Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b69f54b17bfb3b8…

MALICIOUS

PDF

82.4 KB Created: 2021-09-17 16:34:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8e2c9f11b81fcd785a5e3b6f88f97ca1 SHA-1: da5871855a7b1521001f77bff67ecd7c8fc44fee SHA-256: 8b69f54b17bfb3b8b0575e82073b83a5c82410d23901791d50fe70a702b1b5f1
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document exhibits characteristics of a callback phishing or tech-support scam by luring the user to call a phone number. While no scripts were explicitly extracted, the presence of embedded URLs and the PDF structure suggest it may leverage external resources or exploit vulnerabilities to deliver its payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://archism.ru/uplcv?utm_term=principles+and+practice+of+physics+eric+mazur+solutions+pdf PDF link annotation
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/6560774249fad0fd96fa616258ae3a9d/59403579935.pdfIn PDF document text
    • http://tvoirostov.ru/ckfinder/userfiles/files/buzaxabelumuwojolalureba.pdfIn PDF document text
    • http://odontoflash.eu/userfiles/files/zujexe.pdfIn PDF document text
    • http://smolninskayahotel.com/userfiles/file/34417191528.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/25836602400.pdfIn PDF document text
    • https://indoshaolinkungfusociety.com/ckfinder/userfiles/files/10597058322.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/16133fecab2061---32563166854.pdfIn PDF document text
    • https://sudhirsachdevaclasses.com/ci/userfiles/files/zuloxoxikerefasozoxuno.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/13691058693.pdfIn PDF document text
    • http://gustosandvic.com/ckfinder/userfiles/files/fojemopixufelutiliri.pdfIn PDF document text
    • https://chief-moving.com/editor_upload/file/98408308800.pdfIn PDF document text
    • http://nesemlak.com/test/images/uploads/files/mukel.pdfIn PDF document text
    • https://carpenterstouchnj.supremeroi.com/FCKeditor/file/gorokusudaxakiwumi.pdfIn PDF document text
    • http://lagostena.it/userfiles/files/10611604602.pdfIn PDF document text
    • https://irrisyst.eu/files/file/4069458265.pdfIn PDF document text
    • http://telektrans.hu/editor_up/97811366086.pdfIn PDF document text
    • http://pn-tech.net/userData/board/file/44269541178.pdfIn PDF document text
    • http://administratieindex.nl/images/uploads/61825234155.pdfIn PDF document text
    • http://highlevel.pl/userfiles/file/zeruwofazafutij.pdfIn PDF document text
    • http://transcash.com/ci/userfiles/files/80396803789.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139f11139ca1---54553047011.pdfIn PDF document text
    • https://mauspro.net/upload/files/20426618329.pdfIn PDF document text
    • http://snabsz.ru/ckfinder/userfiles/files/wajininubipuzejevalevase.pdfIn PDF document text
    • 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_off0000d77c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD77C 11160 bytes
SHA-256: 0dc5fcd88676f4218543ee9a6431798b26a0fc35724a8578e474333ec9c98778
font_01_sfnt_off0000f169.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF169 19032 bytes
SHA-256: 9ea252f7a287f3a5a60fb5d7703bae8e139a2387cdf009cb7e373f7e88e043a6
font_02_sfnt_off000122c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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