Malicious PDF — malware analysis report

Static analysis result for SHA-256 6739abe0b353a030…

MALICIOUS

PDF

83.1 KB Created: 2021-06-26 18:49:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 93d6482d097d02126c60a48931392939 SHA-1: 29799dec9832b34c5ad0f7790a7331c0a951035d SHA-256: 6739abe0b353a0300c0a8786b7526b73a143d7994cb710cf059ed8e6813df5a0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm directing to numerous URLs, many hosted on compromised WordPress uploads, indicating a phishing or malware distribution attempt. ClamAV and ML classifiers strongly indicate maliciousness, specifically flagging it as a phishing trojan. No scripts were extracted, but the structure and URL targets are indicative of a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9962

Heuristics 6

  • 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.
  • 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 http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/206776ae927d71c22efc710f1c4b25d5/20398036362.pdf In PDF document text
    • https://fullhousetourism.com/UploadFiles/file/20210531085722134.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16094b9c9e52d2---73898932886.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/c495d92934ce1e06b908f1407e3e94dc/73577312940.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ac462b8a6---tilukiwitusibu.pdfIn PDF document text
    • https://dallaslandscapedesign.com/media/files/11570079741.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/vumakibulore.pdfIn PDF document text
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160794951673af---xidatufijuxisifo.pdfIn PDF document text
    • http://modellszerviz.hu/userfiles/file/84989442375.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/fdba7d1eba31fce7597b531ddda6c1bd/ladepusijabupetazos.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/jexozeditizowidetibi.pdfIn PDF document text
    • http://eraucheta.ru/uploads/file/94566677382.pdfIn PDF document text
    • https://wegofa.com/userfiles/file/71089479684.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff8b790979---pomab.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/71eddd6b2e4863af5014d9bea31f2469/tarelufix.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/gukudamefesixezibedi.pdfIn PDF document text
    • http://webhenevents.com/clients/868374/File/zujenekoregiwifejejamawo.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/terofupasupumasi.pdfIn PDF document text
    • http://ranaghatpchsschool.org/userfiles/file/xuwabefasupogomuwepa.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/63d013o49fti53eohvt4e6d7qp/69950591539.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/96385105619.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080446be7194---36367135483.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=transitive+and+intransitive+verb+exercisesPDF 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_off0000e22c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE22C 17028 bytes
SHA-256: e7e1dac6598e9499ec5181eb7a5511ac55445369b9bb1bc5fc765b8c7b64e7b3
font_01_sfnt_off00010e83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001269a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1269A 10468 bytes
SHA-256: c66e22593d44442976d23cf4d2a579530a854ec7d2e12e7a0dc6a6d7caba4d88

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