Malicious PDF — malware analysis report

Static analysis result for SHA-256 92b9717bea1e3b83…

MALICIOUS

PDF

133.3 KB Created: 2021-06-28 20:56:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b4555fa0e274711efc42e4a92d57b644 SHA-1: 38658a79534e35c9646036d3534f8fddea64e1b6 SHA-256: 92b9717bea1e3b8395de9c6ca4e7040453c0065f0d337fbbdd6c38a13152eed8
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct content clues, but the link farm structure is a clear indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9611

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://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/kpk732p4347fnp1a3eminf2on4/3390008434.pdf
    • http://mayinluatudong.com/uploads/userfiles/file/bibadejimunogivoref.pdf
    • http://bjeclinic.com/ckfinder/userfiles/files/lazubuwitoviremotifewe.pdf
    • https://quaint-house.com/29204517480.pdf
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/457eru0us06qjq8isp4eqpm4sc/xafuxa.pdf
    • http://griswoldremgmt.com/uploads/files/loziv.pdf
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095cd5b50b10---megivumopubowosifuwumadux.pdf
    • https://novahealthclinic.ca/userfiles/file/dofafekefunukorinaga.pdf
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16070fa4e73b2f---dalegat.pdf
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16087434ecf099---fufajosesagedexeru.pdf
    • https://eatorhours.org/e-bussiness/fckimages/file/38793445165.pdf
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1695b59002---xipumobifon.pdf
    • http://bamila.vn/luutru/files/3044362585.pdf
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d41cd5f209---tarapowikinumomabufises.pdf
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1606efa7b99ae7---88163190909.pdf
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bd74945d64---zefaropu.pdf
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/d07e02974d03546c66c2381197c1b9ea/xewuziladewizuleful.pdf
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/0424a401b0c9d96d15581f2f4315b3c8/65096236259.pdf
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608bd87d675aa---16008011892.pdf
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/15a1006528a79ec26c047f6d5921e699/zosefilibusidijaviwe.pdf
    • http://cableesmaltado.com/d/files/41480430703.pdf
    • http://agcslohian.com/userfiles/file/8302280835.pdf
    • http://iehyun.com/editorupload/file/dukovu.pdf
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16078fe79d0f9c---84789368417.pdf
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2165b87cc---ritoliziguvibal.pdf
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/1868f4c86631214d16005584c9239701/71377397905.pdf
    • https://ijpdua.com/contents//files/12993117876.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=bayes+theorem+in+business
    • https://www.thestreet.com/personal-finance/education/what-is-bayes-theorem-14797035
    • 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_off00019c60.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19C60 16792 bytes
font_01_sfnt_off0001b477.bin
0eeb35e051561baf00362ab4704632d25fd54e78b59bf6c815fea5ac18b0f098		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1B477 10736 bytes
font_02_sfnt_off0001cd03.bin
da7013aeaf25612f8afdc5cc9068312d5f09834da101382532b55a5a724f9e70		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1CD03 21952 bytes

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