Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6c97c9c8295073b…

MALICIOUS

PDF

91.1 KB Created: 2021-06-27 03:16:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 203d80925181891db80179765899fa4e SHA-1: 041d1b3d5ca9349de1b5ad9f8113d6ca3e61fe6a SHA-256: a6c97c9c8295073be75982f28bfdd47c0d2a6be0b631863a319b17b28262f525
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, potentially leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://krisoc.ru/uplcv?utm_term=m+tech+in+computer+engineering
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b26cc5e1fda---dezudoramuxozotosukireko.pdf
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608d6629a9c41---33463407324.pdf
    • http://titadoorbinhduong.com/upload/files/61064839361.pdf
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/940e3a9958267ee7fe686067f9b18e31/niseditatoragowigapate.pdf
    • http://wooshin.kr/uploaded/file/214649331560a1773f34d7f.pdf
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/2a7756b92c913c7297385f5d5ad0868a/vizutimudejedad.pdf
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608aadcd231a3---sadoxegofonaxebuto.pdf
    • https://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/grc1vdk636d95kna1vvjulppjs/74868348831.pdf
    • http://ankurgroups.com/userfiles/file/84701007542.pdf
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/79b5555fcf75e2012731dc6236274d28/wusatuvuzom.pdf
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/30f63383533bbf713df743acce1d69c5/296219304.pdf
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/04b5cd264d4683c47bd0e4916a2818a4/xewonibeka.pdf
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160873481427ad---63034166032.pdf
    • http://ambulatorioveterinariopisillibertozzi.eu/userfiles/files/xewigawurirato.pdf
    • https://addsfly.com/userfiles/file/9944736869.pdf
    • http://bsp-plovdiv.org/ckfinder/userfiles/files/80792046665.pdf
    • https://pametnidom.hr/pametne_kuce/userfiles/file/ranagurodokazalerugomul.pdf
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d646fe9955---4469099523.pdf
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/nlui0o7g7j1jo044cish0ukv44/zozedawew.pdf
    • http://sapaethnic.com/webroot/img/files/xakivogo.pdf
    • http://swaminarayangm.org/userfiles/file/zuxoxadovapinigolam.pdf
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/bcj4qo1a8r8dv8ee5n71n27455/12008812155.pdf
    • http://anhuifan.com/upload_fck/file/2021-5-12/20210512154858659053.pdf
    • http://nage-z.com/ckfinder/userfiles/files/1717756947.pdf
    • http://sunnysolutions.it/uploads/assets/file/gazoji.pdf
    • https://activepymes.com/pub/file/tejakijasojetam.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_off000101dd.bin
1057c063e3f5beb192cf000919186f6ea49b350f5b1e3f7cd2c078b36e2e1897		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101DD 10536 bytes
font_01_sfnt_off000119a2.bin
f6133b37173b242bf7cec6cb30d82339cf9e1d8d7d2a6ce40a85be265c7a3af3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x119A2 17448 bytes
font_02_sfnt_off00014723.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14723 16792 bytes

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