Malicious PDF — malware analysis report

Static analysis result for SHA-256 379dba8a53a07fda…

MALICIOUS

PDF

84.2 KB Created: 2021-09-06 11:51:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2994eef5166ca0914cac7b2e9bb48392 SHA-1: 1e28bb6ab9ce7cc164ece421bbeb34be0666f757 SHA-256: 379dba8a53a07fda752d3b7acc2173195d6fea65127698dce2224eccc93338aa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various websites, many of which appear to be compromised WordPress installations used for hosting PDF files. The primary function seems to be redirecting users to these external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://philabc.ru/uplcv?utm_term=el+expediente+clinico+pdf PDF link annotation
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160abf8d246436---47353136773.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c9f968b0966---lusutijapeladisozofasoxu.pdfIn PDF document text
    • http://ctkupavna.ru/upload/file/8124258626.pdfIn PDF document text
    • https://yourownadviser.com/ckfinder/userfiles/files/68453162883.pdfIn PDF document text
    • https://bloomland.com/sites/bloomland.com/files/xakifadiwogajunaf.pdfIn PDF document text
    • http://santeh.md/img/files/90830306361.pdfIn PDF document text
    • http://lionsmarsala.it/userfiles/files/jakidalutinawawesajaba.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16135887e294a1---93704995597.pdfIn PDF document text
    • http://magnachip.cn/userfiles/file/20210521233117.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/c715f53c1e9b2569e4e60f107ab6da71/ferozipisijivun.pdfIn PDF document text
    • http://cocoal.com/uploads/file/16658625313.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/6oa9b76llmgsljkefmkpv8so16/nepirafanu.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a066598b5de---7652278909.pdfIn PDF document text
    • http://westernmaki.com/uploads/files/sobiserizebesokudowuvixik.pdfIn PDF document text
    • https://funcarele.com/ckfinder/userfiles/files/xabixapogomaxawepet.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba2a239e8e9---diwebatidifoguguwatuwo.pdfIn PDF document text
    • http://gibisch.biz/files/files/sumizirozolanobalaraj.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/jekifemefofumuzutizixuwil.pdfIn PDF document text
    • http://chroscina.com/userfiles/file/77661371924.pdfIn PDF document text
    • http://cleanyachts.it/writable/public/userfiles/file/purimatomozudod.pdfIn PDF document text
    • http://painttechvina.com/webroot/img/files/25096718786.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a174570b3d2---kiroxanoxew.pdfIn PDF document text
    • http://hagithanh.hagigroup.work/data/media/files/56997699106.pdfIn PDF document text
    • https://everestart.com/images/stories/file/dudipidi.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_off0000e40d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE40D 10268 bytes
SHA-256: 9a4467264f204653439779c7dbb18ad3debbc462f2502c0b806002d117ed6b0c
font_01_sfnt_off0000fb2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB2F 18776 bytes
SHA-256: 905d8c37394924dcfd6b9ba43df77cb8dad4edb6bc41c09fa0b8630bb280acf7
font_02_sfnt_off00012b4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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