Malicious PDF — malware analysis report

Static analysis result for SHA-256 9858edfa7a27fe41…

MALICIOUS

PDF

87.1 KB Created: 2021-06-27 05:26:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 34b78e98ec3670092be6e0925fbb15f6 SHA-1: 82bd110792192020f09773c14f634763c572cca7 SHA-256: 9858edfa7a27fe411586df77c254ada9f77abc4bc94b3b098f13d33fb8e4d03b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable hosting, suggesting it's used for phishing or distributing further malware. The presence of multiple external URIs and compromised CMS upload links strongly supports this attack pattern.

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://laborke.ru/uplcv?utm_term=water+insoluble+definition PDF link annotation
    • https://alrukn.co/userfiles/files/fajidobisosiledipiwak.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160bbbef02d065---38316392703.pdfIn PDF document text
    • http://happyhanool.com/ckupload/files/92423759982.pdfIn PDF document text
    • http://makesomenoise.hu/upload/file/maferolajavufuv.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/25sf8f1llfkkgtj4njua4jlc46/nutilomulubifi.pdfIn PDF document text
    • http://dichvugiayphep.biz/upload/ck/files/zixari.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/3cba6e2ecd6d094c05e0042ca550ac51/kusetowapogejozizutukefol.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0cc5c6825a---sevasigudifivegodomogun.pdfIn PDF document text
    • https://hiampelectric.com/wp-content/plugins/super-forms/uploads/php/files/a4a69c1c1541865560289f3a1049f1be/41602895140.pdfIn PDF document text
    • http://selfmadefilms.nl/userfiles/files/sufobevipodakudugonuloj.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/fewerikedotepifagug.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c53f8dc2193---79906970934.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160a358d4aaf76---benexaxufeg.pdfIn PDF document text
    • http://menloathertonhigh1980.com/clients/6/6f/6f83464fe0b13873896cace574d4baa5/File/37971331482.pdfIn PDF document text
    • http://argyler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa8400c296---59331424200.pdfIn PDF document text
    • http://cephedanismani.com/images/pages/file/koxomaxupubifosuluvow.pdfIn PDF document text
    • http://jrmhandling.nl/upload/file/zipujokodosupakanoparojir.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160bbb4a7a5dd1---bufosogalux.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/malebegatisiziruza.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607afad52b330---rogudom.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16093d132af9d4---43637707496.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/bb4p04sgg69sjmie49t3ieilbf/1338391854.pdfIn PDF document text
    • https://actorconseil.com/files/file/65507204527.pdfIn PDF document text
    • https://batikatravels.com/userfiles/file/sevunometebusexodezonijil.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_off0000f1aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000109c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109C1 10580 bytes
SHA-256: ff767565191a01baf420ca46ee312b0225e644d11dc6d1970c511e4f264942c2
font_02_sfnt_off000121f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121F9 17180 bytes
SHA-256: d3c0aced7ffc33990a2370ce9cfdcce74005df7ae7296181df9134411f9fadfb

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