Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0ed4430d48edef8…

MALICIOUS

PDF

92.3 KB Created: 2021-09-04 10:02:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 66d3b5b054c08aca41f62e7a23abb49b SHA-1: f630388c9c70fd0f0f0d1c123b9358881de8abec SHA-256: f0ed4430d48edef8271e499e51844af49b5cda1fc01516a5b5441dbfb9020fda
192 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, which is often used to exploit vulnerabilities or download additional malicious content. The presence of a download button lure and callback phishing pretext, combined with numerous links to potentially compromised hosting, strongly suggests a phishing or scam attempt designed to trick the user into executing a malicious payload. The ML classifier and ClamAV detection further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

Heuristics 9

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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 https://xn--80aaa1arbfjoe3bzh.xn--p1ai/data/files/kexigirexiweb.pdf In PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/f7315dad7a48effbe4c1f9d4818a9a98/81800614300.pdfIn PDF document text
    • http://allasclub.com/campannas/file/79596067518.pdfIn PDF document text
    • http://caycanh.vn/images/fck/file/46655949707.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/jkm325rd3jgqvgnp4k3tus1t1f/jazekikave.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1ced7c0230---4317502332.pdfIn PDF document text
    • http://realfootball.gr/userfiles/file/fuluxako.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607d2cc2840a4---43487546122.pdfIn PDF document text
    • http://iphysiology.ru/upload/81569948916.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/9d9e25cce6a41802ea5ab68e4c8e1cad/debexufupugowu.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a83c1def66d---polazumetikuwomulabinupon.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160989a02418f2---16711006742.pdfIn PDF document text
    • http://winso.tw/userfiles/file/sijojufonewebidenokisid.pdfIn PDF document text
    • http://nirmalamathachurch.org/cms_uploads/image/file/41717852045.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/dfc06652b322b26705240f1c19629b61/tukenuxagipudugapebene.pdfIn PDF document text
    • http://beergolfers.com/blog/images/file/25888526229.pdfIn PDF document text
    • http://ccsl.asia/files/27774895574.pdfIn PDF document text
    • http://aminotp.com/upload/files/79623655662.pdfIn PDF document text
    • http://donationwebsites.com/clients/6/68/68901b9e08e997a22fc64c74502b39ca/File/xabibu.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/3d0a4fbf0948edfe75c9032619c67338/sudavuvuro.pdfIn PDF document text
    • http://fertilityupdates.com/userfiles/files/5353989932.pdfIn PDF document text
    • https://producedepot.us/userfiles/files/21897130628.pdfIn PDF document text
    • https://istanbulbalbir.com/upload/ckfinder/files/supiridodokozanunaza.pdfIn PDF document text
    • https://www.esicm-old.org/admin/lib/ckfinder/userfiles/files/rakenobot.pdfIn PDF document text
    • http://dongphuctqueen.com/upload/files/39014363233.pdfIn PDF document text
    • http://speed-r.com/js/upload/files/tafetenufojokusan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=iflash+device+manualPDF 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_off000100cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000118e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118E3 10540 bytes
SHA-256: 20c9d1520943f854a9add148c29cf850ed9b6cb61e573bff2f05b8b20a2a6025
font_02_sfnt_off000130a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130A1 19404 bytes
SHA-256: 1b8f36c10527688dc4938e09fb175aaae704fe08a73f3546e57948b883d81925

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