Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a911af409f7d379…

MALICIOUS

PDF

79.6 KB Created: 2021-08-15 04:50:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 38c00288d5ba05cbde17ef478914246c SHA-1: 8e2b17b9b2039324dc9680291d98a966f5342b5e SHA-256: 3a911af409f7d37975cf2eb6014665f2783c880f9241deabf41bf635651c9ade
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the overall structure indicate an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/3f4c1da492a31c8d044102fe271493c1/relozixux.pdf In PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085e43008e63---lurapumifaru.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/231c53914e50321b7e3e1a09612cfe46/60984903711.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/nitibepurubabi.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100e153f3ab4---48181108211.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/80493544625.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1b66a23315---kawex.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/pesavutesumeja.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160f20cb742f3d---tatisajesevibot.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/o7tbjrd17c1ip7jtf6stsrtisk/dibojijexupimufanelaku.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608767891bad3---41205899975.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/4bd0bc34243a33830dbf97fd569ab0ca/bonodujuzapukirunukepa.pdfIn PDF document text
    • http://recko.ru/ckfinder/userfiles/files/segop.pdfIn PDF document text
    • http://guowangcable.com/d/files/ganozafobafes.pdfIn PDF document text
    • https://foodphotoshop.com/userfiles/files/nafakusiwu.pdfIn PDF document text
    • http://sbairs.com/datas/files/mejaxo.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/880bc7ab08ae0e09ffb352a06814d2be/didimuj.pdfIn PDF document text
    • https://csn-alliance.com/data/files/25186199387.pdfIn PDF document text
    • http://trips-in.com/ckupload/files/betadorule.pdfIn PDF document text
    • http://billagelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/99890114484.pdfIn PDF document text
    • http://systemsbiology.at/uploads/assets/file/55314151824.pdfIn PDF document text
    • http://samromschool.com/UserFiles/file/50264602882.pdfIn PDF document text
    • http://polipadel.com/userfiles/file/11378244634.pdfIn PDF document text
    • http://ildungrice.com/fileupload/fckeditor/file/27860471510.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=how+can+i+test+my+laptop+batteryPDF 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_off0000d3c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3C0 16552 bytes
SHA-256: 7b1195bad328f68b2e8e2503966f7c51f5df4ad8b52db7abd2a238e23921e4dc
font_01_sfnt_off0000fee7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000116fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116FE 10868 bytes
SHA-256: b556e23cd00ca4ec1b75f6e1003a9c67e6a7661156e6c51e6207e6b616f452ae