Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f332a28dc78ca3f…

MALICIOUS

PDF

115.4 KB Created: 2021-08-03 13:21:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 73b67feae8c8f2d1a75d8cd49b383091 SHA-1: d3c9f438bbfacb1839dd6148c84d0f42cf2235be SHA-256: 7f332a28dc78ca3f29abab64b43897cf4eafcb037aba557f5274f62ba0e902eb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://coretry.ru/uplcv?utm_term=systems+of+linear+equations+word+problems+pdf PDF link annotation
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/tme7s0us5hk70407evjvgi7t95/47706665164.pdfIn PDF document text
    • http://www.cddfct.com/up_files/file/76800787936.pdfIn PDF document text
    • http://izdepskifamily.com/clients/1/1a/1adacdf247316bc4617b3617d965acc7/File/zotob.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607b8bebe5b85---wugosijejatig.pdfIn PDF document text
    • http://nuitsdartistes.eu/images/file/kobigu.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607baaf43555b---dosajejelanikofinedijade.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/7938783066.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/f8ff63c17a5442a64ac57c3bb580d5b2/42227460367.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/jebubalaromiduko.pdfIn PDF document text
    • http://gardenofsound.com/userfiles/files/piwunexuvufifeduxik.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160889b582431d---56526539482.pdfIn PDF document text
    • http://suamayin.biz/userfiles/file/javeromirupepi.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/982ea5446a9b77170dfceb7f0ef2002a/rinemurakifudamakise.pdfIn PDF document text
    • http://falconartistmanagement.com/ckfinder/userfiles/files/sanejuserajurus.pdfIn PDF document text
    • http://ronniejoymemorialfund.com/clients/1/1a/1a75100f29d804137a154ca93ef51a80/File/wukosasojowi.pdfIn PDF document text
    • http://resortcrimea.com/ckfinder/userfiles/files/41679461845.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/fefusetubaj.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/54b63450d446849e0859938093ee152b/titodex.pdfIn PDF document text
    • https://arhstroi.by/uploads/files/22357831083.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160864bffc7802---74777407944.pdfIn PDF document text
    • http://klimagra.pl/images/wysiwyg_img/file/64778174883.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160aa907eb4707---5044908852.pdfIn PDF document text
    • http://arenabilardo.com/data/_files/91818632423.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/0bdc42e4498883df4bb5aad77523ed49/garetuxofurulaxuf.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_off00015c12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C12 18260 bytes
SHA-256: 516ed02c34103054e812650a0551ef52b458524165591b291d96d95d55970861
font_01_sfnt_off00018c7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18C7F 11320 bytes
SHA-256: c79cb58d94cf7393c00196806a3cf77b90411a0c3f919ff0e6221feb00c6c877
font_02_sfnt_off0001a6b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A6B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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