Malicious PDF — malware analysis report

Static analysis result for SHA-256 703d2de5492fc8e6…

MALICIOUS

PDF

72.1 KB Created: 2021-09-03 00:26:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6b20989368d6d4d7ec1476005a35a76b SHA-1: 59fbac54c7345c8ecd1635d731b13e2baee02cef SHA-256: 703d2de5492fc8e66027bb354de210e85c3e12f2fee2957e907fb0d07e80a1c3
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress installations and disposable hosting domains, indicating a link farm designed to redirect users. ClamAV and ML classifiers flagged this file as malicious, specifically as a phishing trojan. The primary attack pattern involves luring users to click on these links, likely leading to further malicious content or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9902

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://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/f1fa09239dbf0f1b7b2b4493d63a037d/bimopo.pdf In PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609dd53c2c8da---rukabufupuxetetozagerut.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/fb931d2c4a0f9bd8a62b019795543bc6/dizijus.pdfIn PDF document text
    • http://angerdress.store/ckfinder/userfiles/files/96178499324.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/5a742606427a66a71c9bbd4c9508c48a/97771283560.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/1778614151.pdfIn PDF document text
    • http://upperdublin1970.com/clients/3/3b/3b2fb281f4756d03d37a29c41a8c1d95/File/roxasexodokefamad.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16128dfdf4afae---tudufevinimogupaxipe.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/1f32ad3e2749c1545e57c9c00a85e605/buximojujexinarazesug.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/55c54eae6e78b52bb4129617c3b7a8f0/gunaluzulabitisofujego.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/j40q6p0h9e8d0ljq7fvn2cn8st/vigesipolefewibunu.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609845aad04a0---88065482625.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/46546963069.pdfIn PDF document text
    • https://almuhja.ps/ckfinder/userfiles/files/92631340894.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/847598008831fd6a5e9703d2e5a549ed/mupop.pdfIn PDF document text
    • http://biomassasia.net/data_ed/userfiles/file/31220370711.pdfIn PDF document text
    • https://evergreencans.com/userfiles/file/33981052854.pdfIn PDF document text
    • http://hangnhatbanonline.com/upload/files/22440063438.pdfIn PDF document text
    • https://fereshtegan.net/basefile/fereshtegannet/files/70410871355.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e2117b26a6---voredakivokenidunapisofa.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/g39qta7gr8mj9o0mpsajt0mi86/55283030886.pdfIn PDF document text
    • https://muguet.fr/sites/default/files/file/tefebisupane.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/8ee44babaa2e5356644f000c74e38075/tajiletalalilonogon.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16084dd7a1d641---76624823072.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160938722363b3---rajotatopekajosoxegiziz.pdfIn PDF document text
    • http://wintec-samu.hu/uploads/files/vulepijidatumedotip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=arte+gotico+historia+pdfPDF 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_off0000b8f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d10c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD10C 10732 bytes
SHA-256: 2d04951e11eb0d745c381bbf601cec9f56d164778d730e60e3fdfa73d86e35b4
font_02_sfnt_off0000e9a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A8 16272 bytes
SHA-256: dd3f59f4c76cbfac8dc6b0975a3363888277cf9bcb0cbdad1c69b814779c6e82

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