Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b6d3fae01aaa96f…

MALICIOUS

PDF

84.5 KB Created: 2021-08-24 23:47:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 77c53494674f3b38e91a170fc712ade5 SHA-1: bc62d8174bb78d6ede4f280c2505a2db65bbd3c0 SHA-256: 2b6d3fae01aaa96f29f31dd20efe031a8124ac9e178bb102a798368f16c7a5dd
96 Risk Score

Malware Insights

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

The PDF file contains a large number of links pointing to various websites, many of which appear to be compromised or hosted on disposable domains. The ML classifier strongly indicated maliciousness, and the heuristic firings confirm the presence of a link farm designed to redirect users to potentially harmful content. No scripts were extracted, but the primary attack pattern is the distribution of malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/g9iqa36uo4hao22fmkp7itdusk/vilijowene.pdf In PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160992ae1668ab---venadakidenejigoparar.pdfIn PDF document text
    • http://gancza.pl/userfiles/file/13199506711.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/6pu59aa8bp7n171epbq8j0jlbc/punod.pdfIn PDF document text
    • http://ilsungwarehouse.com/userData/ebizro_board/file/90779702357.pdfIn PDF document text
    • http://studiodabo.eu/userfiles/files/pukajixuradaf.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bdc3e237d8---zilof.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/2rvdemrs02mfi290s5qopnt661/lifekubinudujerosifabu.pdfIn PDF document text
    • http://sochi-polyana.com/ckfinder/userfiles/files/zosigitoguza.pdfIn PDF document text
    • http://salon-urody-bellis.pl/images/file/polasovupufemurav.pdfIn PDF document text
    • http://zuche0551.com/upload/file/32450277908.pdfIn PDF document text
    • https://dubaimotorcycletours.com/uploaded_images/files/toxozotizakebitodad.pdfIn PDF document text
    • https://saatyapi.com/upload/ckfinder/files/zizub.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b8551b875b4---nuvafakugizozur.pdfIn PDF document text
    • http://123podkrovie.sk/editor_uploads/files/ziwejiximisuxufesu.pdfIn PDF document text
    • https://noriupapildu.lt/ckfinder/userfiles/files/nemib.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b4500c204f4---pemamuvirisonojigum.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/889f96cebcd5456f96fa340b41083ad9/38130377766.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/0eebvi35np7ika429l045cp0r3/45427150219.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4bdbe21503af07a274728ccf1c447525/gemevuxanorixawenulavaga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=food+collection+near+mePDF 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_off0000e70d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE70D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF24 10340 bytes
SHA-256: 28b87fadeeec7d0f282e152a8eba2fe85d8d0ceb9a6eda41d6bafd093af96ea1
font_02_sfnt_off00011660.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11660 17376 bytes
SHA-256: c1c7a3c9818e10457da079ce76f3d5c7abf6e645be8e4783a9bcfd6fe3eb8bb0