Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcf56bba46c3be51…

MALICIOUS

PDF

88.9 KB Created: 2021-09-05 03:48:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a1035244179bb0c4e1b9ca3329ac2fa1 SHA-1: 6ab4b0ff771002aa0e9e9ea4c49e51f9bd2bd8e6 SHA-256: fcf56bba46c3be51025f6df1a40e9d15310713e32bd9245d96ad5b9d88f7356f
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection as 'Pdf.Phishing.Trojan' and the ML classifier's high score further support its malicious nature. No scripts were extracted, but the primary attack pattern involves directing users to external malicious 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://ketchas.ru/uplcv?utm_term=three+forms+of+verb+chart+pdf PDF link annotation
    • https://privatecambodiatour.com/userfiles/file/14890863817.pdfIn PDF document text
    • https://noticky.net/akce/fotky/file/fefemoluvaxuvawog.pdfIn PDF document text
    • https://bonekarusa.com/contents//files/81500115316.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160996ba5dc8d1---xujufonekabiwinitolonek.pdfIn PDF document text
    • http://cherishedmomentphotos.com/clients/8/84/84fe84b553acfcd191e166b7401b6f02/File/zosuleratasomixe.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/fevuguvisofaveluk.pdfIn PDF document text
    • http://www.radio-kum.si/data/files/xofukuxaxorimisuforogifon.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/l4o7dbf95gtsdm64dj0udqag3s/velijakowid.pdfIn PDF document text
    • http://svazekobciorlice.cz/userfiles/file/51066811286.pdfIn PDF document text
    • https://miet.hu/kepek/96584733696.pdfIn PDF document text
    • http://sellmysayarah.com/userfiles/files/lekejubebanunuwesux.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16098341abdddf---39508962947.pdfIn PDF document text
    • http://www.siscbolivia.com/admin/uploaded/fck/file/22105158848.pdfIn PDF document text
    • http://e-baze.lv/images/site/file/rofesovovelijit.pdfIn PDF document text
    • http://www.valaisconsulting.ch/file/zilajilatiwugefotedibi.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/u5haqd7toei9pcsrs2l3ejv8ka/48286013916.pdfIn PDF document text
    • http://kyanite.tv/userfiles/file/sobovi.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/85f491382dfde377c4ba96a355cf2e0a/wigiduvupokeguzutarawipim.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073686611093---30202923052.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/cad964ae40af1c1f224cae179b701d22/53251191289.pdfIn PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/35be5d66fc2e3ff1c3dd0761317e5671/dabibijopolovapewovimogud.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/2a4fb6f822c5010165785a6121e4482a/befozutojerajumeba.pdfIn PDF document text
    • http://ubytovna-krumlov.cz/userfiles/file/fogiriluxedil.pdfIn PDF document text
    • http://dongphat.net/upload/files/41521686676.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/5483216219.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_off0000e540.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE540 17332 bytes
SHA-256: 731a45fd04b121e9cf85fc7b99db2e32d2799cd1e517cefe5cbb2210f9346ce8
font_01_sfnt_off000111e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111E1 17184 bytes
SHA-256: b4805ad42ac573ca40f4e16c24e5d971d8fede29c0f03744a012a1f383575f86
font_02_sfnt_off00013e16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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