Malicious PDF — malware analysis report

Static analysis result for SHA-256 b67227e577856c75…

MALICIOUS

PDF

80.6 KB Created: 2021-09-24 00:56:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7acad60e9337fe7521601a7b8ab5d5d2 SHA-1: bff40ebc7018fc6ddce92edeb86e1ce62ab64e63 SHA-256: b67227e577856c75d124f5e22185481581bbb9dcd459854fa60082bb1407b2b1
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URIs pointing to various websites, some of which are also PDFs. This suggests a phishing or malware distribution scheme, where users are lured to click on links that may lead to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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=pokemon+heartgold+portal+roms PDF link annotation
    • http://gzbaosui.com/uploadfile/files/dasijejevuw.pdfIn PDF document text
    • https://taumed.kz/upload/2021/09files/210919222932225323bkxgy.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613d37267884b---lemef.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141a1a3ac5bd---53694696066.pdfIn PDF document text
    • http://thegioichuyendong.info/app/webroot/upload/files/kosofiba.pdfIn PDF document text
    • http://cristal-in.fr/userfiles/file/suxurotozojemepimuresa.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/nizepuxogesozotuligud.pdfIn PDF document text
    • http://dalhousieretreat.com/cote_dor_import/admin/ckfinder/userfiles/files/68769142204.pdfIn PDF document text
    • http://zzquansu.cn/d/files/wegozozigagid.pdfIn PDF document text
    • https://www.casestilistas.es/ckfinder/userfiles/files/pedonikitafibowi.pdfIn PDF document text
    • https://panegovernance.com/ourprojects/chowki/UserFiles/file/luxogeluwamiwolilexuxiv.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0c6f4b66dbfcf721798dc4a885417f81/1084842898.pdfIn PDF document text
    • http://whitedwarf.ru/public/images/ckfinder/files/zubakuworuredukur.pdfIn PDF document text
    • http://e-photo.lv/ckfinder/userfiles/files/tunukewas.pdfIn PDF document text
    • http://www.jfac.kr/ckfinder/userfiles/files/73624010861.pdfIn PDF document text
    • https://tiemhoamo.tiemhoahaibara.com/data/dulieu/files/19106603846.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/47624360c023067e651cd2067d664e42/witevasolujovedadegasalal.pdfIn PDF document text
    • https://goodmix-psc.com/userfiles/files/mivofozobom.pdfIn PDF document text
    • http://opt-russtd.ru/data_center/upload_pictures/file/38422270131.pdfIn PDF document text
    • http://www.samuitns.com/image/upload/File/xefom.pdfIn PDF document text
    • http://vasekurzy.cz/userfiles/file/54806123576.pdfIn PDF document text
    • https://red-adlay.com/upload/files/bodulegunonol.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/56b2t7pkce38d6ifpd2dspsu07/309017313.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_off0000d470.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD470 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC87 10840 bytes
SHA-256: 86b54d1bb6d104124c65b87813cf5cb73066e46cce66a94ac2167f3908d333fb
font_02_sfnt_off0001052b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1052B 18164 bytes
SHA-256: 9f6154cef1ba4bc264d0b2189e202e04c03b73648501f2db14c3c48c1ab08e21

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