Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5217dbbdda89457…

MALICIOUS

PDF

85.1 KB Created: 2021-09-14 00:50:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4df7e766951bfcf421e5bfb68466f3ae SHA-1: 16e21d77d2447fbabcdd6d84c6ebdc231eb72648 SHA-256: e5217dbbdda8945770865ab0a403e60fc1ac30feb18e91f6f5b6c3bfcb4de681
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing or scam attempt. The 'SE_CALLBACK_LURE' heuristic indicates the document prompts users to call a phone number, a common tactic in callback phishing. While no scripts were directly extracted, the 'PDF_JS' heuristic suggests embedded JavaScript, which could be used to facilitate the scam or download further payloads. The numerous external URLs, many pointing to compromised or disposable hosting, further support the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://krisoc.ru/uplcv?utm_term=movie+app+for+android+free PDF link annotation
    • https://ntct.dz/ckfinder/userfiles/files/1450540593.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e164928f81---kijekewesezigugokotid.pdfIn PDF document text
    • http://bikipvuikhoedep.com/app/webroot/files/editor_upload/files/98632214963.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/93193599268.pdfIn PDF document text
    • https://nepalipublisher.com/ckfinder/userfiles/files/83495866126.pdfIn PDF document text
    • http://manhchenang.vn/webroot/img/files/25934642238.pdfIn PDF document text
    • http://hyunshin.net/userfiles/file/mejanizogifutolirip.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/muwixoloji.pdfIn PDF document text
    • https://aitalk.vn/upload/files/17209141493.pdfIn PDF document text
    • http://greenflameenergy.com/userfiles/file/19228088320.pdfIn PDF document text
    • https://coopinproject.eu/ckfinder/userfiles/files/45422243604.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16131ad05b11a5---fikuw.pdfIn PDF document text
    • https://hoatuoi360.vn/uploads/files/wazomotibiwonivadoz.pdfIn PDF document text
    • http://hengtongrongshang.com/jingkelun/userfiles/files/20210912145619.pdfIn PDF document text
    • http://mmbassisiprovince.in/files/js/ckfinder/userfiles/files/xibafof.pdfIn PDF document text
    • http://senvietsystem.com/ckeditor/upload/files/59251164714.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/3ba1fdbc7be5e021face9e37896be850/23492900465.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/56782770278.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16134940b5a815---99840097696.pdfIn PDF document text
    • http://linpus.com/app/webroot/userfiles/files/zosubovikezalukumaresebij.pdfIn PDF document text
    • https://uudanbury.life/files/file/13113093180.pdfIn PDF document text
    • https://cottingham-group.com/cufiles/files/gebudijapokazarefe.pdfIn PDF document text
    • http://cleangroupbd.com/ck/upload/files/75034192333.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_off0000eb5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010371.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10371 10236 bytes
SHA-256: 53ec8e0cd30e6542558d854538326999f38f5fed347f642eadf9552989fb8de5
font_02_sfnt_off00011a89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A89 17180 bytes
SHA-256: adaa8e26e4b63fc4a7ed902e3794b98289959c2f9aab3e863a79c56587baf5be

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