Malicious PDF — malware analysis report

Static analysis result for SHA-256 f36f64f32b94df6f…

MALICIOUS

PDF

84.4 KB Created: 2021-07-24 12:31:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 6db3793fcff421cb66bec49230b30f32 SHA-1: 8e8c348c5551d9457aee253417c4592d49c08f87 SHA-256: f36f64f32b94df6f402d9f24d890f6732dafa3835671a5aacc01e7e93b44f7d2
156 Risk Score

Malware Insights

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

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, suggesting a link farm or phishing lure. The PDF structure and link farm behavior are consistent with a phishing campaign or a downloader for further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://hillcresthigh1971.com/clients/9/9f/9fbf9047a6869172a982db6f42f05a9a/File/vanudewaw.pdf In PDF document text
    • http://szsahsh.com/uploads/files/1433758612.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/14087720408.pdfIn PDF document text
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/luratesis.pdfIn PDF document text
    • http://wedding-ideas.ru/ckfinder/userfiles/files/vidomelulesuxu.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160872a625d934---11325345832.pdfIn PDF document text
    • http://bjeclinic.com/ckfinder/userfiles/files/salowebizapebonagaxon.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce1f6d9ca1---mekusewalewuzaji.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ca16b96ed---19110252241.pdfIn PDF document text
    • https://paymentor.nl/uploads//file/denefaw.pdfIn PDF document text
    • http://cestovni-postylka.eu/userfiles/file/jimuxuvudevuziwanaw.pdfIn PDF document text
    • http://www.srijonihealinghome.com/fckimages/file/fusudoxenakuw.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/9f5c219aa049b30e634f8d3a2ecdf279/jotipek.pdfIn PDF document text
    • http://bygreenpure.com/userfiles/file/luxuwosudo.pdfIn PDF document text
    • https://x-software.cz/data/file/79471611033.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acf08481752---99973553221.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607255c20ec1a---77678101689.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/vizime.pdfIn PDF document text
    • https://booknowrentalimo.ch/userfiles/files/morafuzofa.pdfIn PDF document text
    • http://esejsc.com/upload/files/62743255412.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/weludadutawuwape.pdfIn PDF document text
    • http://hytechplus.com/userfiles/file/komuwevexe.pdfIn PDF document text
    • http://josephlillianmorrisfamily.com/clients/59960/File/87463378634.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=the+oz+principle+chapter+10+summaryPDF 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_off0000e3cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fbe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE6 11048 bytes
SHA-256: ed8e406561d55a60896485659e8f4132d322129d0f09f0fd8ba7ed8b6cd59b27
font_02_sfnt_off0001158d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1158D 17072 bytes
SHA-256: 386c47fe8158d64aaa0ce98925287e31739b726863cee0750f6ecbb1f57cc762

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