Malicious PDF — malware analysis report

Static analysis result for SHA-256 544f4a41bd9201de…

MALICIOUS

PDF

85.7 KB Created: 2021-09-12 12:31:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c786fba9b78385562f08e7b86c2c56ea SHA-1: 28ffb76fa1fbe73cf45e385a05353146a6b3ae84 SHA-256: 544f4a41bd9201de427d29503b9b83c4202c6c423b5bc1a83907ad37e894948a
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a link farm pointing to compromised CMS uploads and disposable hosting. The ML classifier also returned a high probability of maliciousness. The embedded URLs suggest an attempt to redirect users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 http://pho32shabu.com/uploads/files/wozapejodamexusitetaw.pdf
    • http://uspeh-kursk.ru/ckfinder/userfiles/files/wirapekorexawe.pdf
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/b5c8ccb78df423fc2e1b156695090570/76637249028.pdf
    • http://www.pranabkumar.com/fckimages/file/61097239796.pdf
    • https://alpasol.e-giant.net/upload/files/47164797101.pdf
    • http://studiofantino.it/userfiles/files/pagez.pdf
    • http://jamalcar.com/userfiles/file/40116357152.pdf
    • http://gatewayhotelbangkok.com/upfile_hotel/files/82000269594.pdf
    • http://tabbanbros.com/admin/fckeditor/editor/filemanager/connectors/upload/file/49278529117.pdf
    • https://greenboo.vn/uploads/files/bumafekuxajaze.pdf
    • http://residencecarlofelice.com/userfiles/files/xijedubuzapapoler.pdf
    • https://salondumariagededijon.com/userfiles/file/57288017095.pdf
    • https://happycondo.leaddeehub.com/userfiles/files/50961391348.pdf
    • http://polipack.ru/content/file/87187587040.pdf
    • https://bokaichenyu.com/upload/files/lizebezopumenezumijedipo.pdf
    • http://energosol.pl/images_cms/file/nasazofazadavuvejaj.pdf
    • http://kepco-group.com/uploaded_files/userfiles/files/71559712953.pdf
    • http://beiwendq.com/userfiles/file/kibiba.pdf
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/hs8gjap0ptvpccm1d5hjaind68/44750012792.pdf
    • https://yaslibakicisi.net/userfiles/file/wibivofo.pdf
    • https://tradingphrases.com/userfiles/files/17330881564.pdf
    • http://lnv-cnc.gr/userfiles/file/16979849386.pdf
    • http://sicompk.com/survey/userfiles/files/junizonodupuv.pdf
    • https://xedulichhaiphong.vn/images/news/files/valupuzabiferave.pdf
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613413e47fbb1---xixeretupogiv.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=minna+no+nihongo+2+mondai+answer+key
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c58b.bin
bebffb9182cce8b5f39202f3d038bac18dec608dbea8d82be796f005eafc8d5c
pdf-font-stream PDF embedded font (sfnt) at offset 0xC58B 10956 bytes
font_01_sfnt_off0000deb1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB1 16792 bytes
font_02_sfnt_off0000f6c2.bin
5abd5f992dcbf03b21348d2ddc260166ca11f9aa781510e220b744b6dad7e4c7
pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C2 16252 bytes
font_03_sfnt_off00010cd1.bin
fe73cdc00f683faf87ccc1080d1cf4d5ba462aa3c51aec0709a837f69e17620d
pdf-font-stream PDF embedded font (sfnt) at offset 0x10CD1 23644 bytes