Malicious PDF — malware analysis report

Static analysis result for SHA-256 7434cbca73d704de…

MALICIOUS

PDF

96.8 KB Created: 2021-07-27 03:54:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c231fdf549d5735577c5ef5217cf40df SHA-1: e1df56e6e15f1d7b2fe1042583682d601aec3fa6 SHA-256: 7434cbca73d704de033958ce90667f0af80500fb2c9c702d872ab7e5f2f97dad
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs that point to compromised CMS upload directories, suggesting an attempt to lure users to malicious sites. The presence of multiple distinct hosts and the use of 'utm_term' parameters indicate a potential SEO poisoning or phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1c0e966a9---najazovavebadexiduza.pdf In PDF document text
    • http://esipro.fr/userfiles/file/19082569323.pdfIn PDF document text
    • https://fivetc.vn/uploads/files/webuzileremobuzaruw.pdfIn PDF document text
    • https://www.vbclighting.com/wp-content/plugins/super-forms/uploads/php/files/7bc276f208c784cc4b5fe9988b081ba8/gugexurofudiguxa.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160829d38493ea---96819432277.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/xegizobosibukaxemo.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.net/ckfinder/userfiles/files/faletofuza.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/28757996853.pdfIn PDF document text
    • http://phuquytravel.com/nguyenvanlinh/files/64941039235.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609ddc7e7d49c---kezifabemusurobuvefek.pdfIn PDF document text
    • http://dentherapia.hu/files/file/14187737468.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609022ca1cfa5---97422279401.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/ebd66446b3dd74a68c21d2e143d44fbb/69442545108.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/46586157716.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cab0966e622---70974285884.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/tits8b9u82jgoe7m512v7hh542/36943009972.pdfIn PDF document text
    • https://www.elitelawnsolutions.co.uk/wp-content/plugins/super-forms/uploads/php/files/skn7933hmfe5b8s9rbbihdgsdl/zimokuxafutesiwesorajiz.pdfIn PDF document text
    • http://gesgo.de/userfiles/file/15785261780.pdfIn PDF document text
    • http://bilafafafa.com/shopadmin/upload/files/30245855263.pdfIn PDF document text
    • http://bangdientunhk.com/upload/files/2214202666.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ba2ecc82918---59576597756.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/687291383.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/b7814f4dbccdbb9a8abadde9b5f6653d/bimasavagerajofok.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/36938864674.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/9346tb2ri6jmt66u0h7bsb85cb/96840434926.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=global+political+economy+theory+and+practice+pdfPDF 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_off00011707.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11707 17084 bytes
SHA-256: 240e540dea9b3f3f3b359ef46a7524f8528d801e9a3cf36ec7068ba6990308fa
font_01_sfnt_off0001438b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1438B 11008 bytes
SHA-256: a8d65db6cf9860b1ba686f77a3ddbfeeed4875edfd803c9efe35cc7d7e44f353
font_02_sfnt_off00015cbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CBD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1