Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ce6ea7fcd65eddd…

MALICIOUS

PDF

88.0 KB Created: 2021-09-02 09:19:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1b5445b50f45a03989a2410457d4e5e7 SHA-1: 9dcc7a1e52a3adfc02542ad4e2cd431232f23e0c SHA-256: 8ce6ea7fcd65eddd89733b16fa917be7f212fd1a1ef83f15e7508a655d23667e
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple links pointing to compromised WordPress upload directories, suggesting an attempt to host and distribute malicious files. The presence of a visual download button further supports a phishing or malware distribution lure. ClamAV detection as 'Pdf.Phishing.Trojan' reinforces the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa3dca354df---pevududasiwimurigemisawi.pdf In PDF document text
    • http://rszm88.com/upfolder/e/files/20210818041750.pdfIn PDF document text
    • http://mellorymotors.ru/admin/ckfinder/userfiles/files/dovesu.pdfIn PDF document text
    • https://cbdc.co/uploads/ckfinder/userfiles/files/79134497638.pdfIn PDF document text
    • http://hoanggiaphatland.com/uploads/image/files/sadobataxaximifazoriris.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/e6f356338516b810cba4e175936bc1b3/kevamukesijamuparukamok.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607305a51ab83---3147881207.pdfIn PDF document text
    • http://vipforiraq.com/userfiles/files/ruzukunawabumizas.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/3fac7591f0d85e0eb04ae08f4f8eb507/31765269350.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160a64b3ff3e36---44827664933.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/a16ae3248f701eda5ea629406de88695/tobavufetogujagabetinux.pdfIn PDF document text
    • http://www2.grupoksl.com.br/js/ckfinder/userfiles/files/90040484041.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acd52e583eb---babiwefinu.pdfIn PDF document text
    • http://funkyspa.net/ckfinder/userfiles/files/94042983104.pdfIn PDF document text
    • http://vtdsbinhthuan.vn/public/uploads/userfiles/file/bogaz.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a9035f83046---totokuwileratimilinovemem.pdfIn PDF document text
    • https://thefencedocumentary.com/adminfiles/file/kuxavofarudaza.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608d5d53a2f8a---33391575407.pdfIn PDF document text
    • https://jmcoverseaspvtltd.com/uploads/files/rebagom.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a182b885ed7---bavutu.pdfIn PDF document text
    • http://havefuntogether.com/image/upload/File/79495935912.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089e202e2715---vowepedazedujaxe.pdfIn PDF document text
    • http://ipayon.com/root/FCKeditor/file/faxetabavovirezezozipo.pdfIn PDF document text
    • http://chataphan.com/file_media/file_image/file/lamefagejer.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608601bf79349---wigoziguxoburajaxezixeda.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/4mfpm3hpmjfqb1lfu01tnvp5a2/nidofutonakel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=brecht+and+epic+theatrePDF 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_off0000f324.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF324 10328 bytes
SHA-256: c820490ee738709cea478aa0f94af398d7148dc427f0a6c8e411a94c3f81321c
font_01_sfnt_off00010a57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012269.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12269 17748 bytes
SHA-256: 5534e52c65e81c89ba591aa1604620cf5f557d4a7be135074f52ecb6049d6ab5

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