Malicious PDF — malware analysis report

Static analysis result for SHA-256 226c618ee349ea25…

MALICIOUS

PDF

69.0 KB Created: 2021-09-29 12:56:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 0205969d7ac6db1afb848d8a92495672 SHA-1: 1fbfc42e5143ca33ff14fa625975f15ee4ea2588 SHA-256: 226c618ee349ea25652d541da2e0cae34dce282438c1ee33c6ddfa289f5bef1a
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external links, some pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution attempt. The 'SE_CALLBACK_LURE' heuristic indicates the document may prompt users to call a number, a common tactic in tech-support scams or callback phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 8

  • 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.
  • 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://ketchas.ru/uplcv?utm_term=bounce+evolution+apk PDF link annotation
    • http://4bx.pl/public/file/84074829305.pdfIn PDF document text
    • https://www.uflo.edu.ar/ckfinder/archivos/documentos/kadagumomi.pdfIn PDF document text
    • http://studioguatta.it/userfiles/files/18421615521.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/f74ec8928cc343775b5e1b8757a03516/zekaz.pdfIn PDF document text
    • https://marblobathware.ph/app/webroot/img/files/78725444521.pdfIn PDF document text
    • http://phuvuongcorp.com/luutru/files/61539555770.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5sm6mg3voel7b5njn5bmfodbd7/fijubariwenoze.pdfIn PDF document text
    • http://k12kos.com/ckfinder/userfiles/files/24219323177.pdfIn PDF document text
    • https://cultureresortpokhara.com/assets/userfiles/files/bijanekatobojogimoji.pdfIn PDF document text
    • https://keepingscore.org/userfiles/file/54861861200.pdfIn PDF document text
    • http://saaretravel.ee/images/file/24302664697.pdfIn PDF document text
    • http://hamyarsanatco.com/ckfinder/userfiles/files/vanorilomowudexiga.pdfIn PDF document text
    • http://zjgjqmr.com/v15/Upload/file/202192095359346.pdfIn PDF document text
    • http://xn--80aer5aza.xn--19-kmcm3c.xn--p1ai/ckfinder/userfiles/files/katowebaxopuzosikazaxojo.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/361895205a96698020265f5b8b1ab4de/18651701811.pdfIn PDF document text
    • http://daisin1977.com/js/upload/files/67629691154.pdfIn PDF document text
    • https://chung-pei.com/userfiles/file/fugarusot.pdfIn PDF document text
    • https://owop.challengersports.com/userfiles/files/wapogamolosu.pdfIn PDF document text
    • http://epmachine.ru/d/files/zumilutetazixekijebu.pdfIn PDF document text
    • https://tybistanbul.org/resimler/files/likupobibedo.pdfIn PDF document text
    • http://hoangnamjsc.com/upload/files/30413269034.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_off0000ad5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD5D 16500 bytes
SHA-256: ebef00b72fe991ec9a4c95f91a687d069d37926b7f44f2c40c42795a51b6b70f
font_01_sfnt_off0000d6f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF0D 10408 bytes
SHA-256: 7922f3b66f44c48c02171ebcd2821d2fedbd7354af20e1e2a25988eed33248e5

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