Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1100e7d420f66c9…

MALICIOUS

PDF

83.8 KB Created: 2021-07-02 20:12:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: e0e2a4aa4cf0cf09362e47634318ef0a SHA-1: 0a68a6ffd9e3c4e98764f1ca0304fb9883b2b564 SHA-256: e1100e7d420f66c99ff9be070ed74a08f7768c2952bcc132d98b56f22bdf74a7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous embedded URLs pointing to compromised WordPress sites and disposable hosting. The primary purpose appears to be redirecting users to potentially malicious content, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16084ccde9d36c---85297545852.pdf In PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609772cea9e21---98707332978.pdfIn PDF document text
    • http://aerotechgroup.ru/img/outer/files/fezuxojokatajefo.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079ca67aaa30---tapiraga.pdfIn PDF document text
    • https://mm-podium.ro/userfiles/file/pigobitanuwozoralitilab.pdfIn PDF document text
    • http://dajuicebarus.com/uploads/files/vumeraxitinibozibogidu.pdfIn PDF document text
    • https://marjoyunlar.com/calisma2/files/uploads/28527384399.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/7qslseodqo2m3kjl58dj7hcqba/bovipegugarajoxogibupizi.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/fdd839f67d040fe230cde473a7f8d4fd/fikazolexaperiwil.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/5f504ce1482367a8b6b12b21fcb581cc/xuzekidosujodefa.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/xirejam.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dbfc46df43---54986716359.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/lezixoxupowo.pdfIn PDF document text
    • https://getracemirates.com/userfiles/files/40545086732.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160841b2fa29ab---kinozopasotuvabu.pdfIn PDF document text
    • https://west-holding.com/userfiles/file/rixutuvapit.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9ae76aba3---77433962956.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/vrcpje5qhht2n2ibloae89uqt0/82721739210.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/gbb6s1u8g5mlsms4gicl9m8ob2/6195559350.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160bc4966111d0---vebowaji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=ielts+reading+crop+growing+skyscrapers+answersPDF 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_off0000e44e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE44E 16800 bytes
SHA-256: 1d07cbfacc94b54e22019e0ea415068af871d7e5fad10bfacb4bb2b76dd48b14
font_01_sfnt_off00011070.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11070 10932 bytes
SHA-256: 03fb81df07c827d40ef5626ea8eaa11517f504366ccbce4ea66baa30a269c631
font_02_sfnt_off000129c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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