Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6a034aafcdc61c1…

MALICIOUS

PDF

81.7 KB Created: 2021-09-14 07:00:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0d7c3cba597e8355e8f0fb214ef9ca6b SHA-1: ec11e12f9372eabf891bb4c2543e8aa5302d5d8c SHA-256: e6a034aafcdc61c1821495a05c352f1433364baa9579f471d7edba185a2116da
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress sites, suggesting it's used to host or distribute malicious content. The 'SE_CALLBACK_LURE' heuristic strongly suggests the document's content is designed to trick users into calling a phone number for fraudulent purposes, consistent with callback phishing or tech support scams.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161385c1505c00---83818993838.pdf In PDF document text
    • http://erago.cidees.com/uploads/files/75332204622.pdfIn PDF document text
    • http://moutierrozeille.fr/userfiles/file/99943699107.pdfIn PDF document text
    • http://onlinemidias.com/ckfinder/userfiles/files/zisinufuv.pdfIn PDF document text
    • http://narnivet.com/userfiles/files/89457882732.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16134b7f8e5f0e---jesupowemib.pdfIn PDF document text
    • https://www.huaikrachaohospital.go.th/assets/global/lib/ckfinder/userfiles/files/58073327381.pdfIn PDF document text
    • https://kp-bs.ru/upload/files/tefopabotokukamosijudi.pdfIn PDF document text
    • http://4x4autok.hu/userfiles/files/87488027018.pdfIn PDF document text
    • http://galantemontagnana.it/ckfinder/userfiles/files/55741219237.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131f595ea14f---goful.pdfIn PDF document text
    • http://fszhenjia.com/upfolder/e/files/20210908212904.pdfIn PDF document text
    • http://debandhelder.nl/ckfinder/userfiles/files/tuzijabojezizipoxufujage.pdfIn PDF document text
    • http://matchedtubes.de/userfiles/file/64562908171.pdfIn PDF document text
    • https://karlschool.org/uploads/files/202109122245126378.pdfIn PDF document text
    • https://jogamiskolc.hu/ckfinder/userfiles/files/gesoven.pdfIn PDF document text
    • http://cayxaotamphan.net/userfiles/image/file/61312611425.pdfIn PDF document text
    • https://tskrea.com/userfiles/file/6869450359.pdfIn PDF document text
    • https://nutritie-metabolism-sanatate.ro/app/webroot/files/userfiles/files/99809403590.pdfIn PDF document text
    • http://express-service-auto.fr/ckeditor/ckfinder/userfiles/files/fulobizerisotixagijusu.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/o9evqsi7qkk7cc24iss1k5l9d1/31584619693.pdfIn PDF document text
    • https://btegypt.com/file/54678343535.pdfIn PDF document text
    • https://ruiguoex.com/upfile/files/2021/09/03/kosukobobiw.pdfIn PDF document text
    • http://kerekesvillszer.hu/UserFiles/file/duzajarupimemubexirezopog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=mobile+banking+rooted+devicePDF 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_off0000d9cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E3 10668 bytes
SHA-256: 0fd9a9245c6196311066dfbb2d139724e4dde44102e2bbe4e19337372a32f711
font_02_sfnt_off00010a3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A3F 18240 bytes
SHA-256: b64ce3e2ff8a1453d6b63dfd711c85b6b669f5a75e948c7f61c8115209110513

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