Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1e6d5c3acbcf581…

MALICIOUS

PDF

86.9 KB Created: 2021-07-02 11:06:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f345947739991fb074db1d4f1b3ba9dc SHA-1: 0aef582e3b59dc7002a9b3093289095f1da490a6 SHA-256: a1e6d5c3acbcf581f58b86503e1739e430c722f6ca16d59abd7b5d31af877118
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting an attempt to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and link farm indicate a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://bhsclassof70.com/clients/a/ac/acf0241a72c9eb28a719a759cf8a4748/File/38071333719.pdf
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/839cfd7131f1b5206ca7527d55be2ed9/1034132602.pdf
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160be494540041---bizazaroxitogij.pdf
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609fddf33fdf4---bodunid.pdf
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/804db74ca4bd912d2cb42219c1cb5cd9/72303540352.pdf
    • http://eclickapps.in/userfiles/files/93396160483.pdf
    • http://ekolojikweb.net/upld/userfiles/file/21615718542.pdf
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b63aed06171---fopaxonamikexawiguxo.pdf
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160951d222ef5c---masipupino.pdf
    • http://burchiellati.com/file_fck/file/xedito.pdf
    • https://bacninhonline.com/webroot/img/files/41090899722.pdf
    • https://burkina-businessschool.com/business_school/uploads/file/73724057205.pdf
    • http://agendatourvietnam.com/hinhanh/file/xiwexedelebitukotozurob.pdf
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/1629a9bfa9c13132c103291de748414c/33886956073.pdf
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160bc7c6f6bb9d---67504457076.pdf
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/306f180d49bb8df8c8e2050ff5e8b7b8/9520335520.pdf
    • https://abeess.com/userfiles/file/9012685978.pdf
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c0d6077aa26---vazox.pdf
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/m7nb6kdgc9iblkqscvo5qjnvcb/bosubalu.pdf
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/hd2sp6bqmar3nlkf3lck6nptv1/52972739281.pdf
    • http://lorichphoto.com/pictures/file/dovatew.pdf
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/k3hop42u47mut2k8nr3amclg35/jugekidadawusikovabodotup.pdf
    • http://jar-ted.pl/file/30767714484.pdf
    • http://marcobernini.it/userfiles/files/49553833436.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+suck+your+own+breast
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f189.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF189 16792 bytes
font_01_sfnt_off0001099b.bin
3b4ba60d571a5179c5d6d72e82f580663ed2646d45709ec93c1d2d8b9993ac38
pdf-font-stream PDF embedded font (sfnt) at offset 0x1099B 16932 bytes
font_02_sfnt_off000135dd.bin
5ad8d98c00a987b5628d0e5065d490435bfdcfd9690f1d726ea5d2a4c7a65700
pdf-font-stream PDF embedded font (sfnt) at offset 0x135DD 10608 bytes