Malicious PDF — malware analysis report

Static analysis result for SHA-256 21d9d6da6e9595cd…

MALICIOUS

PDF

85.8 KB Created: 2021-08-01 09:42:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b5601073a85110d08baf71d7a4e0db7a SHA-1: afdc2988089b659fa013106e2e8e62bd3bdaefb7 SHA-256: 21d9d6da6e9595cda81b726b5e8599dc682ed77db1bb0e73dd534104fb673867
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution intent. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites, likely serving as a distribution point for further malicious content. The presence of multiple links on disposable hosting and the use of UTM parameters suggest an attempt to obscure the true destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee7a0c7bc37---giparisovutome.pdf In PDF document text
    • http://jjmcp.jp/userfiles/Image/file/62916206438.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/c1a50e5da848f30fc0cc2049131a3365/vulilojuful.pdfIn PDF document text
    • https://wrd13.com/force/file/58122308543.pdfIn PDF document text
    • http://d4smontreal.com/clients/f/f5/f58105ca183540932673f5bf18e62671/File/70286402687.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6ecc875669---kamixirebakojudafowe.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/bbn7eug3tbdipdmt156l4cuchd/lurolava.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/minerelivewamidaled.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/3c320e790991c4d2342f7e91463c0978/2470286803.pdfIn PDF document text
    • http://zlato-invest.cz/upload/files/budesabidoxaga.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/0f0d2f28bab26e1970ba196a567661ba/titamig.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/72276c5c06e2a8593edb944e325d17f3/tufaxojozikogi.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e672e58075---mifipedonofuno.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073a09c5b39b---82517662870.pdfIn PDF document text
    • http://tizianaiberti.it/userfiles/files/lipimonutipelapew.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/jigogarur.pdfIn PDF document text
    • https://samtee.com/admin/images/file/wuduniwug.pdfIn PDF document text
    • https://implantologie-deva.ro/app/webroot/files/userfiles/files/rurenasesif.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/sideniretubesukapexebili.pdfIn PDF document text
    • http://fitviewer.biz/files/file/lufikajidixasusizoragusoz.pdfIn PDF document text
    • http://dyglas.com/userData/board/file/64026575101.pdfIn PDF document text
    • http://fedime.org/imagenes/giposugugujigowil.pdfIn PDF document text
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/1947857563.pdfIn PDF document text
    • http://bulgankhangai.mn/userfiles/files/10996804450.pdfIn PDF document text
    • http://sierrahighalumni.com/clients/878712/File/doxemoribog.pdfIn PDF document text
    • http://trendybiz.in/usersfiles/file/28871409038.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=sir+gawain+and+the+green+knight+pdf+answer+keyPDF 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_off0000edbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDBE 16044 bytes
SHA-256: 3fd4b3c3b78f2e1ae7c652c058d747d7f340ac563ce536e77d4968cae3180aad
font_01_sfnt_off0001171f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1171F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F36 10980 bytes
SHA-256: dcc7d42c274d82118db937aef4e8d66e3779a30d59c6ed3d6fc03292b1fded2c

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