Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2b9d9fade2c0c91…

MALICIOUS

PDF

84.6 KB Created: 2021-09-06 02:48:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f5c3265c60c091187bae21141fed50c2 SHA-1: 939c4c8b71ecd5d5c534c5eec95da4b7f50e9b1e SHA-256: c2b9d9fade2c0c91d3f38282ea3ade269310ade6d43adcbe4f80cd1892d7d8ff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous URLs pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious or phishing content. While no scripts were explicitly extracted, the nature of the URLs and the detection indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • 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=caracteristicas+de+la+autoestima+alta+pdf PDF link annotation
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c483444113a---gobubawuzetakonu.pdfIn PDF document text
    • http://eachfun.com/ckfinder/userfiles/site_eachfun_com/files/nuzosutaruseketebatozen.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/32334927192.pdfIn PDF document text
    • http://eaas-journal.org/survey/userfiles/files/xapebipovokegadak.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/fdebebf19961275a53992e7cae73b128/mukefoki.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/58154477244.pdfIn PDF document text
    • https://angkalaris.com/contents//files/8891718889.pdfIn PDF document text
    • http://wrhs1967.org/clients/6/61/617565fc8afb9cc6d18abf932d248b7a/File/17662092489.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f30789e511---20860755515.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/5gjb57gj35uqarkf6gnffk0mvr/64049359517.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/qno183mpqhnug71faosak6car5/bivuwefuduwegizumu.pdfIn PDF document text
    • https://aghs.in/ckfinder/userfiles/files/peliluminiroduluged.pdfIn PDF document text
    • http://vivatbacchus.hu/files/file/tuwenexok.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ef39a554a2---34821965675.pdfIn PDF document text
    • http://scamps.biz/userfiles/file/80507625346.pdfIn PDF document text
    • http://ohdiabo.net/images/ckeditor/files/wulatevadofujatejoge.pdfIn PDF document text
    • https://facades-et-traditions.com/actualites/file/bukupirasuxezikuw.pdfIn PDF document text
    • https://drrajanmahtani.com/userfiles/files/85910575304.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/73511885054.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/e2d1ubncpun7bh400f4j9pqa26/19997349569.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160747f8d143a3---84831917650.pdfIn PDF document text
    • https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/41mm52mo91fqvmf87v9fp00hin/gufava.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/lajafuriguregokorejin.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_off0000e455.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE455 18672 bytes
SHA-256: e5eab73896748f8dc54368e4e8ea10bd15d5cb83b01432d360690df7a7753b5a
font_01_sfnt_off0001137c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1137C 10808 bytes
SHA-256: 95203d2c886903a748b8ee1ccdbee3fd7b8bb3af45488d2b77acb37949d5de8d
font_02_sfnt_off00012c72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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