Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fc6ff82140f0883…

MALICIOUS

PDF

75.8 KB Created: 2021-09-17 20:24:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f7e51c5fe008d9a6c4fcc30c5af836d1 SHA-1: 8c988f40f22b5bb6b83bfc44bad915511dadd06c SHA-256: 4fc6ff82140f08832615b1e1ed7f15836ec73bdb30a829525f07afceb41f9f3c
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It functions as a link farm, containing numerous URLs pointing to compromised websites, likely to lure users into downloading further malicious content or submitting sensitive information. The presence of multiple external URIs and link farm heuristics strongly suggests this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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=super+breakout+atari+2600+rom PDF link annotation
    • https://a-guskov.ru/uploads/files/57132965551.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/161386ab39f700---65134765877.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/9383140b5aeb72ded56a601852ad3f50/jaribixepadilin.pdfIn PDF document text
    • https://amigo-shop.105h.net/upload/files/wopunobipuveluxakufozetok.pdfIn PDF document text
    • http://cheers-gifts.com/userfiles/46227836409.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/41302160a1b8b29621650c11dbcbed61/nijizadalijebimoregogaxol.pdfIn PDF document text
    • https://villanakarin.com/userfiles/files/losefimuzozug.pdfIn PDF document text
    • https://nawaasha.org/userfiles/file/46655501858.pdfIn PDF document text
    • http://inter-travel.hu/_user/file/70196289797.pdfIn PDF document text
    • https://hklh.vip/data/attachment/file/zigafurut.pdfIn PDF document text
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/35660828780.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/1fafc12430735519327efe541a6e0360/reroki.pdfIn PDF document text
    • https://ms01bet.com/contents/files/35317102829.pdfIn PDF document text
    • https://santa.sg/images/users/00000000/files/dojemejav.pdfIn PDF document text
    • https://lee-trading.tw/archive/upload/files/mojivenadopilositefo.pdfIn PDF document text
    • http://nirmalamathachurch.org/cms_uploads/image/file/80614724241.pdfIn PDF document text
    • https://bachson.net/upload/file/4084825691.pdfIn PDF document text
    • http://gerocuki.hu/user/file/vipetefafanoz.pdfIn PDF document text
    • http://pravkniga.ru/files/userfiles/files/pajojukudakisomowiwobolow.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1613b4c1b4e9fe---34142139839.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/3db4398b222e04fec734c2ca75fe7a34/movipu.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/fs7d9si35dvg26gjgf4qidpm1n/xiwosezokivebakesezev.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16141da253e9a0---rewomu.pdfIn PDF document text
    • https://khotelmarket.com/FileData/ckfinder/files/20210915_B2A7DCC48C00CF18.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_off0000c1e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d9f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F7 10912 bytes
SHA-256: 8714609ff41ebad2af8ff459d58a7cb9713bbadfab269e97dec414848fe2918b
font_02_sfnt_off0000f319.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF319 17488 bytes
SHA-256: c942155c69cc5c66e6051fdb4974f44e02f81eb9eafaf820d98a64966abd2d20

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