Malicious PDF — malware analysis report

Static analysis result for SHA-256 71f60300a3571bdb…

MALICIOUS

PDF

84.4 KB Created: 2021-09-06 23:13:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 88732350226952d73d542052642440be SHA-1: a9b9767d048d1c043723bc3a4a1923ec9da19998 SHA-256: 71f60300a3571bdb5a57f8b24f7fce769b216b9c228026ed8488aa94d2d4cb50
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised websites and disposable hosting. The embedded URLs and the nature of the heuristics strongly suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://pointvirgule.ca/upload/editor/file/21995342517.pdf In PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/3e0cq65d4eals5fkig4kda7fso/pimakavakulepevopo.pdfIn PDF document text
    • https://vsetinrally.cz/userfiles/file/93424772214.pdfIn PDF document text
    • http://yorktownhs1987.com/clients/57482/File/15099544874.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/wibifutunur.pdfIn PDF document text
    • http://hadt.vn/upload/files/tikazigepu.pdfIn PDF document text
    • http://utuin.net/files/fckeditor/file/56883462254.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d4f4afae4---lobuvawufuvebodovesa.pdfIn PDF document text
    • http://jtipartner.com/ckfinder/userfiles/files/jologatenipafukanatux.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1d7355e964---10222992169.pdfIn PDF document text
    • http://tksvolga.ru/userfiles/file/redajumok.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/91034017982.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/bfhi63eedegkd44tpnhob5ualk/68006758765.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16080da1604fe1---88985891910.pdfIn PDF document text
    • https://designclarf.it/file/vasalexekanuleduzojidafuk.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/bb03626ad05becf8a8617db77c0788cb/kezepaf.pdfIn PDF document text
    • http://imhkayseri.com/resimler/files/62262073959.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/e010f05309c501a4f7a33270e5cc2910/liwuzibebaruk.pdfIn PDF document text
    • http://thicongdiennuocmiennam.com/uploads/files/nelijijufo.pdfIn PDF document text
    • http://boldogelet.hu/media/4395700999.pdfIn PDF document text
    • http://dimexautomarket.sk/ckfinder/userfiles/files/xutetedisinalerewifuja.pdfIn PDF document text
    • http://xn--4k0b43gkwo4gn.com/upload/editor/file/lexunizosukukapujoworuji.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2b3ff163d---6558777299.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/be55a165ea901f481d0fa3a68e9cb997/88765206274.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=bajaj+boxer+service+manualPDF link annotation
    • 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_off0000e48a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE48A 10884 bytes
SHA-256: 2dee1a3336682a2044aec312b9da1cefc7db1bba39d92b83eed4201e43a71cd2
font_01_sfnt_off0000fdb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000115c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115C8 17728 bytes
SHA-256: 88505c4300ca6f62692375266fed74b51e7467253a6a0c41b93ba7c2e12dbc6c

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