Malicious PDF — malware analysis report

Static analysis result for SHA-256 288eb9b7fb0ea203…

MALICIOUS

PDF

87.2 KB Created: 2021-08-09 19:04:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5dbce29bc288cc9e4e63f14813013d1f SHA-1: c2f061b9e86f6665bcc33e5600a1730285d3778e SHA-256: 288eb9b7fb0ea203d6c1a85867da1fedda105992aaf660f664d284ba4fd2e176
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains a link farm pointing to compromised WordPress sites, suggesting it's used for distributing malicious content or phishing. The 'SE_CALLBACK_LURE' heuristic indicates the document is designed to trick users into calling a phone number, a common tactic in tech-support scams and callback phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 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.
  • 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://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/a67a8be06e6939e7ac97a5d922203260/guvijanumed.pdf In PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/f9e3a864ca6d7644aa664ae7d0f3fa35/totomujufego.pdfIn PDF document text
    • https://spitalmoldovanoua.ro/ckfinder/userfiles/files/57954938148.pdfIn PDF document text
    • http://vksraja.in/fckeditor/upload/file/nujek.pdfIn PDF document text
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/ph23kf2u30003s6skcaq004de2/zodezuxenutulenox.pdfIn PDF document text
    • https://mt-creativestudio.com/ckfinder/userfiles/files/wefufunajagesejipib.pdfIn PDF document text
    • https://mn-lawfirm.com/box/userfiles/file/82481837809.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/bkcgu8f5i736gcho4fbo29ec0a/98249393880.pdfIn PDF document text
    • http://cesmclassof68cheyennewy.com/clients/82478/File/pakasisabara.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0382d2d782---nijaligikoxazewifoju.pdfIn PDF document text
    • http://mail-ex.net/userfiles/file/75355514991.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/puris.pdfIn PDF document text
    • http://bephoangdung.vn/uploads/ckfinder/files/pabilewum.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160c31b9ac3a97---kutusefomexagomeduboba.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aca04e710a2---jibepitetedexakagobete.pdfIn PDF document text
    • https://kiaavcilar.com/upload/ckfinder/files/81630424905.pdfIn PDF document text
    • http://hzdshg.com/images/upload/File/62032737817.pdfIn PDF document text
    • https://lastcallslc.com/wp-content/plugins/super-forms/uploads/php/files/d55aefcd70c5733633da4318e12e318f/bineselotuvo.pdfIn PDF document text
    • https://noddy.nu/images/file/34492948233.pdfIn PDF document text
    • https://evpersoneli.net/ev-personeli/file/17487218776.pdfIn PDF document text
    • http://eviljoy.com/UserFiles/File/64665966340.pdfIn PDF document text
    • http://theettiaresottawa.org/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/17959783627.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=ortografia+para+ni%C3%B1os+de+cuarto+grado+de+primariaPDF 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_off0000ecad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000104c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C4 11248 bytes
SHA-256: f644a096880733f7fd67868fd68f34626aaa589a7547b02e6d4f386b5726d71b
font_02_sfnt_off00011ebc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EBC 18028 bytes
SHA-256: 90334d492ef2b665c831bac1402794dd87d2436e84ecfe82f2ca33e7f737fcf9

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