Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5c71e886b806492…

MALICIOUS

PDF

87.5 KB Created: 2021-07-08 01:07:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 0d854cd10b40ff7c56d610d3daffabb2 SHA-1: 94fbed506ceedaadaadec80e386600ba5c4b2e99 SHA-256: c5c71e886b80649222f438e01c464f9d3bf0ef7eedace6caeab2ee3016b2ba05
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous links to external websites, many of which appear to be hosted on compromised WordPress sites. The ML classifier and ClamAV both strongly indicate maliciousness, with ClamAV identifying it as Pdf.Phishing.Trojan. The presence of embedded URLs and the nature of the heuristics suggest this PDF is designed to redirect users to malicious content, likely for phishing or to download further malware. No scripts were extracted, but the PDF structure itself is indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://pistant.ru/uplcv?utm_term=smores+stoichiometry+lab+answers PDF link annotation
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160d61df34e40c---59361448066.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/davilebitipefu.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f535d69d79---ruwopezarakarajaradowef.pdfIn PDF document text
    • http://blissrenewbeauty.com/newerac2c/userfiles/file/savufilakifimuwolezamabi.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/6051d22da42207dec6f82af6926f0c94/zubajese.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c977aaa2988---zesikobujoxav.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/4736d5ad8c0eb8b44b68088113e3f00e/lapixorenogeloxanub.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/foromojotunerekep.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a71c12a443---30662613015.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/8ea297127a66225bc6104498a89dec5f/xerap.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/93752876327.pdfIn PDF document text
    • https://hogies.com/includes/template/uploads/file/kabotenumanaxinel.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/j7d163evd76520mgk66bvg2vcg/goximopijututo.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8dcda511f2---zurijidubewisuvo.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a95ebb0fdad---80957535201.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/84d5fac3bf6ff0764959a4b6df8efecd/welodinijakebofoja.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cee9c07bb32---27164492434.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/rg9mf1g00dng8k0f4lm68337u5/36897709431.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608032fc3bc72---89737679224.pdfIn PDF document text
    • http://lyshiying.com/d/files/funenuvudewojirokaza.pdfIn PDF document text
    • http://brooklinehs1964.com/clients/6/6a/6a3559cec3eb17f551da2d864c8c85ab/File/zuvotikixutumemok.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607bbfa7eb70d---tatuvizalaj.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/28808006621.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607e172b226c0---85551828480.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_off0000f412.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF412 16832 bytes
SHA-256: 64196881c0b4ef1220adf81f018f61e26e404889dc777500282f759268504049
font_01_sfnt_off00011fa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FA0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000137b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137B7 10912 bytes
SHA-256: 328011cba715685cbfb40cd1a9a92311cd424329c4e765013aad612b18e2ac77

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