Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4fb2b5e741f8582…

MALICIOUS

PDF

89.0 KB Created: 2021-07-22 07:50:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d30a7072cffc84483e5804283364cd49 SHA-1: 48e4ee192620acc32be96a609d41d49825b04c22 SHA-256: a4fb2b5e741f8582cfc5b641b01fb15b12a18939a2fa6af26e807a628ee16dc9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as containing a link farm pointing to compromised WordPress upload storage. The ML classifier and ClamAV also strongly indicated maliciousness. While no scripts were extracted, the structure and URL patterns suggest a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a445103a032---19769536229.pdf In PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c580ef0d34b---29382269716.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/48169708274.pdfIn PDF document text
    • https://theloneranger.tv/clients/loneranger/ckfinder/userfiles/files/dogunanedum.pdfIn PDF document text
    • https://numberonerevolution.it/file/31088535628.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d0592e9daf3---70759838849.pdfIn PDF document text
    • http://www.blueoak.fr/image/file/xaloparidorovaluzami.pdfIn PDF document text
    • https://bustotoronto.com/userfiles/file/sesajesum.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d83001439eb---mefurozub.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/3c330c9b1c76ac24169907c019076392/51369777694.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/kisunefufija.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160716640ca327---54330909847.pdfIn PDF document text
    • https://asharfilalkulfi.com/ckfinder/userfiles/files/34536683053.pdfIn PDF document text
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/zonulakivurujinozokinojon.pdfIn PDF document text
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/6o9tpp8cimel48vp3m05ssoo1f/memufegixituvowo.pdfIn PDF document text
    • http://yomamasushitogo.com/uploads/files/kejezikujunujifu.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/vk6trk0aou7o62jb0c3j3qs1v9/mijilufawo.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/03181fbec4a3a2418f88663efe56e74b/82884141589.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/7o992nr69u8l39eat5ll10jicm/narejige.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/f6dd4bd02d1150760fdfe7663fa72dd2/fetezifozepuvefedotatinub.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607b62b92b3ac---disovixomaditipetuni.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=78+inches+in+cmPDF 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_off0000f798.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF798 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010faa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FAA 18232 bytes
SHA-256: 74d28265d05954606f718a4fb5e07ceec4085773beb8a77370121553cf135a94
font_02_sfnt_off00013fc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FC7 10128 bytes
SHA-256: fb0a3ae51b2691d782ba382c555f763a5496391548c38f6ef1774128a5f8713d

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