Malicious PDF — malware analysis report

Static analysis result for SHA-256 2aa8c06daf26af3a…

MALICIOUS

PDF

74.6 KB Created: 2021-10-02 12:46:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 088edc1cf2c83e51ff7b23dc09b76835 SHA-1: f1781311ebf38af2acaa0d93bcfb09817d7debe2 SHA-256: 2aa8c06daf26af3af035a819cc4694040896cec49dda6b49e3f7762587a492a6
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, which in turn host other malicious PDFs. This suggests a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, with the primary goal being to redirect users to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://inprovitcolombia.com/ckfinder/userfiles/files/defimijewu.pdf In PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/ba29f12fcc5f04324887ecd5570ea233/naxowolo.pdfIn PDF document text
    • http://aimecostruzioni.it/userfiles/files/77605771195.pdfIn PDF document text
    • http://naturenhuman.com/app/webroot/userfiles/file/rejotetokawexezunedez.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/4ddf880027106953c8e634e3c83b6b0c/lisamowadifigima.pdfIn PDF document text
    • http://jjkxmy.com/upload/files/202109301950548213.pdfIn PDF document text
    • https://rotitelor.com/contents/files/54232609356.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16131257581b77---puvoperoxuwotadikomew.pdfIn PDF document text
    • http://amunt.madteam.net/ckfinder/userfiles/files/80053959815.pdfIn PDF document text
    • https://monamifrance.com/FileData/ckfinder/files/20211002_D1956C14D65681EF.pdfIn PDF document text
    • http://harnettcountyhba.com/userfiles/file/79028074852.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff9f962e50---bowinexes.pdfIn PDF document text
    • https://abbma.in/admin/uploads/file/18368408159.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1615626e0548cc---48173736322.pdfIn PDF document text
    • http://levne-pohary.cz/UserFiles/File/wesur.pdfIn PDF document text
    • https://saleskerala.com/ckfinder/userfiles/files/xenevuvupemoxini.pdfIn PDF document text
    • http://wernersuarez.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/76000271464.pdfIn PDF document text
    • http://www.kigimex.com.vn/ckfinder/userfiles/files/xetimugawepagopu.pdfIn PDF document text
    • https://chiataiec.com/userfiles/Proj_Name/files/vuzanemujakagulevivox.pdfIn PDF document text
    • http://talani.nl/userfiles/image/file/38473512416.pdfIn PDF document text
    • http://christmaslandint.com/userfiles/61809322624.pdfIn PDF document text
    • http://bojovesporty.cz/userfiles/file/gekavum.pdfIn PDF document text
    • http://mirsistem.com/depo/sayfaresim/file/47544673841.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=simile+of+the+divided+linePDF 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_off0000bc58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC58 10332 bytes
SHA-256: 369cb5f56e9f2ae34cef463a5677d4a4f1552c77b79a8dc8f35c8cc65b71efc9
font_01_sfnt_off0000d36c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD36C 19316 bytes
SHA-256: c3639a6de2e96d27b49295f80e33f26e688f7e84a473e84802d9c30236f724e6
font_02_sfnt_off00010508.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10508 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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