Malicious PDF — malware analysis report

Static analysis result for SHA-256 43d80ae9fc38f094…

MALICIOUS

PDF

70.7 KB Created: 2021-09-17 11:45:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 744976228d574dcad07e2d4df12d1483 SHA-1: 7a5b5d3289c81324207ab89374c81a476751a46c SHA-256: 43d80ae9fc38f0946c5b9793540196ca48db8b8ea9793239377bb520ddedabaa
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple domains, several of which are associated with compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites. No scripts were extracted, but the structure and URL patterns are consistent with phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://atputasbazes.lv/images/userfiles/files/24994464418.pdf In PDF document text
    • http://ahzgbh.news-read.com/upload/files/wisotupitiselujewi.pdfIn PDF document text
    • http://crestviewshopping.abwingsmd.com/uploads/files/49827916169.pdfIn PDF document text
    • http://lachambredechos.com/userfiles/file/mamugiwamotemug.pdfIn PDF document text
    • http://hatowo.com/app/webroot/uploads/files/mopofofumugigijim.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/bmhgo7g1gv8anuuvlm54su88uf/jezonukuzumininovi.pdfIn PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/paxezugabun.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/efp19f56cm1lblkecvd2n4h47u/78064869341.pdfIn PDF document text
    • http://silarperu.com/UserFiles/file/dipivoz.pdfIn PDF document text
    • http://motivationandmomentum.net/ci/userfiles/files/95907816190.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd98464a53---tefogofezawovefupajova.pdfIn PDF document text
    • https://zippy-inc.com/app/webroot/userfiles/files/zinikaditikidu.pdfIn PDF document text
    • http://alda.pl/ckfinder/userfiles/files/vatizozitesunegixor.pdfIn PDF document text
    • http://massvt.sk/editor_uploads/system/files/75967322852.pdfIn PDF document text
    • http://vinhosnorte.com/images/files/sobawavonono.pdfIn PDF document text
    • http://immobilieninvestors.net/userfiles/file/93391121381.pdfIn PDF document text
    • https://sistemagestiondpr.com/userfiles/file/ponovegetutefa.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/12a398ba856bad57a66902530604aa2b/kudom.pdfIn PDF document text
    • http://xn--xhq021fvrwdth.com/d/files/lomutekolu.pdfIn PDF document text
    • https://rt-totaalafbouw.nl/userfiles/file/jalevi.pdfIn PDF document text
    • http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/46773662041.pdfIn PDF document text
    • http://yogaschoolofkerala.com/photos/editor/files/zizaritejasizi.pdfIn PDF document text
    • https://madeinstlucia.com/userfiles/files/dogopikexovilafeb.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/ep57k4vurs1gdks1f9d69h7ck0/peligapovivigipo.pdfIn PDF document text
    • http://wxbeimei.cn/upload/ckimg/files/202109110218432493.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=limit+network+speed+androidPDF 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_off0000b73d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB73D 10644 bytes
SHA-256: bf01a466a460507857b91ba2a9cddc4e908dbaf076ed1f0f8d8bd7c083868edb
font_01_sfnt_off0000cfa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFA3 14632 bytes
SHA-256: c594580c50e811bdb021cc45ff0fff8dff3ec8e10e950cbf0139ab3af20a26ab
font_02_sfnt_off0000f47a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF47A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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