Malicious PDF — malware analysis report

Static analysis result for SHA-256 adb73ac2c0a50033…

MALICIOUS

PDF

80.7 KB Created: 2021-09-07 13:11:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e9e579195a83978ed09e667ed930f907 SHA-1: e97cc09de97392f454e274f9d1bc83c7edbf44e7 SHA-256: adb73ac2c0a500330bd10e9ec6eddde79f9d319e7bc875867def18f1e0c8d666
176 Risk Score

Malware Insights

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

The sample is a PDF document that functions as a link farm, directing users to various potentially malicious PDF files hosted on compromised websites. The heuristic 'SE_CALLBACK_LURE' indicates the document likely attempts to trick users into calling a phone number for fake support or billing issues. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or a trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d6b1ed142---99757006681.pdf In PDF document text
    • http://koryosushi.com/uploads/files/goradanidow.pdfIn PDF document text
    • https://accounting789.com/ThImg/file/mibofidelumedexitudizigag.pdfIn PDF document text
    • http://catgarner.com/clients/873270/File/20440570434.pdfIn PDF document text
    • https://oriental-kitchens.com/userfiles/files/dubelagala.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099cdcd53e9e---42848437096.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca2a9c46d5---94305422585.pdfIn PDF document text
    • http://irishheritagesociety.net/clients/7/7f/7f3653e4c5d791bf76f28d2bf9929747/File/27656616295.pdfIn PDF document text
    • http://myblindz.com/fck_user_files/file/besinamisotomurikajonadud.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/aa53de60ba998d65c92041a24c7bdfae/vazebakapa.pdfIn PDF document text
    • https://ngonluathan.vn/images/ckeditor/files/pomokupowasikifoxone.pdfIn PDF document text
    • https://bhandarisurgical.com/ckfinder/userfiles/files/lipudakuxusi.pdfIn PDF document text
    • http://hydrogears.com/survey/userfiles/files/tosiwelatupaso.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/1610cff3f46c07---bevijutisivadifexom.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/kukilir.pdfIn PDF document text
    • https://hsse.cl/files/luturodedusogowevepigeve.pdfIn PDF document text
    • http://ultraljud.nu/bild/files/juzotewofe.pdfIn PDF document text
    • https://stvorki.ru/files/file/40273565155.pdfIn PDF document text
    • https://immobilgold.com/file/lival.pdfIn PDF document text
    • http://edwardlankin.com/clients/86087/File/54734041946.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/47461778525.pdfIn PDF document text
    • https://brs.jo/userfiles/files/niwekakazo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=free+download+software+pdf+to+word+converter+onlinePDF 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_off0000d52b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD52B 17836 bytes
SHA-256: 5c8cb433a84ad549b85a14ede3e50c7e588e6243c6f6bd2789c2d7b7bea1d646
font_01_sfnt_off0001040c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1040C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C23 10744 bytes
SHA-256: 024909cb5723050f76afcf7011a736275cc5dbc50cc9f2bee9216d968cfe136f

Open this report in the interactive analyzer, or submit your own file for analysis.