Malicious PDF — malware analysis report

Static analysis result for SHA-256 45b1062916a35371…

MALICIOUS

PDF

73.2 KB Created: 2021-09-15 13:04:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 701ca0a41858e8c275391f4b2caceb02 SHA-1: a73121abbfa9bede785530b9d134411065c781ed SHA-256: 45b1062916a35371fa961631f6332f1c9fa1c3bade986f77c5056cfce4071980
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple domains, many of which are associated with compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites, likely involving embedded JavaScript for obfuscation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://oniceh.ru/uplcv?utm_term=calculator+hide+apk PDF link annotation
    • http://hamlineparkplaza.com/assets/amund/ckfinder/userfiles/files/fijinawulelorikajun.pdfIn PDF document text
    • http://lednotice.com/userData/board/file/vumoripujonurutonimem.pdfIn PDF document text
    • http://alpinist.store/sribati/editor/uploadfiles/86644050194.pdfIn PDF document text
    • http://orderkai.com/uploads/files/88171746710.pdfIn PDF document text
    • https://escolaalfa.com/userfiles/file/30464135594.pdfIn PDF document text
    • http://webinaris.org/ckfinder/userfiles/publics/files/15494696831.pdfIn PDF document text
    • http://avstralianature.ru/ckfinder/userfiles/files/wofovetux.pdfIn PDF document text
    • http://wellogo.in/userfiles/file///51165834796.pdfIn PDF document text
    • http://cestovni-postylka.eu/userfiles/file/bafigerisujuno.pdfIn PDF document text
    • http://m3hotels.com/userfiles/file/rasawewezarugavo.pdfIn PDF document text
    • http://tolltisztitas.eu/userfiles/files/rorivamibamixupotex.pdfIn PDF document text
    • http://www.madiran-cruduparadis.fr/ckfinder/userfiles/files/lazekufasovezenusefonene.pdfIn PDF document text
    • http://newabel.com/ckfinder/userfiles/files/41111013823.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/16139c4c9f3eb0---nisuvopulezexoxirox.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/c4prqituflm2sllj5fftkuktf6/legafudowiv.pdfIn PDF document text
    • https://loyd.rs/images/file/24905473207.pdfIn PDF document text
    • http://demenagements-remond.fr/userfiles/file/20210904150446.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/35358155455.pdfIn PDF document text
    • http://aquaclub.hu/userfiles/file/nasoletidebuterokabu.pdfIn PDF document text
    • http://buyyoutubecomments.com/ci/userfiles/files/10913688267.pdfIn PDF document text
    • https://debo-fit.be/userfiles/file///vuguti.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/4oehd99ddnuocj96icmvc17emn/40405048026.pdfIn PDF document text
    • http://familiehollander.nl/images/uploadedimages/file/94508396050.pdfIn PDF document text
    • http://www.singchai.co.th/ckfinder/userfiles/files/34284496063.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_off0000bb1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d332.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD332 10564 bytes
SHA-256: cd3c571801f5c8cde30308e4d3b75db450a459bb831d5b2f1b7fe5d6c4616037
font_02_sfnt_off0000eb6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB6A 17048 bytes
SHA-256: e3fcda54db75a60ebca6d936e7a8669a3a5813dee1c9555d4b10beba5d39fcfa

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