Malicious PDF — malware analysis report

Static analysis result for SHA-256 905fded4f9d02bf9…

MALICIOUS

PDF

86.6 KB Created: 2021-07-28 01:03:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d03dc428a951e7590682bcae3945ad15 SHA-1: 8bb643aa7e24bb8fbce7f587fde050c26e7ebbb6 SHA-256: 905fded4f9d02bf98e3801a66a6c9137be9f3a60c3ff98ff4accb682400db4be
184 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple links to external PDFs hosted on compromised websites, indicating a phishing or scam attempt. The 'SE_CALLBACK_LURE' heuristic strongly suggests the document is designed to trick the user into calling a fraudulent phone number, likely for a tech support scam or billing fraud. The ML classifier and ClamAV detection further confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/b463eef84987b736a95e52e4a793603d/weguwoverutofejifurumono.pdf In PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160754d7cf04ac---radagorixexotakuvumebok.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dd6db4e09fb---93488110645.pdfIn PDF document text
    • http://bakineshr.az/ckfinder/userfiles/files/xekorizajokijodazor.pdfIn PDF document text
    • http://cycling-software.com/files/file/fegemurez.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160713dfa50c7c---zasemubexomixagetaramo.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16087ecb511571---5372841693.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607f13e0040cf---38982253626.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c67bb439b48---25611083490.pdfIn PDF document text
    • https://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/af82aa16d1f225afe58dc378f16bd3e9/56693930379.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/0e0d2c9deb752be7ae6f8dc4dfdb1f5d/33977754956.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/af88bee7c90f0db23fd12d9457b92033/76365398838.pdfIn PDF document text
    • http://recko.ru/ckfinder/userfiles/files/popivalurisipivaxaze.pdfIn PDF document text
    • https://sanaspinler.com/calisma2/files/uploads/91931220967.pdfIn PDF document text
    • http://ahchala.com/img/file/59835056364.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091b6f4d0d7d---zipupuzosigaribim.pdfIn PDF document text
    • http://aven.su/userfiles/file/sinokewejozofimezazipoj.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021072420442776.pdfIn PDF document text
    • https://ta-taiwan.com/app/webroot/userfiles/files/56197159264.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/4jjgcqsrjt2pss4bh4gnnckro2/8230628238.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/9cd2051ca8a0a28ba8e985138b6ce897/5194224873.pdfIn PDF document text
    • http://mundori.com/js/ckfinder/userfiles/files/tigijaret.pdfIn PDF document text
    • https://a1-recruitment.fr/v2011/Files/fck_upload/file/46005626020.pdfIn PDF document text
    • https://prosaison.fr/userfiles/files/25602068851.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=who+is+simon+in+lord+of+the+flies+in+chapter+3PDF 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_off0000ef91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF91 11048 bytes
SHA-256: 992c2cfbd7708f15a436c816e4a065773e863e5ca7fd8d724202272dc4684c4a
font_01_sfnt_off0001091a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1091A 16664 bytes
SHA-256: 0210a876635be6035f2cccd8392dc3f47f233f14f77190cc2277838dc21b8053
font_02_sfnt_off000133fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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