Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c776f2dde5504f2…

MALICIOUS

PDF

82.1 KB Created: 2021-09-08 09:01:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 3fe9cf8df52227e2cf226a54476a0dba SHA-1: 8135a5c0c36a4ea095ed290f4b5f2f46f34139e3 SHA-256: 3c776f2dde5504f2ccda3c5f0cbdcf2d79ab1b65c5dea84d658aebbc9b3050d0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://xn--365-pn7mwb654m2qn.com/ckupload/files/fepired.pdf In PDF document text
    • http://arslanemlak.com/E/file/mopisajer.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/51936dd31a9ff19a35f79a8957595328/xaxelefokida.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160addd5081bd8---58652458257.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9b7d5ff67---6432710259.pdfIn PDF document text
    • https://ntiverification.com/userfiles/file/73128313059.pdfIn PDF document text
    • https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/5a9a3e920d2d84f6f3339ed8b579b27c/wolabowowabedomujejet.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/nuxigimigidipejixiris.pdfIn PDF document text
    • http://divodizain.ru/ckfinder/userfiles/files/rokup.pdfIn PDF document text
    • http://studiomanzella.com/userfiles/files/kasalurugatogitepawof.pdfIn PDF document text
    • https://christianklein.eu/Quansis/ckfinder/userfiles/files/965231905.pdfIn PDF document text
    • http://tulsacentral1963.com/clients/3/39/398188050227c7f1c8b3045a0a865105/File/rerojevebokipekepi.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/decb6b2d79fbaaf4abb692731a6d0648/sivusa.pdfIn PDF document text
    • http://poorclarescork.ie/images/54881169273.pdfIn PDF document text
    • http://yushendesign.com/images_fck/file/1629887333.pdfIn PDF document text
    • http://lukoilmarine.com/ckfinder/userfiles/files/71613403061.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ad8b3c238b5---fobinaxelevepum.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/60167724339.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/c5c2ef7338d139e459f3af2278799964/sukemuvolig.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c508e320826---wasamaz.pdfIn PDF document text
    • http://clipsttm.com/userfiles/file///pawakunun.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/14748336433.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/63f1a54163ee0b2a9b44ea1cbb9b0ceb/potabekadefubuxuzurifiw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=whirlpool+energy+star+70+pint+dehumidifier+with+pump+wdh70eapw+manualPDF 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_off0000d8f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F1 17940 bytes
SHA-256: b77444fe50c8dcac9f7012322c81ab15afbbeed028b551504cf61be499bcca32
font_01_sfnt_off000107b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107B1 11408 bytes
SHA-256: 2e18b72e9b7b5b8f64b00dbd26cee88df65d59076f7edd6ea27e3b4d7e32a977
font_02_sfnt_off00012255.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12255 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1