Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9c37304cc744931…

MALICIOUS

PDF

88.9 KB Created: 2021-09-06 17:02:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2209a1c826cc81c5f799532377e340f3 SHA-1: 45b1094e527490eda5eb51cd84478bc6ced765c4 SHA-256: c9c37304cc74493113ddfaf5c2dbf76e1ea64ab7b92194043a22c46a10a182e5
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of links, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute malicious content or phish users. The presence of external URIs and compromised CMS upload links indicates a clear intent to redirect users to potentially harmful destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 6

  • 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.
  • 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://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b2d27be001d---papudolegonolaj.pdf In PDF document text
    • http://coimbrasoftware.hu/images/uploads/files/xexajusob.pdfIn PDF document text
    • http://vankouwenenmastop.nl/UserFiles/file/85279656717.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160afe815296d1---dejoximesigokitaweluf.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c96ef77c0d---wawisujenumirigosu.pdfIn PDF document text
    • http://shortguycentral.com/ck_uploads/files/tutotofobonukizedina.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16084f6711a9cf---67908288473.pdfIn PDF document text
    • http://lukasikgroup.pl/Image/files/zunikima.pdfIn PDF document text
    • http://hzkontejnery.cz/ckfinder/userfiles/files/11201908664.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610685ce428fb---motijudonafulerulesus.pdfIn PDF document text
    • http://cameradungphat.com/uploads/files/towaloge.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/58956957630.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/a30f2b84efd4e95db6919337e9d19338/kexapi.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16091d7af0bc6b---46339300757.pdfIn PDF document text
    • http://ilturismoinitalia.it/userfiles/files/26113433332.pdfIn PDF document text
    • http://indigobaby.eu/upload/files/senod.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16089ceb8e6c67---jafamureji.pdfIn PDF document text
    • http://3e3i.com/UserFiles/file///86676117541.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/91c4c658287ce2f9adc3976219d89cdc/lefip.pdfIn PDF document text
    • http://standdominica.org/files/files/nuwelobamowejod.pdfIn PDF document text
    • http://servicedental.it/userfiles/files/lamidoriruja.pdfIn PDF document text
    • http://paliukenas.lt/i/File/53196608501.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/16106e4aa9871a---visiledinegot.pdfIn PDF document text
    • http://holmeslawfirm-iowa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kepunosejotufe.pdfIn PDF document text
    • http://www.w.radeton.cz/ckfinder/userfiles/files/70158142079.pdfIn PDF document text
    • https://roomart.uz/ckfinder/userfiles/files/patosivod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=reduce+size+of+pdf+imagePDF 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_off0000f3c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C4 19248 bytes
SHA-256: 0a769ac4cf2f2f9ae5ba007a28f36f7e187fc5b0dded698b3db3951847dd9a79
font_01_sfnt_off0001253a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1253A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013d51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D51 10820 bytes
SHA-256: c7694a6daab1a18626a854bc4f5f330fe4fdca65ff76ba9eb3db122a0090450a

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