Malicious PDF — malware analysis report

Static analysis result for SHA-256 c79ad1b25c80c8b5…

MALICIOUS

PDF

87.2 KB Created: 2021-07-08 01:21:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 2db99e42bab16da6d7011b404e682a90 SHA-1: 36faf40e036d140a41a8bc364a5580f3c4a3845f SHA-256: c79ad1b25c80c8b59735d2760b0fac69f00190d88fe14bb9ddd4bc9dda864f17
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The embedded URLs and the PDF structure are consistent with techniques used to obscure malicious content and redirect victims.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://miaousland.fr/ckfinder/userfiles/files/55056369902.pdf In PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072a943926f9---piwogoteratirugezu.pdfIn PDF document text
    • http://megaprestige.ru/uploads/files/nibilapesatoxoxazimeret.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/p4vd3sk7u4nve6s41k2nkjit56/57307672210.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a928388537e---mijewajadekemijuvetuvi.pdfIn PDF document text
    • https://ssvacancy.com/ckfinder/userfiles/files/xobekaxurokuvavabosepo.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071025f2e55b---82067849991.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/goborexanedaselorexiko.pdfIn PDF document text
    • http://keletunderground.hu/images/uploaded_pics/file/kafabixaj.pdfIn PDF document text
    • http://stsaischoolamritsar.com/slbdavbatala/userfiles/file/badopuwivegupugasavizewo.pdfIn PDF document text
    • http://kinocosmik.ru/sadm_files/topokisuxi.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d17bc15fe---wemowovodogitexuvu.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/f71ed3679d4fff7680d1b2c1bf2a76cf/53290758810.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/62044621851.pdfIn PDF document text
    • http://illinoislivestock.org/userfiles/file/xegajotoraz.pdfIn PDF document text
    • https://cissud.com/uploads/ck_editor/files/49180564526.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/jqctn7njfkd8kn57d1n10ua1a2/lebavinuvorulevotiwiredi.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160835d80db4d6---gakibirisubilaju.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160877e7a2b652---bifazudebasanibigumap.pdfIn PDF document text
    • http://flambotour.it/themes/userfiles//files/47607391729.pdfIn PDF document text
    • http://fritz-fahrlaender.ch/download/peginofo.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/4bd1615058f6b2105b3a43e22c6dd545/9585592516.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=us+department+of+labor+jobless+claimsPDF 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_off0000f114.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF114 11056 bytes
SHA-256: 6254ac426f43d8b4af915bf74b0f527dc1417925358d0a75df0c7c2f1df4d4ef
font_01_sfnt_off00010a89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A89 17532 bytes
SHA-256: 60d711eafd4a159033b51dba5289a389015f9ab23c1d430c3a2d8660e9ca57b9
font_02_sfnt_off00013894.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13894 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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