Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d1bd0085ff6f96a…

MALICIOUS

PDF

75.2 KB Created: 2021-09-05 11:57:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e2da0ac0c8465cb3bc610af18449a4c6 SHA-1: aa26a7eac79d773f3ffb8e574854ee4daee6c1af SHA-256: 1d1bd0085ff6f96a202b29e70f79e3667fa9958ea178ae428c7814539a117f36
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for Pdf.Phishing.Trojan, and an ML classifier indicating a high probability of maliciousness. The file contains numerous embedded URLs pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic further supports the lure-based attack pattern. Although no scripts were explicitly extracted, the nature of the URLs and the overall detection profile strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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.
  • 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 https://irlanc.ru/uplcv?utm_term=oral+anatomy+histology+and+embryology+pdf+free+download PDF link annotation
    • http://konditsionery-reutov.ru/upload_picture/file/86115346584.pdfIn PDF document text
    • http://open.ua/uploads/ckeditor/files/kilivefodedefori.pdfIn PDF document text
    • http://carrasvilla.es/uploads/files/sateselapomo.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/3f861be63b340fc405d953cd69fde788/pobabokurutej.pdfIn PDF document text
    • https://rumahbaruku.com/contents//files/sumamevinivijuxoboxekares.pdfIn PDF document text
    • http://movementlab.dk/userfiles/file/30527885308.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160865caf395b8---13065803417.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b00f222451---4070889612.pdfIn PDF document text
    • https://benhgout.net/uploads/Files/file/lemelagezidovekoteluva.pdfIn PDF document text
    • http://hzqzg.com/d/files/86897548039.pdfIn PDF document text
    • http://www.darvidproperty.com/news/file/bovanitaraxiva.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8b9g7peanetajfcd175hegvrg5/fobedijodowoluvuniwutili.pdfIn PDF document text
    • https://steammining.com/userfiles/file/6268646344.pdfIn PDF document text
    • https://www.latentoac.com/portal/wp-content/plugins/super-forms/uploads/php/files/ufkg0q0a84mfpnfveq07fnkpf0/molatazabitine.pdfIn PDF document text
    • https://www.rapn.ru/ckfinder/userfiles/files/wanamopidarura.pdfIn PDF document text
    • http://dancephoto.ru/userfiles/files/28703547185.pdfIn PDF document text
    • http://sro52.ru/uploads/files/27299839836.pdfIn PDF document text
    • http://hyundai-dongdo.vn/images/files/56447109167.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f81b79d58c8---tumelujajabaxosidopip.pdfIn PDF document text
    • http://huijingweb.com/upload_fck/file/2021-7-19/20210719182723440820.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_off0000be92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE92 11308 bytes
SHA-256: 15d20d6f9dfd88cda04205387efa8740963ac39641440f78665c942b376d9ab4
font_01_sfnt_off0000d89d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD89D 17856 bytes
SHA-256: 278778a286edc76eb40e28e9300ab03dbeb377cb46d08248310758ce75113335
font_02_sfnt_off000106c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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