Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee250e3268f1df52…

MALICIOUS

PDF

81.8 KB Created: 2021-09-05 13:02:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 01f72b053ca65548da0702926ee6288d SHA-1: d678d0eee87b76208618315da8e740cbd40335b4 SHA-256: ee250e3268f1df5208489ac74da04f7d7570a1e9e83757060acce138bccdb3f3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the presence of embedded URLs and the 'Fake invoice / payment lure' heuristic point towards a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://pistant.ru/uplcv?utm_term=convertir+xml+a+pdf+masivo+en+linea+gratis PDF link annotation
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607cafa74ac41---98845798200.pdfIn PDF document text
    • https://producedepot.us/userfiles/files/femujotatinotaka.pdfIn PDF document text
    • https://francoisdaulte.com/ckfinder/userfiles/files/88075818729.pdfIn PDF document text
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/4e45945c64f0e648fa98a392e30a867b/zusixidom.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a72db655fc---60072249503.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/88oatubgr2h5c0r19adr15d0l5/wepepilefesisuv.pdfIn PDF document text
    • http://w-w.cn/isee/pfm/cms/uploadfile/fck/file/xurusalisajuvulufobarufip.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/3cb7767a4f21f42b7980b45ebfe2d280/63450910763.pdfIn PDF document text
    • http://xtra360.net/campannas/file/50114943715.pdfIn PDF document text
    • http://tofuyatogo.com/uploads/files/zuzepuzil.pdfIn PDF document text
    • https://travelinnsuites.com/nbloom/fckuploads/file/sulubiru.pdfIn PDF document text
    • https://wegofa.com/userfiles/file/xuxoxafeluwe.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/ce3892e024b0d77e133cbd804f53d711/kenuduxorixadumajiferital.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/b6fc0ed92b2210d29c17b1491bbf1a2d/sonofigixidu.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608a7cefb1c7d---wegisapomebetedapelenefag.pdfIn PDF document text
    • https://nergizleryapi.com/image/files/15980618610.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/58027461781.pdfIn PDF document text
    • http://bomtvplus.com/data/board/file/20210604150927.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/vaminemeruxota.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a6421af21c8---bepefokegagotar.pdfIn PDF document text
    • https://hotelgaric.com/upload/datoteke/febibiz.pdfIn PDF document text
    • http://labotinnghia.com/img/files/suvuwirulirifux.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/xefesulobejuboxekujufom.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_off0000da2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f246.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF246 11040 bytes
SHA-256: 0173ed71d6c72248dc6d632a0f724948ae6e288d92fdc08249f4db49093b53ce
font_02_sfnt_off00010bd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD0 17564 bytes
SHA-256: 3410f99a60f2c182154ab1f363c9ea1efb08986540c9691246373cb31fe2b810

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