploads/files/17391703865.pdf
    • http://ligneus.hu/upload/file/82067010683.pdf
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/748d7057d2ced31245df74628e1ca47a/28646681357.pdf
    • http://sl-light.ru/design/img/upload/file/57436407100.pdf
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba97f622f5---bikidatoreletel.pdf
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/379pcqfhlllo1oegnkkhmegntp/74282981543.pdf
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/0eae082f9796b5aaef4cbbad207e70a5/zesoxeritokopukefonupe.pdf
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/223848b268e035e7a366c32bd8401a51/zexoga.pdf
    • http://homeopathyhongkong.cn/files/21967157572.pdf
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a288e151750---jetazefa.pdf
    • https://fleschimmo.lu/userfiles/files/zobesudurodarurigisoladi.pdf
    • http://metapolar.hu/tmp/pibezataxazagogesakibir.pdf
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/da75e1068c1ffe24a046751f3a6facb5/kawapoxagetaz.pdf
    • http://rkmaster.ru/uploads/files/22387876942.pdf
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/56459e0e8799e84d8d02724e887c14ff/90332370580.pdf
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b42c57bea98---zidurodosolafusojoxuzeti.pdf
    • http://winterwonderlandzundert.nl/uploadimages/files/faberatunisovi.pdf
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d10f2ad592---fabat.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd0c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD0C 16792 bytes
font_01_sfnt_off0001151e.bin
5bd3805570f71e7d2d327b01dac1e36dfbb502f170d542cbc0f738814745a740		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1151E 21852 bytes
font_02_sfnt_off00014c3f.bin
9924294a8494032997afbb72abfafe025cc57a7b189dce9aca5c8f1c4b0bf501		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14C3F 10268 bytes

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