Malicious PDF — malware analysis report

Static analysis result for SHA-256 d467a76ee5bc9a4c…

MALICIOUS

PDF

85.8 KB Created: 2021-09-12 16:38:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9f87ae660a47c3a900a0efc93419d5da SHA-1: 9b731a1104894fd9fe71c5e3eb3f62f2d5b93a92 SHA-256: d467a76ee5bc9a4c9fe8465575647f7ce3d0c10fb499cccc30f15ac011455af0
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 websites or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://war-old.its.vn/new/userfiles/file/fubewavesazapa.pdf In PDF document text
    • https://lbk-ingatlan.hu/uploads/file/dozuwafinelojenir.pdfIn PDF document text
    • https://www.parquesanalbertohurtado.cl/ckfinder/userfiles/files/tupobefulifubon.pdfIn PDF document text
    • https://manenshop.com/upload/files/dinuluturagazedirazumaje.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff7d3e5a6b---ridusopo.pdfIn PDF document text
    • https://granitabrasive.hu/editor_up/24393956720.pdfIn PDF document text
    • https://copperscraphandlers.com/ckfinder/userfiles/files/3536671013.pdfIn PDF document text
    • https://artistprasanna.com/userfiles/file/dexabowiwuzunijimu.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/2316d4f06464801cba384eb44aa1ca79/68999795644.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/83625128094.pdfIn PDF document text
    • http://nrgmedia.hu/files/file/60068105246.pdfIn PDF document text
    • http://toyotacri.com/userfiles/files/25304014589.pdfIn PDF document text
    • http://kprmk.pl/userfiles/file/mudufori.pdfIn PDF document text
    • https://pierrelemagicien.com/userfiles/file/rofiz.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/69191a447c6e21a99e7ee6a6d8e7c1b7/goserituzox.pdfIn PDF document text
    • https://marathonblainville.com/userfiles/files/safakuwu.pdfIn PDF document text
    • https://baigiangtoanhoc.com/upload/files/vowugometezulavebibo.pdfIn PDF document text
    • https://merohamro.com/ckfinder/userfiles/files/96708209254.pdfIn PDF document text
    • http://craft-personal.de/userfiles/file/80343790583.pdfIn PDF document text
    • http://mn-lawfirm.com/box/userfiles/file/zobevum.pdfIn PDF document text
    • http://myphamlulanjina.com/upload/files/99651045659.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/f4c0add5368d42623b06755774cf1b7b/xiwol.pdfIn PDF document text
    • http://autavrabek.cz/obrazky/file/35116362807.pdfIn PDF document text
    • https://barcelona-health.com/files/galeria/files/zebimuduxiwemate.pdfIn PDF document text
    • https://hanoihome.net/img_duhoc/files/jeletan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=what+is+size+f+in+clothingPDF 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_off0000e901.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE901 18824 bytes
SHA-256: 63f58cdffc916160109128cf2b91884f1912c51a55d4d68449bbc6ab9069bbab
font_01_sfnt_off000119a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000131bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131BC 10568 bytes
SHA-256: 1e52533cf7bd2f50e39a49a8b9ba7f5a1ac157b144b21003fe1fce801e618fe2

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