Malicious PDF — malware analysis report

Static analysis result for SHA-256 26ca291c5abc323e…

MALICIOUS

PDF

81.1 KB Created: 2021-09-17 15:28:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 164c3dd1a6cc1680aecd8673c90320f4 SHA-1: bf66bf059681f4307facafc986dccf3b0915861c SHA-256: 26ca291c5abc323ebf7211600df17292f3aeecd9b2b764b6b1a8771ee5bd1d24
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with multiple URLs pointing to potentially compromised or disposable hosting, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or delivering a trojan. Although no scripts were directly extracted, the PDF structure and URL patterns are consistent with attempts to trick users into downloading malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://cieplej.pl/imgturysta/file/64910960163.pdf In PDF document text
    • https://lorus.rs/files/14859494424.pdfIn PDF document text
    • http://georgewongdesign.com/gwd/upload/files/94894585474.pdfIn PDF document text
    • http://mgtofubbq.com/uploads/files/lusonororifewu.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/2lkc04a86bkhuouaib054bp63v/30951734240.pdfIn PDF document text
    • http://sieuthicayxanh.vn/webroot/img/files/vojuwakikarexulivapaj.pdfIn PDF document text
    • http://banhangcongnghe.com/upload/FCK/file/woxagetunabiko.pdfIn PDF document text
    • http://www.dreamstoreonline.es/ckfinder/userfiles/files/saxize.pdfIn PDF document text
    • http://cl-metalparts.com/d/files/47387832114.pdfIn PDF document text
    • http://hb-hospital.com/file_upload/fck_upfile/file/megute.pdfIn PDF document text
    • http://brette-animation.com/userfiles/file/kudilupaxopejotesab.pdfIn PDF document text
    • http://radyoislam.com/resimler/files/26263992981.pdfIn PDF document text
    • http://mirutte.com/newsfiles/files/32018758793.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c06983efd2---89815771916.pdfIn PDF document text
    • http://umhouses.com/uploads/files/kipajumogemomulalaref.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613f2c6c773a3---kavebabekobadagopikasera.pdfIn PDF document text
    • http://avrig35.ro/uploads/fck_editor/file/12083218908.pdfIn PDF document text
    • https://hotelreviewreserve.com/basefile/hotelreviewreservecom/files/84203898338.pdfIn PDF document text
    • http://ettorebelfioreliutaio.it/userfiles/files/49056142122.pdfIn PDF document text
    • https://tuinvandecruys.be/file/lojivumolisob.pdfIn PDF document text
    • http://locum-system.pl/userfiles/file/9077591161.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=cricket+19+game+download+for+android+apkPDF 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_off0000d86c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD86C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f083.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF083 11224 bytes
SHA-256: 3febe1b354d8cc6b85c5e36b89472de739977dd3ae0dda7972ff8b76d993dc89
font_02_sfnt_off00010ac4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC4 17208 bytes
SHA-256: 54723afc564f9bf06f089f9ad6089a82653c42993273877cca5fe9282244741d