Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dd74d2fbb05fb2a…

MALICIOUS

PDF

82.0 KB Created: 2021-09-08 16:51:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 81b4f4c27adc41f6917cf460d5474d3b SHA-1: d3a02a9698661b5b6c3fe50cfa1636e39dba954c SHA-256: 5dd74d2fbb05fb2a80c2e0fc729f4433d4a4bfd03f2df4246c033d929fc50b8e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, many of which point to other PDFs hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to download further malicious content or engage in phishing. The file's structure as a link farm suggests it's part of a larger phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://vkts.se/userfiles/file/pedixopisofejoj.pdf In PDF document text
    • http://poliinc.com/upload/files/zuxof.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/161307004e7bd8---mawobapuperol.pdfIn PDF document text
    • http://retailcop.ca/files/82671971358.pdfIn PDF document text
    • https://www.bevillelecomte.ovh/ckfinder/userfiles/files/66757118539.pdfIn PDF document text
    • https://mobspace.xyz/web/img/podborky/files/26825308819.pdfIn PDF document text
    • http://muaah.ca/userfiles/files/fifurax.pdfIn PDF document text
    • http://duda-tech.pl/dudatech/upload/file/nunedumalipolufanevi.pdfIn PDF document text
    • http://cupta.org/userfiles/files/20210905011227.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/kumipisututemudaxu.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/70147913828.pdfIn PDF document text
    • http://fmafirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/85284953616.pdfIn PDF document text
    • https://emons-verlag.com/testarea/cwsCMSlight/media/files/66735533268.pdfIn PDF document text
    • http://salt17.com/userfiles/files/233870759.pdfIn PDF document text
    • http://plaschke-partner.com/uploaded/file/7977283879.pdfIn PDF document text
    • http://fapannimario.it/userfiles/files/janidibamedijipunoji.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/1df377b95508fafba2575a402ab90768/13781437354.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613067cbbf610---rogonegusima.pdfIn PDF document text
    • https://ylwlgwadmin.ylwl.cn/upload/files/87416153089.pdfIn PDF document text
    • http://wakesup.org/userfiles/file/wuvilaxuzugipeduwexa.pdfIn PDF document text
    • http://myshiou.com/uploads/files/202109041951189379.pdfIn PDF document text
    • https://ventsistem-bg.com/userfiles/file/jonixosufiwi.pdfIn PDF document text
    • http://musicandyouapp.com/webupload/editorimg/files/bimupirugelirijupowusig.pdfIn PDF document text
    • http://fipjp.com/userfiles/file/61199080322.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=r%C3%A9unir+deux+documents+pdf+en+un+seulPDF 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_off0000d4b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4B1 11020 bytes
SHA-256: 960cf9a5e7761de38640dc51a3be5b53735367a24c9c8cce524be8ab007a96e8
font_01_sfnt_off0000ee09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE09 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001061b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1061B 19720 bytes
SHA-256: f58b369ca7dea75a470031871984d1749f57a34368117073b2e15605c09ea6bf

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