Malicious PDF — malware analysis report

Static analysis result for SHA-256 68012912a7f57639…

MALICIOUS

PDF

90.3 KB Created: 2021-08-21 11:55:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 58325b8c90e2aff544aeb14b92948675 SHA-1: f5e9b56dbb08a802ea228846061002871e945fbf SHA-256: 68012912a7f576396bfcc95a621f4d1e0aadb21a3a41af76c221e975e8d4b65e
224 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links to potentially compromised websites and disposable hosting, suggesting it's part of a link farm designed to redirect users. The presence of a 'download button' lure and brand impersonation (Amazon) indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+deactivate+call+forwarding+in+airtel+postpaid.
  • 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.
  • 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://fceresources.com/ckfinder/userfiles/files/87135794620.pdf In PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/gardf5kqd1voh66a76c8h1to3k/wuderugowugaz.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/c0c1b219630dd34bbc821f175349df80/1027489799.pdfIn PDF document text
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/duwenomazin.pdfIn PDF document text
    • http://www.css-jp.com/upfile/files/2021/06/11/sipixa.pdfIn PDF document text
    • http://pcccmiennam.com/media/ftp/file/rizonawebebu.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160adcb5214c02---paxemolexidutifiw.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/86d52aae5423839aae5c691e64b4360c/newumotidojudavekijokulux.pdfIn PDF document text
    • http://sbkf.org/files/files/rifexudifadowepi.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/b3ed4c8c1a0384cac3d13a9523ef2dee/98938341790.pdfIn PDF document text
    • https://darshanam.com/ckfinder/userfiles/files/40311112861.pdfIn PDF document text
    • http://irinaburmistrova.ru/files/pizidubadujopidiberot.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160d1a17b7daae---85589664125.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f7beb0c4b---90698440435.pdfIn PDF document text
    • http://learningkey.org/userfiles/826699027.pdfIn PDF document text
    • http://jechtinger-wein.com/jechtingen/files/luxizoxexadijepomeza.pdfIn PDF document text
    • https://hotelite.in/userfiles/file/xupamekax.pdfIn PDF document text
    • https://khambenhxahoi115.com/images/files/25052516281.pdfIn PDF document text
    • http://pol2-simf.ru/userfiles/file/nisukelubixekaxem.pdfIn PDF document text
    • http://moveworldtogether.com/datas/files/56137035511.pdfIn PDF document text
    • http://labonscafe.com/userfiles/kupapufuso.pdfIn PDF document text
    • http://chipgene.com/image/files/20210803_081921.pdfIn PDF document text
    • http://thuduchouse.vn/pics/file/bumafupotivoserunamareg.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/026317ca5a2be30433c3f939900fe4cf/xewevefin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+deactivate+call+forwarding+in+airtel+postpaidPDF 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_off0000f945.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF945 10936 bytes
SHA-256: 39669cc0033a66c646e207c8e668cfab091c8a03c337296d770b89436d8293d0
font_01_sfnt_off0001128e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1128E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012aa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AA0 17880 bytes
SHA-256: 7d2cff74c970fc12138d38427ed6062bf84cc3bcb08179969506f513eb1b7f8a

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