Malicious PDF — malware analysis report

Static analysis result for SHA-256 37f328e55c50c156…

MALICIOUS

PDF

75.3 KB Created: 2021-09-03 02:55:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 66535cf1128762efba13e422d4f266d2 SHA-1: 2e06ddd70f86795a66356066922b0416f57cd527 SHA-256: 37f328e55c50c15639c9c32126dfbb0169b79eeb2ce3dc2dd7eb37bfd92b0e6a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to various compromised WordPress sites and potentially malicious URLs. The presence of embedded URLs and the nature of the heuristics suggest this document is designed to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://synerhu.ru/uplcv?utm_term=exercices+sur+l%27appareil+digestif+pdf PDF link annotation
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160adca5f7cea2---xubosokenefebaru.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084a50439e59---navezosuvukevitavitodut.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/qt2bon3npspj2a9ec4m5882q32/79882323570.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607fafd535483---zovaxedawo.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/76005259015.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160818e06067ee---bejosofezuzajizidulit.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/be23e7d43366e57320dd0d500f32e39d/tekotuvavulujexepuwupez.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160916a3ec672f---sisojimavuvisojakopu.pdfIn PDF document text
    • http://hataylezzeti.com/resimler/files/jaxowepubopesivitad.pdfIn PDF document text
    • http://yachtandgulet.com/userfiles/file/banamakovuvegiru.pdfIn PDF document text
    • https://m-isc.com/userfiles/file/lipowelasofugavabigajidav.pdfIn PDF document text
    • http://pechati-piter.ru/userfiles/file/timapolovesas.pdfIn PDF document text
    • https://securitegenerale.tn/userfiles/file/jupawegekidefijaj.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df189e40dae---86749843766.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a982f2634e2---woxabiveri.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ecf8f8b2e5---ledagujizatowujagidoj.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e64d721c79f---71929148174.pdfIn PDF document text
    • https://almudenafernandez.co/ckfinder/userfiles/Files/97471851126.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb65a9d11a---87315763009.pdfIn PDF document text
    • https://tasleemdubai.com/userfiles/files/54724066002.pdfIn PDF document text
    • http://namuvaldymas.lt/userfiles/file/kedejutuwe.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/60738964593.pdfIn PDF document text
    • http://fteq.ru/files/file/28381509979.pdfIn PDF document text
    • http://live-lessons.net/lcj/web/uploads/assets/file/44605365777.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_off0000bed1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBED1 10792 bytes
SHA-256: 130a2d5bdc3aeef89c859be414f1e8b51c3f5e29843dc457c3e63faa072dc8ad
font_01_sfnt_off0000d7a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A7 18500 bytes
SHA-256: f948caf7203a43b1a32f5a64067e9ef5b752f821a49ad91dcfeea00fc1398b7e
font_02_sfnt_off00010708.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10708 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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