Malicious PDF — malware analysis report

Static analysis result for SHA-256 962c39e6fc42750c…

MALICIOUS

PDF

75.3 KB Created: 2021-09-04 18:01:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 5f03f98d78d301509a316da9f2d55abc SHA-1: 243f58c01ceb470ad9987858ebb7765e803c052b SHA-256: 962c39e6fc42750c1a50c84efc9b7aafe057f815868157b1b34bb33bea87b02b
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users. The primary attack pattern appears to be directing users to external, potentially malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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 http://kapelski.pl/userfiles/file/jafoxod.pdf In PDF document text
    • http://bulmarconsult.com/files/56595499304.pdfIn PDF document text
    • http://jedwines.com/cmsCart//upload/file/11857171343.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/5bab84dc1b7796fc2150d44eeb2600fa/nobiwezolelo.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160ad0f043a607---danunoxom.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/461b26238d1600952f7195bc2e15f18a/kuxizasuzonujoxuziwadipen.pdfIn PDF document text
    • http://hibertek.com/image/files/20210629_083135.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/pavorarejinekuzade.pdfIn PDF document text
    • http://headlinesdinerla.com/uploads/files/forikuj.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/43221243694.pdfIn PDF document text
    • https://globalmediaminds.com/uploads/files/28270186376.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/wotufefew.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcd54f76997---xugumorobigi.pdfIn PDF document text
    • https://haltia.mx/sii/ckfinder/userfiles/files/finegifemasew.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/nigam.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e224b4be5ee---binewizimavoza.pdfIn PDF document text
    • http://airelimpio.mx/img/editor/file/nazubisuxo.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/3cbfc3e7d5312aeaf0ffb7acae6aa695/79511279974.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/0j7o97otj6tde3enrmt8k5kl93/87373833449.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/xexamaxurukaroberinidum.pdfIn PDF document text
    • https://airflow-skateboards.com/userfiles/files/suvonofelipokidovokageve.pdfIn PDF document text
    • http://karmand24.ir/basefile/ehotel724ir/files/10769724251.pdfIn PDF document text
    • https://hoalavender.net/upload/files/golefa.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/1ac1bb9b842cf5c282d27e9f7ac45bc8/votareg.pdfIn PDF document text
    • https://ijmscr.com/ckfinder/userfiles/files/koxatanebonetosozojudopa.pdfIn PDF document text
    • https://adikkeempat.com/contents//files/63466806242.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=vitamin+dan+fungsinya+pdfPDF 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_off0000c5ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5EF 16092 bytes
SHA-256: 6235ca71fb07550138e9f85d311d441e6aa6696fb6bb9200fe9948ac8d2a769e
font_01_sfnt_off0000ef28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF28 10624 bytes
SHA-256: ac659b743d8b3e218c669278a6281027a9cc8252502f7238f0a56e4a6135ba0d
font_02_sfnt_off00010741.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10741 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1