Malicious PDF — malware analysis report

Static analysis result for SHA-256 729f581eb9a6e9a7…

MALICIOUS

PDF

79.0 KB Created: 2021-09-10 16:14:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8c662bf20408881118d413179e47368d SHA-1: 3fafdd47a206d780709c980cae938e0c9778a4b3 SHA-256: 729f581eb9a6e9a7e3f57d0f2bf514636cff5a5ca333246b7be8dd489d2eab7a
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to various domains, many of which are associated with compromised WordPress sites or disposable hosting. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a pattern of using these sites to host or redirect to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://smidgel.ru/uplcv?utm_term=the+hunter+3d+hunting+game+for+deer+%26+big+game PDF link annotation
    • https://thietbivesinhanhhuy.com/asset/files/55364353478.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/i1fjlpft2mapp28aim6j2oluan/73350293692.pdfIn PDF document text
    • http://nocleginaplus.pl/uploads/userfiles/files/dixizojonizusesabetibasa.pdfIn PDF document text
    • https://krassimirtaskov.com/userfiles/files/lakidi.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161305cac62729---kakivisitabulada.pdfIn PDF document text
    • http://hrjok.com/uploadfile/file/moliruradodovozik.pdfIn PDF document text
    • http://aktifithalat.com/resimlerfiles/77509691437.pdfIn PDF document text
    • http://snieznik.pl/userfiles/file/saduxom.pdfIn PDF document text
    • http://news-hk.net/uploadfile/file///73033960634.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16131e25ebf07b---35174124856.pdfIn PDF document text
    • http://bukharageorgia.com/sites/default/files/file/fepirelonatedejaxarixupor.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/sqvncqa7b81gr60lmo1nm5l7o8/7150599944.pdfIn PDF document text
    • https://solener.info/ckfinder/userfiles/files/16224008301.pdfIn PDF document text
    • http://alkanboya.com/files/file///vemowakiv.pdfIn PDF document text
    • https://chineseclothingonline.com/File/webomobuvali.pdfIn PDF document text
    • http://thietkewebbacninh.com/webroot/img/files/wowoze.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16132696384109---pekelotesisiwuzularinab.pdfIn PDF document text
    • http://www.jasolasia.com/image/upload/File/68588875031.pdfIn PDF document text
    • http://ficfart.org/userfiles/file/vemoxujadilaluso.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/be1142186ab07bf07dd16d84eba705be/56174899735.pdfIn PDF document text
    • http://cafehinglung.com/uploads/files/pelimugepidipiporimug.pdfIn PDF document text
    • https://alwaysthesame.pt/site/upload/file/54137227334.pdfIn PDF document text
    • https://nakatarikaszel.pl/app/webroot/userfiles/file/xugemumoxuxuxivimazuv.pdfIn PDF document text
    • https://tecnomatec.cl/upload/file/13384984901.pdfIn PDF document text
    • http://tootingtaxi.com/survey/userfiles/files/soxirupaz.pdfIn PDF document text
    • https://daotaolaixesontay.com/uploads/file/53189508169.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_off0000d07a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD07A 17072 bytes
SHA-256: fa160949b6e5e77462cfe02400f286c57b02e8677d0d622f4dd31e10f008630a
font_01_sfnt_off0000fd32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD32 10820 bytes
SHA-256: b74fdf2c058aeefbe6041cf5bb2aeee9a20f14ba7de46391cdf41184ecda506d
font_02_sfnt_off000115c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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