Malicious PDF — malware analysis report

Static analysis result for SHA-256 77d77757ae31c5e7…

MALICIOUS

PDF

97.5 KB Created: 2021-06-25 13:09:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 718bea7e51038a6559e8d268865ebf1b SHA-1: c123bfa55866e36793fb260c61257a5a5168bc0f SHA-256: 77d77757ae31c5e73cff86b05a5dd374583fb37f0ddfdf342e614b2a0263509e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites, likely intended to redirect users to malicious content. The presence of multiple external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://wastran.ru/uplcv?utm_term=fire+enchantment+minecraft PDF link annotation
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a9be63dc71d---savaposelivirolobimaro.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/1f4188178841cd44599ba8179a260a28/surik.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/2ec32f0fd9a6ab751ce4aafe846bdafa/rukelowopesokalujibut.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/38603702009.pdfIn PDF document text
    • http://netmutum.com/userfiles/file/56314018142.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/47f96ceb87271dcbd960cd95020c4741/vaxavimoxot.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac83de4f502---noxoxofotuxutadoropis.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/7bf11e4b65110ac739e95d445d1fa019/64087932361.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a99a6b00a00---43459117451.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/22514978011.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16087ad6204850---nedaki.pdfIn PDF document text
    • http://www.onlinetemsilci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080a11cb2c8d---30648175896.pdfIn PDF document text
    • http://wisdomtours.net/upload/file/86046212590.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160be93fbae0fa---jufobonemoradifokikugo.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_off00011b88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001339a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1339A 17596 bytes
SHA-256: 31a187f5ee1013331fbb956e336321fbe438300d8861a0ca349e38418a85d3fa
font_02_sfnt_off0001614b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1614B 10244 bytes
SHA-256: f24e2a44b77f5e338a9666aead8268dc2196fd14491fbb1fa6fc85e3797300a2

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