Malicious PDF — malware analysis report

Static analysis result for SHA-256 738787e9ad1e5585…

MALICIOUS

PDF

71.4 KB Created: 2021-09-19 06:15:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 71035674138296d163136cd12ddc3282 SHA-1: f2383ce2d522f326a1d49d48b8e7889006e425d4 SHA-256: 738787e9ad1e5585185323855e1b105743e519b80c644d6ba75bddfd239df547
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious content. ClamAV detection and ML classification strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

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 https://oniceh.ru/uplcv?utm_term=boruto+naruto+next+generations+gogoanime
    • https://almuhja.net/ckfinder/userfiles/files/tebidizofudejigitadufob.pdf
    • http://xn--5dbfbdrd7azav1bcx.com/sites/default/files/file/13950710971.pdf
    • http://henanshuangxin.com/d/files/lawejijisipopobokomu.pdf
    • http://talk200.com/admin/admin/uploadfiles/file/27656394632.pdf
    • http://www.prunay-en-yvelines.fr/ckfinder/userfiles/files/29179203442.pdf
    • http://ocung.net/img/files/30113939282.pdf
    • http://flashdisplay.net/UploadFiles/FCKeditor/20210907052704.pdf
    • https://franchise-vietnam.com/app/webroot/img/files/nuziforil.pdf
    • https://edinburghpools.com/contents/files/71463646725.pdf
    • http://grotech.in/userfiles/file/19268599931.pdf
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/bf20b25fb0b04befef6062602ef674f2/judulawefibebejod.pdf
    • http://tafgambiatours.com/userfiles/file/konuw.pdf
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c96efb9cbf---vijadozivegesudozevegozad.pdf
    • http://aadcnfgl.netsociality.com/upload/files/fosor.pdf
    • https://aymexco.ro/ckfinder/userfiles/files/nibewisibil.pdf
    • http://debrecen.varosom.hu/userfiles/files/4671195509.pdf
    • http://12shio5.com/contents/files/84030074968.pdf
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/bb4064313ac16c0d4f03b86037fa1a09/42004183020.pdf
    • https://mysilo.com/upload/ckfinder/files/dalemeteli.pdf
    • http://yogathoitrang.com/quangbasanpham/app/webroot/upload/image/files/67142282127.pdf
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613079b2aedbc---nemuxivabum.pdf
    • http://droneducational.com/admin/userfiles/file/33129748303.pdf
    • http://karate-talence.com/newsite/userfiles/files/kinanizelaninufovawu.pdf
    • 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_off0000b959.bin
ce742220b518baad04c1d317cef9555af99100981e6584bf95a397303eec4f05		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB959 15040 bytes
font_01_sfnt_off0000df69.bin
c4053626da49a0e7f082799f5008bad2bcd58c123b7d06211f16e433f21700ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF69 10660 bytes
font_02_sfnt_off0000f7e7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E7 16792 bytes

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