Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f4e25664dd236f1…

MALICIOUS

PDF

77.8 KB Created: 2021-09-16 16:25:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8e07495d03c42eb36721e0a924a7036b SHA-1: 85a446b041de4fb19e4df39885a011fcb8b57da9 SHA-256: 4f4e25664dd236f178478d6f250db5b9e653495f19349c81593a462cb8d78a72
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious Link

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicate a high probability of maliciousness. The document contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of heuristics related to QR code and callback lures further supports a phishing or scamming intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://chcial.ru/uplcv?utm_term=can+i+connect+my+phone+to+firestick PDF link annotation
    • https://geneolock.com/locktactyuma/userfiles/file/xosawudavelozoxenadosax.pdfIn PDF document text
    • http://cissi.it/userfiles/files/24684553038.pdfIn PDF document text
    • http://hotelbasantresidency.com/uploads/38371998099.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/161410df05f15e---97926554682.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/161425135ce561---ridakukudoxisegeruz.pdfIn PDF document text
    • http://lanaecoloridabruzzo.it/userfiles/file/konidukajunuji.pdfIn PDF document text
    • http://aal.tw/uploads/htmlupload/files/77510088646.pdfIn PDF document text
    • http://tpt.taipei/asset/uploads/files/54420570594.pdfIn PDF document text
    • http://marcobernini.it/userfiles/files/jezezakudadu.pdfIn PDF document text
    • http://bhhangkhong.com/upload/images/files/93139947349.pdfIn PDF document text
    • https://pataniforum.com/admin/jquery/ckfinder/userfiles/files/96146536547.pdfIn PDF document text
    • http://panda-es.tokyo/yamituki-n/uploads/files/13125281843.pdfIn PDF document text
    • http://www.plain-pied.com/editeur/ckfinder/userfiles/files/mekogomelizumowepa.pdfIn PDF document text
    • https://himalmanpower.com/ckfinder/userfiles/files/nobutajijixavaguwipe.pdfIn PDF document text
    • https://digireg.si/upload/81437936087.pdfIn PDF document text
    • http://hvpeds.com/upload/contents/file/fabedotisufetatiso.pdfIn PDF document text
    • http://favorit.pl/userfiles/file/93910551015.pdfIn PDF document text
    • https://stayinbranson.com/ckfinder/triplebuserfiles/file/bibizasek.pdfIn PDF document text
    • http://xn--80akazwaeiw.xn--p1ai/editorfiles/file/7742065278.pdfIn PDF document text
    • http://farmaciafasolis.eu/userfiles/files/77302928769.pdfIn PDF document text
    • https://pottoka.info/files/galeria/files/sawixutovuva.pdfIn PDF document text
    • http://zenobiacultura.it/userfiles/file///55534971682.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613a75da06ea4---xadebefalaz.pdfIn PDF document text
    • http://studiolorenzoni.eu/userfiles/files/62632762678.pdfIn PDF document text
    • https://bdata.vn/upload/files/fozibivatizaboduzopo.pdfIn PDF document text
    • http://playitdirect.ca/ckfinder/uploadfiles/files/3086838059.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/40483171532.pdfIn PDF document text
    • 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_off0000cb8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB8F 10936 bytes
SHA-256: a065c7f09821655adedd01c850a1b28cb5959bf7a962513569ba38dc6e06852b
font_01_sfnt_off0000e4cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fce1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE1 17204 bytes
SHA-256: e8501fc6283ad435144f23d5f9610045ec8e7deff68d819a5d95c3c284f0b4ad

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