Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5176c677819859c…

MALICIOUS

PDF

70.2 KB Created: 2021-09-30 13:22:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 12f981e6b376b0bb68b92a6c32806925 SHA-1: 394c45622b8a167262fe5fbc54eac77de8056692 SHA-256: d5176c677819859c2d68ba42e13bccc99207e46cac8e98d9b06c0c7607b61279
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are part of link farms hosted on disposable or compromised domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The presence of multiple external links suggests an attempt to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://inwebjor.ru/uplcv?utm_term=pay+per+view+apk PDF link annotation
    • http://mayepnuocmia.vn/data/ckfinder/files/92689494002.pdfIn PDF document text
    • http://enjoy.sk/editor_uploads/system/files/nerababitesebegu.pdfIn PDF document text
    • https://ijp2.com/contents/files/91416133970.pdfIn PDF document text
    • https://equipelec.fr/ckfinder/userfiles/files/43019279580.pdfIn PDF document text
    • http://tl-maskinfabrik.dk/userfiles/file/28635086332.pdfIn PDF document text
    • http://e-district.org/userfiles/file/febonozafutekap.pdfIn PDF document text
    • https://uclerbaklava.com/resources/file/lopome.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16155848d8eae7---xexikozesusozowum.pdfIn PDF document text
    • https://allcondosales.rodeodrivecondosale.com/userfiles/files/bogisurulevarezomata.pdfIn PDF document text
    • https://jaurrieta.net/USERFILES_JAURRIETA/files/93538440320.pdfIn PDF document text
    • http://5mal4.de/moneyvidya/web/images/userfiles/file/64391674074.pdfIn PDF document text
    • https://linhquan-group.com/upload/ck/files/fuxipaxovena.pdfIn PDF document text
    • https://brincandoeaprendendo.com/fotosempresa/files/60191937636.pdfIn PDF document text
    • http://zechnerbau.at/images/content/files/71544085450.pdfIn PDF document text
    • http://solo-reisen.com/media/images/file/sifovogolexokamanodavas.pdfIn PDF document text
    • http://skkouty.cz/ckfinder/userfiles/files/xolixonolanorigu.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc00c8dea9---jukatewejaxuko.pdfIn PDF document text
    • http://dwallacelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/raxofalemakulo.pdfIn PDF document text
    • https://commonlawhouse.in/userfiles/file/nafebegejixefirut.pdfIn PDF document text
    • http://www.sm.ac.th/ckfinder/userfiles/files/14524885213.pdfIn PDF document text
    • https://denimder.org/resimler/files/18760082802.pdfIn PDF document text
    • http://gyogytornasziget.hu/uploads/files/tafemulinezomunala.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/0f44fec2f331141fe00730d41790c414/jogutibipoberexigeve.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16149133c56eaf---sefezikujes.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613adcfa33a5f---30335121617.pdfIn PDF document text
    • http://itnetworkconsultingsf.com/helpdesk/app/webroot/img/userfiles/files/15205639996.pdfIn PDF document text
    • http://mclarenquartz.in/ci/userfiles/files/fazamarep.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_off0000b2dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2DC 16060 bytes
SHA-256: dfde19677b4ddabba8ab3a37af8cd657de5446646bc651d69c68a3b735c031f7
font_01_sfnt_off0000db3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB3C 10068 bytes
SHA-256: 0bb6c762e3d1bb3bbbc8afbb2efaf552517075231123495c50651817725f2a70
font_02_sfnt_off0000f1cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1