Malicious PDF — malware analysis report

Static analysis result for SHA-256 36f00d1b81fae84e…

MALICIOUS

PDF

79.5 KB Created: 2021-09-02 13:58:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fcaa9082d9a1fb42feef6b41b42ade31 SHA-1: 45996b40b13ef8385021d417aa96c1824601cb7e SHA-256: 36f00d1b81fae84e81615da12d04341061171dbf93558e9b9e0db09051f876c8
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm or phishing lure. The PDF structure and the presence of multiple external links point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9780

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://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608865f26c0bb---pasedaxoruziratapi.pdf In PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/95acd16c9579540e38cb6e25830a60e6/tibugipififatalomejuwex.pdfIn PDF document text
    • https://marigabung.com/contents/files/jupapegijibidovojidi.pdfIn PDF document text
    • http://geose.ru/userfiles/file/57078833537.pdfIn PDF document text
    • http://soldearenales.com/galeria/files/57122957813.pdfIn PDF document text
    • http://boilerservis.ru/uploads/files/98906552534.pdfIn PDF document text
    • https://oumkua.com/userfiles/file/21942237665.pdfIn PDF document text
    • http://paliukenas.lt/i/File/bebezedugasasu.pdfIn PDF document text
    • https://jxloanchien.com/style/postimage/file/xubalirebef.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/60855757936.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1c9038ef9---53794824688.pdfIn PDF document text
    • https://immobiliareincentro.it/allegati/file/selabamemuzunegunaxogas.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a88fc439120---kuzefoxoxe.pdfIn PDF document text
    • https://yellowstonewildlife.com/zevememofarezumipusa.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610e7b2a47171---buzadibufakubemulotun.pdfIn PDF document text
    • https://its-bulgaria.bg/files/file/73879705433.pdfIn PDF document text
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/99922715153.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b149b590f12---72989467856.pdfIn PDF document text
    • https://jordan.si/dokumenti/file/76568796384.pdfIn PDF document text
    • https://chpcentre.com/files/file/54691604826.pdfIn PDF document text
    • http://smenergy.kr/uploaded/file/72560970061048a3b9678d.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a22cdab8bb9---6578396188.pdfIn PDF document text
    • http://thienlongadv.com/upload/files/wapesoseboto.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/de58deb5cb2dac3d791c50592f988945/tililipaxisamega.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608b5f09b3cf3---ximisasudusi.pdfIn PDF document text
    • http://alt-1c.ru/userfiles/file/37525590390.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=my2n+omron+relay+ac+dc+pdfPDF 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_off0000c177.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC177 20812 bytes
SHA-256: 027192745c5fc99ab46c99b03d0077c44ca2e1b7e21b0f90fdb7ec90e184d501
font_01_sfnt_off0000f577.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF577 10652 bytes
SHA-256: 222ae6a7b6a640c2e711df3977d60fb41d74d92e87c0fc313eb93a9c8a853097
font_02_sfnt_off00010de3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000125f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125F0 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc

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