Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1a05a28ff928805…

MALICIOUS

PDF

82.0 KB Created: 2021-09-05 04:09:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f87e6bf6fa006f2c870e3c7c4a7ed9fe SHA-1: 9bba7ea9fe4953f70490ba45bee46c8d8fd24b72 SHA-256: f1a05a28ff928805331fb03a26164aead229c3e71f042970dd85a9420800012a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and multiple external URIs, indicating a malicious intent to redirect users to potentially harmful websites. Heuristics suggest it's a link farm on compromised CMS uploads and disposable hosting, likely serving as a phishing lure or a distribution point for further malware. The ClamAV detection as Pdf.Phishing.Trojan further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.
  • 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=leg+workout+program+pdf PDF link annotation
    • http://www.ktgroup.co.uk/ckfinder/userfiles/files/97761791860.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/82464424836.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1607c38bc4304a---52703621843.pdfIn PDF document text
    • http://inistor.com/ufiles/files/disepusulalefi.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/e7eb860800e4ddd95bfc944391726264/feditoj.pdfIn PDF document text
    • https://thuaphatlaihanoi.net/uploads/files/xakozitizokigas.pdfIn PDF document text
    • http://zae.me/datafiles/file/48134709682.pdfIn PDF document text
    • https://smartmedia.ro/app/webroot/files/userfiles/files/kugelunezafevu.pdfIn PDF document text
    • http://viacaosaopedro.com/www/js/ckfinder/userfiles/files/38445154683.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/bdr0v5eq0ntm8pmasfga0d7rv0/40902512458.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/5b3047b966e8691c53148180aace1be2/zilunenemuvuvuv.pdfIn PDF document text
    • http://thallo-food.hu/uploads/ckfinder/userfiles/files/dunatulojavebipatinomes.pdfIn PDF document text
    • http://mellorymotors.ru/admin/ckfinder/userfiles/files/47727204687.pdfIn PDF document text
    • http://telegid.tv/userfiles/files/3631862432.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a03accee1e---kexetimuzafadilalafanijuz.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/6eac9fec776537fd49a2b41928e514fe/vufapajewebakobubib.pdfIn PDF document text
    • http://megalaserasia.com/upload///foduxom.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/27940706910.pdfIn PDF document text
    • http://haai.org/upload/file/ravifomipoxagopitovemakos.pdfIn PDF document text
    • http://euro-ex.net/images/blog//file/75896028234.pdfIn PDF document text
    • https://kingdomofgodmn.org/userfiles/files/loforizutopuvukavita.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/c26905cddc97257d50c6aef389a3f371/757625216.pdfIn PDF document text
    • https://panegovernance.com/ourprojects/chowki/UserFiles/file/72820609492.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612bf4365fae9---74204532979.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/g0gp7bmujm5rm9b99lsjn07sh9/77951790697.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_off0000dc61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC61 17720 bytes
SHA-256: f355e88e41f5f754c99373755d453d4304137908f284cee00563c555b4c57cbc
font_01_sfnt_off00010a1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012232.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12232 10668 bytes
SHA-256: 3c72024f891d6d3ac6ab76d608fa5ccc153554250c912431d3d3f7c1e67a3f2b

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