Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae15ce8fa6e398a2…

MALICIOUS

PDF

84.2 KB Created: 2021-09-23 21:23:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6e3672e30066017bff44cdc58a6c5c05 SHA-1: a927bc8b643fd7828b6350ebb39b39cdd9b8f4ee SHA-256: ae15ce8fa6e398a247119851008f65b15b9f13da8d51bc522c2c6eb56fbea2ad
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as a phishing trojan. It functions as a link farm, containing numerous URLs that point to various websites, some of which are hosted on compromised CMS platforms. The presence of these links suggests an attempt to lure users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 http://dermatologomiguelgallego.com/miguel/fck/file/karubekobixif.pdf In PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/75e6cfd4e4bcaa2dd215aa3af22d7e85/39045746305.pdfIn PDF document text
    • https://meesens.be/KrMee/Tekstverwerker/paxebuwiwo.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/53192428930.pdfIn PDF document text
    • https://xn----7sbeo1acdy3adh.xn--p1ai/userfiles/file/lokemeditagixenosafabumod.pdfIn PDF document text
    • http://ekmeta.lt/failai/file/83409137992.pdfIn PDF document text
    • http://domuran.pl/files/file/perusifomimewoxi.pdfIn PDF document text
    • http://amsaneeraus.fi/userfiles/files/lewosoluximituwudefixaxa.pdfIn PDF document text
    • http://mariamozharova.ru/uploads/files/bijinigi.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16131bc3f0dfa4---99549841547.pdfIn PDF document text
    • http://otohondamientay.com/upload/files/kapuxeworinelukap.pdfIn PDF document text
    • http://koreaticketland.com/userfile/file/zegubaziwovafapubokibev.pdfIn PDF document text
    • http://machinesupplier.cn/data/product/file/202191_85311_363.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/28083447701.pdfIn PDF document text
    • https://leosservices.com/userfiles/file/tizafizunof.pdfIn PDF document text
    • https://sharjahcements.com/images/bulk_images/files/pejekubex.pdfIn PDF document text
    • https://hkki.org/userfiles/files/4047562696.pdfIn PDF document text
    • http://fujiya-la.com/uploads/files/zipivuwijipud.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a15d160843---mifiladuk.pdfIn PDF document text
    • https://marjoyunlar.com/calisma2/files/uploads/71223890784.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613389596741b---73515891903.pdfIn PDF document text
    • http://delfosventures.net/userfiles/files/nuwisunivebidelufuwokaji.pdfIn PDF document text
    • http://minhtoangalaxyhotel.vn/app/webroot/files/ckfinder/files/ziwunizijaxoxa.pdfIn PDF document text
    • https://lexcyberia.com/userfiles/files/35673581547.pdfIn PDF document text
    • http://ajeah-intl.org/fck_image/file/jabalokasadogemejopag.pdfIn PDF document text
    • https://timavoshipsupply.it/userfiles/file/zulusi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=how+to+change+android+device+countryPDF 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_off0000e405.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE405 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC1C 10792 bytes
SHA-256: 7f0e64d83f150b6e9cb3fa45874e0c6b77aac88c0599a3cb2f5bdfd4cb6e62c9
font_02_sfnt_off000114c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114C3 17620 bytes
SHA-256: c93a2cdc4e7b3f84063ca9d2c28263f0fadbcc5b7935bed1b0c33fbf0db2263f