Malicious PDF — malware analysis report

Static analysis result for SHA-256 d93a1eb6024ad0b8…

MALICIOUS

PDF

74.8 KB Created: 2021-09-27 07:12:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: dd2a842395ce83cbb245bbcdbe3cdeb0 SHA-1: 340743f98fa77ebf4a98652a7432f0b2f6c4f035 SHA-256: d93a1eb6024ad0b87d1f2238874c638a556f4b03495091d3f1290e24dc54d0a5
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document exhibits characteristics of a callback phishing scam, as indicated by the 'SE_CALLBACK_LURE' heuristic. It contains numerous embedded URLs pointing to disposable hosting and compromised WordPress sites, suggesting an attempt to distribute malicious content or redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://irlanc.ru/uplcv?utm_term=xhosa+bible+download+pdf PDF link annotation
    • http://studio-orlandini.com/userfiles/files/70807069514.pdfIn PDF document text
    • http://circuitvietnamcambodge.com/hinhanh/file/nuvekudavijexaw.pdfIn PDF document text
    • http://studiopol.com/userfiles/files/82732378868.pdfIn PDF document text
    • http://deliver.cueicha.com/assets/upload/files/61991785405.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/16147deebae92a---87043430820.pdfIn PDF document text
    • http://mamitobe.ru/files/file/sukadesiwuke.pdfIn PDF document text
    • http://atdawnwelift.com/userfiles/file/69140627145.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148ac671a642---xikuduvijidejax.pdfIn PDF document text
    • http://teewer.mn/ckfinder/userfiles/files/mituwinixikimu.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614fb1b6e94fe---fopixoruw.pdfIn PDF document text
    • https://armature.ir/cache/fck_files/file/wudisiwukasotukukotunu.pdfIn PDF document text
    • http://ozdesignhouse.com/app/webroot/uploads/files/2598778181.pdfIn PDF document text
    • https://escaletravel.com/userfiles/files/duzosabakefemomigufixakid.pdfIn PDF document text
    • http://fli.edu.mn/ckfinder/userfiles/files/70263118659.pdfIn PDF document text
    • http://csc-vietnam.vn/uploads/userfiles/file/14560516341.pdfIn PDF document text
    • http://technology-mp.it/userfiles/files/jisanobapogan.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/161305bc890008---xebulezedipudafe.pdfIn PDF document text
    • http://tjsyjdq.com/v15/Upload/file/20219252314267312.pdfIn PDF document text
    • https://led7.ru/file/43837588780.pdfIn PDF document text
    • http://j1medical.com/uploaded/file/fakuvotivetuvekemu.pdfIn PDF document text
    • http://lammermoor.net/imagenes/file/fogutefaxetimupajunafiwi.pdfIn PDF document text
    • https://godahoian.com/app/webroot/upload/files/54382885638.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/8a2b38b6b0577477fc80794c7ba246ab/25360274061.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_off0000bc17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC17 10632 bytes
SHA-256: fe737f83e29007ffd7fea6609c938b33410aaf716eba9b1099499e9ffa5829cf
font_01_sfnt_off0000d422.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD422 19244 bytes
SHA-256: 9dd9c22020b8ef2bbcd4c8fe15b68b18fc88e4af8fae64415afd1befa79b29f3
font_02_sfnt_off00010615.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10615 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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