Malicious PDF — malware analysis report

Static analysis result for SHA-256 82f36efa16c2ba95…

MALICIOUS

PDF

102.9 KB Created: 2021-07-21 09:31:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 612954d8c4f3299a01bbd9e040d3c15a SHA-1: fe0c9b4e2047f33eb45458b27fa05babb6af4628 SHA-256: 82f36efa16c2ba9534d74a2a5567e996b6ac72da70b9810140938069b55229fe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

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 http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/nrkuq8qn4rp15esm5keql54u85/zopegogotigajujirudika.pdf In PDF document text
    • https://fokusmedia.com/images/uploads/xusekifejavobafolozagi.pdfIn PDF document text
    • http://myshopgroup.com/userfiles/files/lafaxexorixem.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/4684a66a5794f3b75f60a426a13c3f9f/kasoxajixixifijo.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e5dcb490e---66618102231.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/mofobololepiroxun.pdfIn PDF document text
    • https://www.geya99.com/ckfinder/userfiles/files/84010136445.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/l7sg1jui8t275jtkhosms7bdr6/mijused.pdfIn PDF document text
    • http://sushrutproctology.org/ckfinder/userfiles/files/selibev.pdfIn PDF document text
    • https://www.aukuras.org/ckfinder/userfiles/files/59233819679.pdfIn PDF document text
    • http://beadsandsupplies.com/images/file/91120791737.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/983qksf2e9l5ljhqjb1ugui9kk/dotavizebiv.pdfIn PDF document text
    • https://o2opr.co/userfiles/files/valikufo.pdfIn PDF document text
    • https://paperland.bg/uploads/file/93422480931.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/918a91760e3d7bde9ba7120c8a46e7c5/vinexugalus.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5caa9ce531---49085051001.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/aee3dc0132bf804c8e3357558d4fd814/92121999978.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b22f889ddc7---63102203802.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/f474d904cae6d71511a0d22d9bf536e5/46449624026.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160762d264d0cd---pedajiwivozifine.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/74nboaa7ta34s7707fkucjg1p0/69725389092.pdfIn PDF document text
    • http://tuttotop.com/userfiles/files/79967335261.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=ergodic+theory+dynamical+systemsPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010ee6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EE6 10916 bytes
SHA-256: 122ded936116992b604b61fabb7939807da295b8ed26f020908d9ebacc7cf95e
font_01_sfnt_off000127bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127BF 16084 bytes
SHA-256: 325c5f5cda05429ae92d15c23118ca1b8712e485108c584e1e30b0ff615913b7
font_02_sfnt_off00013ce7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CE7 21548 bytes
SHA-256: 039a04d4b7b323726b66b9eb557d1a959f459e20dd92a09cb5ed7b6e0c52217c
font_03_sfnt_off000175c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x175C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1