Malicious PDF — malware analysis report

Static analysis result for SHA-256 9959aaf9a6fe96f7…

MALICIOUS

PDF

87.1 KB Created: 2021-09-14 12:29:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 17919cb1b860de78dfa39a52f5094a2f SHA-1: 57c8de3e90873c284b035050c36785ecd8fb2fe8 SHA-256: 9959aaf9a6fe96f732bd70068fa59bc9f3bb02de1b101e5407672742d63ea0a3
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan delivery mechanism. It contains numerous links to external PDFs hosted on various domains, many of which appear to be compromised or disposable. The 'SE_CALLBACK_LURE' heuristic suggests a phishing pretext, likely aiming to trick users into visiting these links. No scripts were extracted, but the presence of multiple external links indicates an attempt to redirect the user to a malicious resource.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://archism.ru/uplcv?utm_term=adb+shell+install PDF link annotation
    • http://casaatlantida.com/userfiles/file///kovinami.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136817c5667f---76911772322.pdfIn PDF document text
    • http://myhomeinparis.com/userfiles/files/22385276636.pdfIn PDF document text
    • https://isosklo.cz/uploads/zaradiga.pdfIn PDF document text
    • http://kayapaliinsaat.net/file/434204535.pdfIn PDF document text
    • http://dejede.com/userfiles/file/sibabanejavi.pdfIn PDF document text
    • http://oticonshop.com/ckfinder/userfiles/files/dawosunom.pdfIn PDF document text
    • https://fleseriuassociates.ro/files/file/52320273290.pdfIn PDF document text
    • https://polenhosting.com/calisma2/files/uploads/64708492945.pdfIn PDF document text
    • https://shibbirs.com/media/files/8741504663.pdfIn PDF document text
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/tozenanazi.pdfIn PDF document text
    • http://zgic.ru/!upload/files/vipilejenu.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613d3f3341ec8---69420917331.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba8ee4f2fc---7959423594.pdfIn PDF document text
    • http://podarox.ru/public/files/95921228076.pdfIn PDF document text
    • http://www.lircai.com/web/inline/file/89251428868.pdfIn PDF document text
    • http://mobiliteit.nu/files/12806791282.pdfIn PDF document text
    • http://esenkardeslerinsaat.com/resimlerfiles/59888826167.pdfIn PDF document text
    • https://ruxthai-guesthouse-chiangmai.com/ckfinder/userfiles/files/25161894561.pdfIn PDF document text
    • http://life-homeshop.com/asset/uploads/files/dipetaraw.pdfIn PDF document text
    • https://www.abandassociates.com/ckfinder/userfiles/files/wumitoxolifosikapunow.pdfIn PDF document text
    • http://thankschicken.com/uploads/files/42245880510.pdfIn PDF document text
    • http://vinaktv.com/storage/ckfinder/files/74363469975.pdfIn PDF document text
    • https://knoxvilleremembers.com/media/50560550607.pdfIn PDF document text
    • https://tlkingatlan.hu/kepek/other/file/bijabiseredewipaw.pdfIn PDF document text
    • http://rwdwebwebdesign.com/img-aim/files/kuvedumurokonezorevakamaj.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_off0000efcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCF 18628 bytes
SHA-256: 2cb35f5fc646f5d39a915c6df5590ebdbd49ffa71410a71495b08fea0f73eef4
font_01_sfnt_off00011fcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FCC 10244 bytes
SHA-256: fc6a1d2fe88c25d4580519f9dd6a9735b654355adda1b0d81f62797d02cfee2f
font_02_sfnt_off000136c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.