Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cc5ca409e8806fd…

MALICIOUS

PDF

78.2 KB Created: 2021-09-02 19:31:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5b97461cb8ca4c4fb4e2d9ee78e01fc0 SHA-1: 19daad9fd333ea0f706dd88cad0fb429e3a41870 SHA-256: 2cc5ca409e8806fd3bb2092a91e80bcadfdbbed227d2cf4780610505c1ac3401
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous URLs that point to various external websites. Several of these URLs are hosted on compromised WordPress sites or disposable domains, suggesting an attempt to distribute phishing content or further malware payloads. The presence of these links and the nature of the hosting environments strongly suggest a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://inwebjor.ru/uplcv?utm_term=squid+proxy+manual PDF link annotation
    • http://industrialdevices.in/uploads/16870851701.pdfIn PDF document text
    • http://www.zaluziemalina.cz/userfiles/file/96152015482.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0129c4ea6c---vuzexebipavof.pdfIn PDF document text
    • http://broadmoor79.com/clients/864886/File/tirufufumef.pdfIn PDF document text
    • http://aodaibooking.com/FileData/ckfinder/files/20210805_56F817A06CEC11B6.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/iptr9208f6q8j3rlp50iuiu4ie/josidikosuf.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/2479147e9c830f7d5634098f2e67df40/xijonaxopi.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/a0c32c479d9851863b1ce402f84e5bd4/xomenatuxadopin.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/lanexunafajof.pdfIn PDF document text
    • http://amctop.com/board_data/editor_img/file/202105250258.pdfIn PDF document text
    • https://csam-villepinte.org/uploads/images/file/21633027527.pdfIn PDF document text
    • http://hydrem.ru/images/file/jexitopuviraju.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/66915341677.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/61560fc5ad8dabb2ae45fcf0a6ceb515/82611930415.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160705abd43d57---83102842725.pdfIn PDF document text
    • https://armenia4d.com/contents//files/ximofimatidifape.pdfIn PDF document text
    • http://poslovniimenik.net/firme_data/files/lobebakini.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7640ae251---raparubapakejogikoposi.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac69e79cf76---99474003997.pdfIn PDF document text
    • http://lactopad.com/uploads/files/kizojibizofuj.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/91e722d59311a05aea3994f34040fead/vulatorafuwobi.pdfIn PDF document text
    • https://parokisantolukas.org/Uploads/userfiles/files/13786797966.pdfIn PDF document text
    • http://be-now.pl/userfiles/file/15459697121.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_off0000c75c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC75C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF73 10692 bytes
SHA-256: d37c37161b92ed2f28c27d901f4538a40ceecfdc64362bbaf1bd8b0e1390aab8
font_02_sfnt_off0000f7b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B4 20340 bytes
SHA-256: 04e4c4d314447e75312532d375be46d5e55143e41552b749f6ea7d7447986db7

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