Malicious PDF — malware analysis report

Static analysis result for SHA-256 deb14e4dbfcf947c…

MALICIOUS

PDF

72.1 KB Created: 2021-09-18 14:11:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f46d2aa366eeec833c3fa09a418f6e62 SHA-1: 0e71d9d41e6db4d1d294cbdf8a88eaa2c0f951b4 SHA-256: deb14e4dbfcf947ca444a4138c247f999e40d60ebf6e7fefbbf5b17dd382cb18
156 Risk Score

Malware Insights

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

The PDF file contains a link farm directing users to various external URLs, some of which are hosted on compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The presence of multiple external URIs and compromised CMS upload links suggests an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 6

  • 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.
  • 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://ketchas.ru/uplcv?utm_term=go+keyboard+pro+apk PDF link annotation
    • https://swiz.eu/files/editor/54993441525.pdfIn PDF document text
    • https://clarkfamilybuilders.com/home/clark/public_html/ckfinder/userfiles/files/52318052102.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613511829a9b7---17803267911.pdfIn PDF document text
    • https://uclerbaklava.com/resources/file/5940385629.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145a98d51739---wilazozeval.pdfIn PDF document text
    • https://agrocare.ro/ckfinder/userfiles/files/89177024117.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/e4550d8fdd634ae767b32d8b15d98a7c/timenomotubowezulorep.pdfIn PDF document text
    • https://virtualpulse.eu/UserFiles/file/momubedanoximumareguto.pdfIn PDF document text
    • http://kredoteka.ru/uploads/file/31111071103.pdfIn PDF document text
    • http://spartapr.com/images/upload/file/wovagobek.pdfIn PDF document text
    • https://valkexclusief.reviewz.eu/app/webroot/files/userfiles/files/turedejapufimabifaja.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/34580516595.pdfIn PDF document text
    • http://kientrucphatloc.com/upload/files/41111215817.pdfIn PDF document text
    • https://bczenekar.hu/files/file/5468635941.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fcde6553c9---sabulasig.pdfIn PDF document text
    • http://melabo.com/upload/files/2740703827.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16135d61d32752---fonokase.pdfIn PDF document text
    • http://studiogallerani.it/userfiles/files/27768803359.pdfIn PDF document text
    • https://pustelnik-budownictwo.pl/ckfinder/userfiles/files/68526709337.pdfIn PDF document text
    • http://www.medicellbank.com/userfiles/files/69848886641.pdfIn PDF document text
    • https://cancelaria.pl/galeria/file/fifidumekegi.pdfIn PDF document text
    • http://zhizhencn.com/filespath/files/20210910051902.pdfIn PDF document text
    • http://jl-vacuum.com/upload/files/motomibo.pdfIn PDF document text
    • https://bywuf.org/upload/editor/files/wakebifaselopemuposeraj.pdfIn PDF document text
    • https://hostsolutions.ro/app/webroot/files/userfiles/files/84245341170.pdfIn PDF document text
    • http://vako.vn/app/webroot/uploads/files/50585406921.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_off0000b94a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB94A 10264 bytes
SHA-256: 314926f19b678c616f9ed60a1b569ce9e94cbae6bbe1c3391dd4f265fcf7e4ea
font_01_sfnt_off0000d049.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD049 16520 bytes
SHA-256: e5c749ca59d0717cad1a2bc5f4331a58807bbfd511bb6077b59ffbfaf89dd4b0
font_02_sfnt_off0000fb25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB25 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1