Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ed0e306584666c9…

MALICIOUS

PDF

124.4 KB Created: 2021-09-07 02:16:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1951f8180ffc1203381680422759f421 SHA-1: 636d9cf67871611cac10c3c6e34a5828cf832552 SHA-256: 8ed0e306584666c908cee4e14f4d527045a59a574c13d358b0f4a6a0c541ed73
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm used for SEO manipulation or to host phishing content. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1607cbd7bdad1b---tisewopunevekanoxer.pdf In PDF document text
    • https://asken.as/bilder/file/43476032729.pdfIn PDF document text
    • https://www.multilandtours.com/assets/ckfinder/userfiles/files/42321513459.pdfIn PDF document text
    • https://coebmsf.com/userfiles/file/pulapamedis.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/a9ee93e1b9dc2e9c849a34dd9810f332/kobiso.pdfIn PDF document text
    • http://jtg-antracyt.pl/files/file/93320591367.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eea7fbf5db---lonolir.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4f45d13180---73970104976.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/9f30e5ced2f0bfb932309b7dfc0c23ef/sugenijitar.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/18886872588.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad160d8e3c6---kaxotufedebowofovid.pdfIn PDF document text
    • http://abwcockeysville.com/uploads/files/46354982820.pdfIn PDF document text
    • https://jucariicopilasi.ro/app/webroot/files/userfiles/files/bobenazerufebetader.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2e05cbcee---34723109700.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fbe7c228db---37343578242.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2b258731be---zorujujim.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606ea7c534fc3---95618043307.pdfIn PDF document text
    • http://sriagasthiyarastro.com/FCKeditor/userfiles/file/tobijixofimi.pdfIn PDF document text
    • http://hasici-pristroje-eshop.cz/files/file/vitibolokafojajebekuzalu.pdfIn PDF document text
    • http://xn--80ahcjevtqq.xn--p1ai/ckfinder/userfiles/files/18635337952.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c03e9a6ee48---sawavofesonidun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=shrimad+bhagwat+katha+in+marathi+pdf+free+downloadPDF 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_off000176f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x176F2 22520 bytes
SHA-256: 36b3519c5a8a24042147f45a11e43bb44950af1ce0d03b7628da24035a4e6a80
font_01_sfnt_off0001b1d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B1D4 11172 bytes
SHA-256: dcfebaad051e864263244f76a2926b07a228b1c18fa60a55fe3c9108e42af206
font_02_sfnt_off0001cb62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CB62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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