Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f390d49521b0c43…

MALICIOUS

PDF

95.7 KB Created: 2021-07-25 15:02:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c9f169c825856b8240e7f9730a8e4ae3 SHA-1: a5b03b3dec0417badb0cc9dc5f1dc6f427c8cdc0 SHA-256: 9f390d49521b0c431a2f6ee4dca3fb4f96f5133aeb862b50686f5ab780571041
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to distribute malicious content. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan, supporting the assessment of a malicious link distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 http://safeabortionnepal.com/userfiles/file/xoribasom.pdf In PDF document text
    • http://fashioneducation.ru/userfiles/file/34435401596.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2a7597ce47dbfe96086d4f46c573ddbd/wiwopiwumenozepowalos.pdfIn PDF document text
    • https://presstone.hu/userfiles/file/83808546295.pdfIn PDF document text
    • https://ikuseikyokai.jp/ckmedia//files/kowafilajawuloze.pdfIn PDF document text
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/6820d0bb8e229a3ec477488daeff054a/jubosar.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080d9d9d0496---naputidavewuritimozonum.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/fanogajelaxokejipomow.pdfIn PDF document text
    • http://trustycctv.com/ckfinder/userfiles/files/27775778613.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/ba317dbc8e70cee6244256d7680a682e/45064632034.pdfIn PDF document text
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/42f4eb9bc458fc7a8bd74d8cfda9047f/madepigasuzusediwasuzesuw.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/vasetu.pdfIn PDF document text
    • http://chupanhnoithat.vn/upload/files/9559436747.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088e8820824a---31909022239.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aac6334c3c5---puvebamotuduvupabovo.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/2e8bbf41fb7d57daeff8cde2f55a7767/28743685066.pdfIn PDF document text
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/5bc57e3b97fb1e5d4b299f57c7c2a31e/98156139206.pdfIn PDF document text
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079df8f3bfa6---50447139504.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/58dbf19cc21f6d797a7135caf6a9b0a9/39098149423.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/69ddb0ca7a7793d75f89e584fc50fd7b/jutul.pdfIn PDF document text
    • https://ntiverification.com/userfiles/file/kejituvuwopefu.pdfIn PDF document text
    • http://helderlive.nl/ckfinder/userfiles/files/71914702269.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=clave+de+activaci%C3%B3n+movavi+video+editor+15+plus+gratisPDF 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_off00010d3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001254f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1254F 17460 bytes
SHA-256: 794a442943863a4b617b4e19fb57415a50b7ada564a31a1ba5920b94981558bb
font_02_sfnt_off00015350.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15350 11380 bytes
SHA-256: 3b923e221c2220f4dc8838119b9cd97db6e55b6ac2d28c3456660486a588dfae

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