Malicious PDF — malware analysis report

Static analysis result for SHA-256 d931547d81cb1935…

MALICIOUS

PDF

85.0 KB Created: 2021-09-17 15:28:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 1010795afece00604e9f2ed2ac6e99b4 SHA-1: f247dfba9edbc1cbde20d39f58197710ec6871b8 SHA-256: d931547d81cb19351dea8f7c4f0af43b6f0ce2cb799caf266171f078f4a6ee1c
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 http://vistobrasil.net/uploads/file/25800200547.pdf In PDF document text
    • http://artstudiodesign.it/userfiles/files/3645764685.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16139db09cf259---vilusaxugare.pdfIn PDF document text
    • http://www.recko.ru/ckfinder/userfiles/files/17308210103.pdfIn PDF document text
    • http://bestofbeer.ru/ckfinder/userfiles/files/82899308217.pdfIn PDF document text
    • http://sisparts.pl/zdjecia/fck/file/26474676930.pdfIn PDF document text
    • http://adhunikjewellers.com/ckfinder/userfiles/files/juzolov.pdfIn PDF document text
    • https://whatproperty.ng/ckfinder/userfiles/files/79977371985.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/6daca236f4b7edc429f6094749efccd8/vinip.pdfIn PDF document text
    • http://fsnmmaterials.com/UPFILE/userfiles/files/12147908814.pdfIn PDF document text
    • http://bangkokmagnetwire.com/ecodev_test/image_system/files/35317869672.pdfIn PDF document text
    • http://imssp.by/data/images/fxeditor/file/41935322617.pdfIn PDF document text
    • http://bilcafe.it/userfiles/file/kinebodog.pdfIn PDF document text
    • http://yogaschoolofkerala.com/photos/editor/files/tojemebazeg.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/wewuxonovigaje.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/dopk07qk2ab5klphmu1irpeno0/laguruj.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/bdbe037fabecb681166149513561345e/sasekupitiwawepalufi.pdfIn PDF document text
    • http://sriagasthiyarastro.com/FCKeditor/userfiles/file/43686764686.pdfIn PDF document text
    • http://cmtsport.com/pliki/banivetanevibebesoka.pdfIn PDF document text
    • https://jf-orvalho.pt/userfiles/file/ditexaxexotebob.pdfIn PDF document text
    • http://csc0311.com/userfiles/file/20210905025724_r3wos7.pdfIn PDF document text
    • http://ihanzao.com/userfiles/file/20210907222531_2134271034.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=lockdown+firewall+androidPDF 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_off0000ea18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA18 17160 bytes
SHA-256: f11a978fa515d8397c204ff4ae5ef400e41874a5fc061eb287fd92b9a95d0f54
font_01_sfnt_off00011727.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11727 10336 bytes
SHA-256: a5c2154a2db3e2104f413bdf0b15d38d320212509677d1b3be18b75c6a7d29bc
font_02_sfnt_off00012e99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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