Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd846dd94c5e9078…

MALICIOUS

PDF

75.3 KB Created: 2021-09-20 18:15:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 829ed1161ddd8059bf97fbabe14aa6ef SHA-1: 5379d120899205fb5bb01c81f4bb3aeaff6b4d53 SHA-256: cd846dd94c5e9078cc708420306c942d6010b41937330bf266ed3f182d61df68
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The file also exhibits characteristics of a link farm, with numerous URLs pointing to potentially compromised or disposable hosting, suggesting an attempt to obscure the final destination or distribute payloads. ClamAV detection and ML classification strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://crysiq.ru/uplcv?utm_term=harold+%26+kumar+go+to+white+castle PDF link annotation
    • http://ambiance-cinema.fr/wp-content/plugins/super-forms/uploads/php/files/a27a3d12c783307fabfdf9bee7e0fdac/xedusenirorufunaropeko.pdfIn PDF document text
    • http://swvocal.com/data/se2/file/busakiruxev.pdfIn PDF document text
    • https://xn--bren-mgenwil-gcbf.ch/sites/default/files/fck-uploads/file/tolixekugatureru.pdfIn PDF document text
    • http://www.yevres.fr/ckfinder/userfiles/files/kuvomevelelanuf.pdfIn PDF document text
    • http://preciz.com/uploads/wysiwyg/files/xuweziwafekiraf.pdfIn PDF document text
    • http://ondrejkocar.cz/img/file/42949162749.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/3087984b6fe5f004ed6406c7e5bf9eb9/76619708608.pdfIn PDF document text
    • http://spartapr.com/images/upload/file/suwesopixotofipizuw.pdfIn PDF document text
    • https://irantruck.ir/data/file/33495000466.pdfIn PDF document text
    • http://dhf-china.com/d/files/41915093244.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/37632b0e014da4b7dbee4582a94aedaa/34489862490.pdfIn PDF document text
    • http://apothepharma.com/upload/files/lozega.pdfIn PDF document text
    • https://gionggiacam.com/ckfinder/userfiles/files/kokowojotetevalibozu.pdfIn PDF document text
    • https://www.barefoothoa.com/webroot/js/ckfinder/userfiles/files/xebafamexakudafekexinu.pdfIn PDF document text
    • http://onmamtour.com/FileData/ckfinder/files/20210918_51DF043B1DCC21BE.pdfIn PDF document text
    • http://gongotour.com/FileData/ckfinder/files/20210907_465A54EDB353AC07.pdfIn PDF document text
    • http://kopdesign.nl/userfiles/file/68956268691.pdfIn PDF document text
    • https://gabinetpro.pl/kosmetyczka/krakow/files/mifojivilinuw.pdfIn PDF document text
    • https://clearpatth.com/userfiles/file/20020630698.pdfIn PDF document text
    • http://golfproradost.cz/webpagebuilder/ckfinder/userfiles/files/64044042335.pdfIn PDF document text
    • https://schachverein-marchhoefe.ch/fcsr/news/upload/file/20138852030.pdfIn PDF document text
    • http://villalapinetafavignana.it/userfiles/files/rekubikejigukuke.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16134cfd64bd0b---61222049009.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_off0000c7c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7C6 16676 bytes
SHA-256: 94ac0d971bd177a4d71783b0656062622df35f40ffdc71ff40694dcc245af101
font_01_sfnt_off0000f2f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B0B 9632 bytes
SHA-256: 2a4d8d8b45f9f74cb0dfdc4b44c3d2f564cda1cc321763ccc495ad0d8560e09c

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