Malicious PDF — malware analysis report

Static analysis result for SHA-256 508276d2fc9b9861…

MALICIOUS

PDF

90.1 KB Created: 2021-09-02 20:50:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3192d639a31f0283a2d96e290c907201 SHA-1: b9544537175e514924ac0463e470856e30b2cc34 SHA-256: 508276d2fc9b9861534f73bbdcbd769054907ca9ba1101a08c58ab8fad41b183
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://inwebjor.ru/uplcv?utm_term=yoho+band+3+manual PDF link annotation
    • http://doo-san.com/userfiles/file/20210511225427.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/23671cf706221056120e9111116bad2e/rivogazet.pdfIn PDF document text
    • http://fbchitchcock.org/clients/8/8b/8bdff38a390027835eb24981312b950c/File/27076371345.pdfIn PDF document text
    • https://assignmentmart.com/ckfinder/userfiles/files/dotorixawevukanibokedizo.pdfIn PDF document text
    • http://www.firengo.com/userfiles/files/kemoxikutixoteg.pdfIn PDF document text
    • http://energo-winstal.pl/userfiles/file/95236934936.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c6cb9c8ad7f---wofigekefozelaxope.pdfIn PDF document text
    • https://viettrungson.com/media/Files/nirelikotagarufenikosu.pdfIn PDF document text
    • http://china-engine.net/ckfinder/userfiles/files/bapedimogig.pdfIn PDF document text
    • http://tobn56.com/UpFiles/file/43227601612.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160723df997bd3---82321248413.pdfIn PDF document text
    • http://ih-consultant.com/ckfinder/userfiles/files/73839217624.pdfIn PDF document text
    • http://mazraeir.com/images/upload/files/gotowavoputodid.pdfIn PDF document text
    • http://em-mould.com/ckfinder/userfiles/files/kexadebigezewinoxot.pdfIn PDF document text
    • http://hyundaihungthinh.com/uploads/images/files/vegije.pdfIn PDF document text
    • https://editionsitaliques.com/userfiles/file/sufezufa.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/160d5132ae15f7---geper.pdfIn PDF document text
    • https://serviceservice.eu/userfiles/file/98038609981.pdfIn PDF document text
    • http://uniquecharacters.com/upload/files/13464808303.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/5c9691a463f739a0225fe27c41d2552d/16995177514.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f4c89d7bee---98054339975.pdfIn PDF document text
    • https://eastmanllc.com/ckfinder/userfiles/files/30781870181.pdfIn PDF document text
    • http://bahsclassof1965.com/clients/1/1d/1db829f64c2e26d3b32b12ccabba4d7c/File/5742386548.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_off0000f647.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF647 20276 bytes
SHA-256: 9c4ee5d3becd17e9f6ede8f7b2075f945c96e377be0558a760c45b8a9dfb3f95
font_01_sfnt_off00012bf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BF6 10316 bytes
SHA-256: d289532eda436db84a8d7c22a90264f20181d71c419bc64ea9b422f56096beb2
font_02_sfnt_off000142ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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