Malicious PDF — malware analysis report

Static analysis result for SHA-256 be55e60cc84ddd68…

MALICIOUS

PDF

88.8 KB Created: 2021-06-26 15:02:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4aa5f93e3fcf4a19868b839f371db24c SHA-1: 6b1c69b83bbe95e005841b93bab6966cb2eef7ac SHA-256: be55e60cc84ddd68c12a3e29e5581a7ffda74a816eeaacd7f0cc2ba07a3f501c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads, suggesting it's designed to host or redirect to malicious content. The embedded URLs, such as the one hosted on kystop.com, are likely part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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 https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/9f06a2f49a7fa9201c987521e04f2781/39738334618.pdf
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/relr144am38uibf0jnldtcnpk5/darafuzep.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b65922cd9---nuxosi.pdf
    • https://strategieb2b.com/userfiles/file/paditizujebedunikameto.pdf
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c42c39c019e---3870073793.pdf
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/j7ugqsj8raofeab0jpmame8g01/bupek.pdf
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/5k4o4f67g7ejs7peuq76kjr9mp/fopag.pdf
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8a8c77f622---serikabixobofubokip.pdf
    • https://www.bistro-e.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078797052c78---ruvewoputopodusimesoj.pdf
    • https://supermagnum-bg.com/userfiles/file/woxonuwegepetunifufenavu.pdf
    • http://laiyi-art.com/userfiles/file/59187843057.pdf
    • http://stroisvias.ru/userfiles/file/jirivinutejamaguweninado.pdf
    • http://e-pisanie-prac.pl/famprojekt_z_serwera/images/file/7623276532.pdf
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088a8994f1ef---fedolepumoxu.pdf
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/16071ce639c113---tujofilojuwojimide.pdf
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b4ab9e412d---56906486871.pdf
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160c609286a7c7---90812834906.pdf
    • http://ubest.ru/images/file/7912821031.pdf
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607cdcbd3445e---71546295810.pdf
    • http://mamnonlittlesun.com/upload/files/gudewexolotuza.pdf
    • https://ventadeterrenosurbanos.com/userfiles/file/86352874263.pdf
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c96366d62a3---17925895532.pdf
    • https://loctra.net/userfiles/file/rawetus.pdf
    • http://budohurtsa.pl/userfiles/file/penilowip.pdf
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c29de6b5501---98723246253.pdf
    • https://arch.ua/ckfinder/userfiles/files/35737671804.pdf
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16080436eb938d---zidukunekuj.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=network+security+paper+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f58b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF58B 16792 bytes
font_01_sfnt_off00010d9d.bin
5253049ebf78d369e8a48e7404175e56f852bb775670dab934486da974d8cb6d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D9D 17864 bytes
font_02_sfnt_off00013c7d.bin
dd1e6509939fc96b9a015d25bacf7d8872168c2c8d85b0d57232d218783138e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13C7D 10832 bytes

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