Malicious PDF — malware analysis report

Static analysis result for SHA-256 33623a82060a4002…

MALICIOUS

PDF

73.6 KB Created: 2021-09-16 11:00:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e8364e3f1268b0b4c89d153adb876fde SHA-1: 06729f1389be492355f693bc56a8bb36066f7089 SHA-256: 33623a82060a4002b297dab562fcac064af15ac86df44f3dd50a71297fdb37c8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains multiple heuristics indicating it is a phishing or malicious document, including ML classification and ClamAV detection. It directs users to a URL that appears to be a download link, likely leading to a malicious payload. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports the phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://nomylo.ru/uplcv?utm_term=daddys+home+download PDF link annotation
    • http://babijie.com/upload_fck/file/2021-9-14/20210914054259486031.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613d653fe789c---fejixurekajawufatoxurise.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/gofinepotenojakugulisuj.pdfIn PDF document text
    • http://uelzecht.lu/userfiles/files/51610060894.pdfIn PDF document text
    • http://abwwilson.com/uploads/files/gigoboji.pdfIn PDF document text
    • http://dailygameresult.com/editor/UserFiles2/files/fiwokabisag.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/fimivolisodekopixaguz.pdfIn PDF document text
    • https://izyskately.ru/foto/ck/files/gosexozazabenofav.pdfIn PDF document text
    • https://planningpvedh.nl/ckfinder/userfiles/files/1781434075.pdfIn PDF document text
    • http://satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/37705877740.pdfIn PDF document text
    • http://seksdagen.nl/userfiles/file/89155177976.pdfIn PDF document text
    • https://caraudioshop.ro/mm/file/vujinoxejok.pdfIn PDF document text
    • http://dogoxuavanay.vn/uploads/files/70387237697.pdfIn PDF document text
    • https://hogozaty.com/ckfinder/userfiles/files/zewipatasivojusajuzav.pdfIn PDF document text
    • http://kiavysocina.cz/UserFiles/File/50920924824.pdfIn PDF document text
    • http://lunaleo.pl/userfiles/file/54377713936.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc47fbbe52---kovadujapedivi.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/6370df68401cad1fd9c2778d0359742c/gamulap.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/n4ghkcfnf4e7rhg3v8s0ind4a2/39613027198.pdfIn PDF document text
    • http://jatechkj.pl/upload/fck/file/monemelubamekawime.pdfIn PDF document text
    • http://eapver.com/upload/ckimg/files/202109131228146093.pdfIn PDF document text
    • http://duoctruongxuan.vn/userfiles/image/file/mavekemutudamuripixawa.pdfIn PDF document text
    • http://morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613265f734ddd---wubugaxuxopujodigobuf.pdfIn PDF document text
    • http://maristaslardero.es/userfiles/file/sosireledavazosevelim.pdfIn PDF document text
    • http://shriadinathbank.com/uploads/jagokipodunasejagoga.pdfIn PDF document text
    • http://cu-hinothai.com/ckfinder/userfiles/files/25272972875.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_off0000bd90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD90 10424 bytes
SHA-256: 608fb8ef25c59cd65476f6e5feeee89ca121611f8815464eb5a8747d760cc1fc
font_01_sfnt_off0000d50d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD50D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ed1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED1F 16848 bytes
SHA-256: c46819cc610a5eca0cb913f464326f9f9af69c9fb721df571e85d66744ab5999

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