Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ff3b0736406a64a…

MALICIOUS

PDF

71.9 KB Created: 2021-09-30 21:01:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 03a7f80fc4a92db00ecc4d8d82ec89eb SHA-1: 5515e6958e6c9f740baaa2897dff8f01bb6c5ff4 SHA-256: 6ff3b0736406a64a408ac5ef9374bfa0178c7fbed4737dd1fcd7741ec9b3d1e9
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites for further exploitation or phishing. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather as a container for the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://mayingiabao.com/upload/files/jemalizinezuxa.pdf
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614bb8a7e6b3e---romedatadodesibaxu.pdf
    • http://bud-drog.pl/userfiles/file/niwuzefepiviselumuwoboki.pdf
    • http://cpghollywood.com/userfiles/files/97113463473.pdf
    • http://12shio5.com/contents/files/38269538388.pdf
    • http://customize.fr/fckeditor/editor/filemanager/connectors/php/img/Editor/file/xugoligopabedep.pdf
    • http://sonsuadogo.org/Images_upload/files/musalanurewem.pdf
    • https://vilus.cz/userfiles/file/82302295823.pdf
    • https://goez1.com/10005001208290177/ckfinder/userfiles/files/nejuwokezigedesifovane.pdf
    • https://073741256.com/uploads/files/202109122222456354.pdf
    • http://thuduchouse.vn/pics/file/7294748652.pdf
    • https://nhahangbienhaitien.com/uploads/files/37400388409.pdf
    • http://ecovn.vn/uploads/news_file/disaxuko.pdf
    • http://www.tecnologycenter.com/admin/uploaded/fck/file/momajusavarofotub.pdf
    • http://stylekd.ru/files/55900945975.pdf
    • https://lochoanggia.com/upload/files/lodal.pdf
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/1b4a34b3ed8f298738cc7f6c283c6ff2/56355646076.pdf
    • http://asbazainville.org/userfiles/file/31579823530.pdf
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161301be528c93---48632489349.pdf
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/bonazakes.pdf
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f273805049---gupuzafajejadafudev.pdf
    • http://rotang.net/userfiles/file/jolanili.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=modis+global+land+cover
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b080.bin
614b24cbff64148ae0e0586e82bfd1a022a75807c585ca38589cae20e5461900		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB080 19524 bytes
font_01_sfnt_off0000e225.bin
01885f8251e46da87d3be5c74a5411a6715facea6908b9f21ec26d556caa1cdb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE225 10648 bytes
font_02_sfnt_off0000fa6b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA6B 16792 bytes

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