Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3f277be0bfb6037…

MALICIOUS

PDF

75.4 KB Created: 2021-09-04 14:50:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a4168f01a38a2b4607883a24a1523c8b SHA-1: fbe21d4eebe0724f69e1a94ec0083bb935db77cf SHA-256: d3f277be0bfb6037c699f4e02f4b2f96cf62b2c4c2ab84a4b1623eab1f1e5466
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to multiple distinct hosts, many of which are associated with compromised WordPress uploads. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The presence of a download button lure further supports a malicious workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://kystop.com/wp-content/plugins/super-forms/uploads/php/files/qf68u6ocesgcnndi6bk6sthv44/navogokisodiwutib.pdf In PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/94020907968add11a5ec9f6ddb298fee/tinixelabunoburimopu.pdfIn PDF document text
    • https://ksuskalology.com/images/file/69776138213.pdfIn PDF document text
    • https://drddvichitra.com/userfiles/file/lumedamejasexutufuwaxivan.pdfIn PDF document text
    • http://doyen.cc/images/upload/File/69650202290.pdfIn PDF document text
    • http://sedaciesupravy.sk/media/file/17616716470.pdfIn PDF document text
    • https://sts-cct.com/app/webroot/userfiles/files/87799986121.pdfIn PDF document text
    • http://garderoba.sk/images/_file/28987886775.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/31174729973.pdfIn PDF document text
    • http://thejosephinebryantfamily.com/clients/48776/File/bixenujomurinenisigo.pdfIn PDF document text
    • http://mcutech.net/upload/2021/06/file/1624539859441669640.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609b738a76513---jizubupu.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/d7fc4435384b01d14967c5c92877b9ad/viget.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/ce2ca3e812fde9cc162782660cfda909/13570030329.pdfIn PDF document text
    • http://nusratali.com/userfiles/files/gositukusowizitewix.pdfIn PDF document text
    • http://www.dean-cpa.com/files/adminpic/file/benoguvaguzogog.pdfIn PDF document text
    • http://stevis.cz/files/file/74575472218.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/3d0afa9804f5bf26aee79555ba003e18/dakodebovunisora.pdfIn PDF document text
    • http://erex.hu/upload/file/kedufafexatilavo.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c31e99f3591---likebepoxaxotupoz.pdfIn PDF document text
    • https://fwstc.in/userfiles/file/juwalanotised.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=atkins+physical+chemistry+10th+edition+solutions+manualPDF 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_off0000c0eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0EB 17020 bytes
SHA-256: 40724a9eb2b98b21b629ed4d48739c312c9d1ebba95098f7e353c644e8d7d579
font_01_sfnt_off0000ed29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010540.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10540 11240 bytes
SHA-256: 78b100a4046453debd4454d20b60355515329c07098655c5f69e62f65a150cb1

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