Malicious PDF — malware analysis report

Static analysis result for SHA-256 776495b0267e526e…

MALICIOUS

PDF

99.2 KB Created: 2021-07-02 03:45:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: e9403b2571e51c4f40099f9c2ce3d209 SHA-1: ab5df58ffb1d97060b7241aad48e87545b4b4ae8 SHA-256: 776495b0267e526e72fab5d3aa175e4c389b4b0b4a2a1bebaf382015cb852125
156 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites, likely to host or redirect to malicious content. The PDF structure and the nature of the URLs suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9800

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://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082896804a1c---vuxudivizevevumoxubib.pdf In PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16081d778b8227---64824123204.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/2198d792e25585ba1b62e76362f97ca9/natejubemuxo.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/1ur1abd2qk53n15qkt02d1tcb2/63501469165.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bd2f6aab773---fovozitimisaba.pdfIn PDF document text
    • http://vaness-sens.fr/ckfinder/userfiles/files/kejefezubagevotamaratida.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160b80fe125a99---74737195257.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/tuvafatewid.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087bc6115444---2646968390.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160c8797b0cec9---podakomejebukuni.pdfIn PDF document text
    • http://vinmexindia.com/uploads/tebujekenigozejenewat.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/76076501064.pdfIn PDF document text
    • http://saxonsaxtonfamilyreunion.com/clients/f/f6/f6d0431f970e0833b0867c311dafb132/File/37134194291.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/ra9jr8e8doos6s0pk4t3jt8qsj/dogusosikadokunodobuna.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080de53b70d9---rajitotulixat.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/4ca5176a03ff72c57513a63ce5fe2f7a/93041074486.pdfIn PDF document text
    • http://podlahypilat.cz/admin/file/44046655227.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160acd152a246e---2820088699.pdfIn PDF document text
    • https://brahmagnanam.org/fck_uploads/file/gamofuvo.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/ihr9dlbg80mmlteem05pcse0hb/88130192911.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160874238990e7---19657296286.pdfIn PDF document text
    • http://velo.hu/UserFiles//file/milibexaponowefi.pdfIn PDF document text
    • https://pmms-online.com/assets/file/vigisonifeguzonov.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160be720c9b546---zutatozodizisozumirabef.pdfIn PDF document text
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0f71f378a---duvezonu.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba0dae2bd1---pamezusewa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=looks+like+a+triceratopsPDF 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_off00012311.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12311 17296 bytes
SHA-256: 432500fe83d066e9171f21c81e84ded80a635c2ec52c6610493093dd7f1ddafd
font_01_sfnt_off00014fef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FEF 10312 bytes
SHA-256: 907283dbe88ca67d8501397bf2b79595a234c30c4402c54b0e2265de1405616f
font_02_sfnt_off00016758.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16758 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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