Malicious PDF — malware analysis report

Static analysis result for SHA-256 78eeee8cb0603ab5…

MALICIOUS

PDF

95.3 KB Created: 2021-07-16 22:45:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5fc9b90fd92758c53efa17517b9d2051 SHA-1: 7437c6d2dc97244f7fc9f9ac335a705d97f99318 SHA-256: 78eeee8cb0603ab58b3972fed7a6864dad5b7c924b5641b054e0971f7a171f07
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload storage and disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, and the document body was unreadable binary data, so the rationale is based on the URL analysis and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9786

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 http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/et9loq0u6e3og69ah77g41k490/firosuturoxuxufenadirek.pdf In PDF document text
    • http://www.pranabkumar.com/fckimages/file/88750974.pdfIn PDF document text
    • http://bpabv.nl/uploadfiles/file/pujavezeveluxenamukel.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/kesatipesafagujatadagakor.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160898db5d2bbd---nudebodina.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/45401616999.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce3cc5c5147---62665059873.pdfIn PDF document text
    • http://lorichphoto.com/pictures/file/85704322556.pdfIn PDF document text
    • http://orourkelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nawuxituverupiw.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6eb036cb04---zekokizegirupotapufoxuwi.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a4a29749261---bopubajigawiguwimoka.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/it796ei5anb0j7ggfukqbbk8r7/75046775176.pdfIn PDF document text
    • http://wumag.pl/userfiles/file/45462754441.pdfIn PDF document text
    • http://homelife-superstars.com/image/files/84264359290.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/329231225618b9059bc527535c7fde6d/jigerozan.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160850e32c080e---gasepodegi.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b29a5fb8238---97665038729.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/a2c74jq57bjlan2e1u25dbmo30/64985009942.pdfIn PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/jinodo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f518cd4da2---8628423735.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160e8b32c7e9e1---dizukavapurazodaz.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/51474369367d393317ab22d19d90f981/50113794643.pdfIn PDF document text
    • http://uceng.net/_UploadFile/Images/file/gurafejenireworubagoj.pdfIn PDF document text
    • http://washchienluoc.com/upload/file/rasaxidesuvatov.pdfIn PDF document text
    • http://dh-life.com/ckfinder/userfiles/files/nemijetazejofotaritusagax.pdfIn PDF document text
    • http://shuimotongyuan.com/userfiles/file/3135600375.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=wide+span+building+archdailyPDF link annotation
    • 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_off000103a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A2 18696 bytes
SHA-256: 05b7c09f53dbd0bc082b890abf9e7f7195618e16506952840dcd81836649928f
font_01_sfnt_off00013419.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13419 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014c30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C30 10924 bytes
SHA-256: cfb4555e1e9294a5e6a818cc6a88217743bd6a65799d212143130ebe14250abf
font_03_sfnt_off000164ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x164EE 1908 bytes
SHA-256: 9cc33896158827740cddab3ccf53e01baf50e4f009672209e3d6558c91960c98

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