Malicious PDF — malware analysis report

Static analysis result for SHA-256 8706dbd2da001e82…

MALICIOUS

PDF

104.5 KB Created: 2021-09-03 13:01:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b997191a6800fc665501ec4d4b9f9002 SHA-1: df14dfa5e2ffdbfb7c5888ee71a73e795c047fa7 SHA-256: 8706dbd2da001e82f573b69b99ce4b28b73dd8f8bb68703a7cc18a2f305daddb
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to compromised WordPress upload directories and disposable hosting sites, suggesting it's part of a link farm designed to redirect users to malicious content. The 'SE_CALLBACK_LURE' heuristic indicates the document may also attempt to trick users into calling a phone number under the guise of a support or billing issue.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://dubilex.com/userfiles/files/80963518274.pdf In PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160c3357fed798---33616782616.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609256116a81d---zijisukowibotezesozevukix.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/16105b03e3a891---redinim.pdfIn PDF document text
    • http://w-w.cn/isee/pfm/cms/uploadfile/fck/file/79062487404.pdfIn PDF document text
    • http://uekekb.ru/!upload/files/noxeguzosatataxorek.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/zegawokazakerurokudelu.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16077a378279d4---ketovajanubolevitudile.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/xerujewajefes.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a37a1d1f700---konupamazafadu.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1608ddb8653745---tatadodezebowibejif.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/b697a6054be5f3f20c46f209a7b48ade/15032333788.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160801f8c4ea8a---829246639.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/572ae7d6e2eb36a65bc873c2798eca88/80815689757.pdfIn PDF document text
    • http://bluekeydigital.com/images/pic/file/rurujufujivowepoza.pdfIn PDF document text
    • https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/bh9jolbdrjtkd86os66n2fbg6r/kunofuguxutuxadijimene.pdfIn PDF document text
    • http://ergakiland.ru/files/files/48505145872.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f68a805667---wijupoxakewujumukuwuz.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/b2tgqc3eq0nl0g5l0te04tlvf1/ranofogam.pdfIn PDF document text
    • https://przygodanaukrainie.pl/admin/ckfinder/userfiles/files/99195547375.pdfIn PDF document text
    • http://alde-pace.org/ckfinder/userfiles/files/57810401127.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609c884d1151e---dasavovumeju.pdfIn PDF document text
    • http://topenglish.sk/app/webroot/gallery/files/wusewakenilevibe.pdfIn PDF document text
    • http://klawiatury-foliowe.pl/_data/file/rikim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=accomplishment+report+for+ojt+students+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_off000132e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132E4 18184 bytes
SHA-256: 2c13c95f71d13145d8aa0f9ab495326b72b9d014c008211c6fea7725044bef88
font_01_sfnt_off0001628a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1628A 10932 bytes
SHA-256: 1befd6efb20d32c3ba09135d371b5cfdfb5d785a08703f4399dc3de74f76bbca
font_02_sfnt_off00017b98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17B98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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