Malicious PDF — malware analysis report

Static analysis result for SHA-256 a99b4c2dc5bc71b6…

MALICIOUS

PDF

101.0 KB Created: 2021-07-01 23:13:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 20e560ee86bdcc9c37ee0b823df488df SHA-1: 82e835bbc54c7f6ae59e798d7266a9b4d4d5ac25 SHA-256: a99b4c2dc5bc71b6c90f03c36e19cfa1b527e303a9f09cbafcc486ca9f8b4b1c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised websites and disposable hosting, indicative of a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are consistent with techniques used to deliver malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://coretry.ru/uplcv?utm_term=felicity+huffman+sons+of+anarchy PDF link annotation
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/942e8fd95851dcc5985da659328dba2a/foviwe.pdfIn PDF document text
    • https://nnt52.ru/userfiles/file/22703381565.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160852faa55677---dixediletukogasonatenaja.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/35122672043.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606d13b5ba852---pavitok.pdfIn PDF document text
    • https://saunadlaciebie.pl/userfiles/file/35932503646.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609a2ec43bec4---wurebamekojam.pdfIn PDF document text
    • https://xosobacninh.vn/webroot/img/files/velegukoropabijasufel.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609cbdf2dd16d---43805077969.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/79925475747.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608aebd42fa5b---58791977184.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/palamalixujamulenazebiped.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160aef3adf09ca---18959584644.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/afed5e1fbfb16463bced51db848b6227/juzulerupivajegotodum.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/3792f13eslektd3kq102924bf8/lenuvur.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///guzonifonedalosu.pdfIn PDF document text
    • https://murtenhof.ch/userfiles/files/pitasevikeronu.pdfIn PDF document text
    • http://abpaluso.com/upload/file/25975691873.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a294719b4cd---mufekitoxivozegij.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/affe90e3cc41c451e244bdb2c144772f/repebuse.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6ae1960dab---51578987334.pdfIn PDF document text
    • http://wang023spa.com/userfiles/202106file/2021061213460970554.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_off000126c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126C0 18032 bytes
SHA-256: bc5fd37430c903b52ec02119c6736361cde8b517677888696521cfd5ed906491
font_01_sfnt_off00015651.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15651 10792 bytes
SHA-256: 32711a1a39664ea04d5a94f12d88fc5e4c8a9b236ce4aa237155ae43cfc8135e
font_02_sfnt_off00016f03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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