Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab2320ffd98a25ed…

MALICIOUS

PDF

83.1 KB Created: 2021-06-28 10:05:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 3d5d05e2e6be531222a85f03fc3fc002 SHA-1: 744b54d6971cf89bc1b6c52e74425e6aa82e6458 SHA-256: ab2320ffd98a25ed0c43830f2902810e72626c51d8e9a1f004bf5f783cf09f5d
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by both a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites. These links likely serve to distribute further malware or engage in phishing activities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://krippner-schroth.de/wp-content/plugins/formcraft/file-upload/server/content/files/16074a4fe462cc---94887996133.pdf In PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/a34cec04810190de3d755cef4b7ad6b0/51328596960.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/e95d9771e93cc897ce03cbc6d0036a4f/84209174036.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/fcb557f0967c15d4227b375c2a20a599/mefiwigegukakelibaribize.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e7042bdf9b---titajabixi.pdfIn PDF document text
    • http://mimarkamilozkartal.com/userfiles/files/gisebezije.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ecbf5e9dc---pofepetijeme.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160af88cdb9c66---6586774501.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/7c2f6728f7d8ab42637c525ab91474d3/21023272930.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/836cku2v1qa49lvn3vgjt3spp3/musonokekoloduxo.pdfIn PDF document text
    • https://wotfiles.com/ckfinder/userfiles/files/9554208122.pdfIn PDF document text
    • https://dprkoreatour.com/uploads/files/dubosugesepisamafip.pdfIn PDF document text
    • http://cosyromania.com/media/file/semexofabujamimukurifakij.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ae6dffbfc8d---bigudedotuselodoriw.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/pilinerasudezimumare.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/83766951926.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f345d8c7a2---30018173691.pdfIn PDF document text
    • https://datajournonepal.org/files/jilonosevajuses.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/48180684563.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/dakixosumibaz.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/9m9at78v4afk3e5q5a5s8k31oc/negam.pdfIn PDF document text
    • http://opusincertum.it/userfiles/files/dasilik.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/07b2a7c8463718b23172c3ab3c4ee5b3/revugopizazavewol.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/4192bde223ad91982979dba7bdfd1c79/dobapobikukaxavutinar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+find+range+of+a+radical+functionPDF 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_off0000de67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f67e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF67E 10660 bytes
SHA-256: a9d5b6f3dc06dad991e9e149ca5665750d2edca8964fee319dff55b9780628a8
font_02_sfnt_off00010ec9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EC9 17744 bytes
SHA-256: 9cd689f2061440df538b6e1fbf245b019549a91dc50e46b6fefecf77c403caa5

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