Malicious PDF — malware analysis report

Static analysis result for SHA-256 4573051b1d057418…

MALICIOUS

PDF

85.7 KB Created: 2021-09-17 11:47:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f531dc7b0546443a859f2637344482fa SHA-1: 9c2779804d116edde8037e1cfe77cb4d3cc621eb SHA-256: 4573051b1d057418f2cec881a767fdc6b44a37eac6f8ed5adc2cbae8ab096b11
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many of which point to websites hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious lure designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://philabc.ru/uplcv?utm_term=patton+2015+qualitative+research+pdf PDF link annotation
    • http://ibshop.gr/uploads/_uploads/files/daveme.pdfIn PDF document text
    • http://abwwilson.com/uploads/files/ledisazozitumaribur.pdfIn PDF document text
    • http://fatename.com/uploads/files/202109030227481622.pdfIn PDF document text
    • http://reklama-v-sochi.com/ckfinder/userfiles/files/97373168257.pdfIn PDF document text
    • https://hankilfood.com/userfiles/file/20210916072112.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dd04242505---95897784927.pdfIn PDF document text
    • http://xn--72c7caerxx0d3a9eve.com/UserFiles/File/kosedowewidedikero.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/e0eda81282e381e67d5ce8018eb49dd6/58599612355.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/161329d3cb4434---watawapolokazisabuzutosox.pdfIn PDF document text
    • http://mardeestilos.es/fotos/file/85403958758.pdfIn PDF document text
    • http://mawratanews.com/armedia/uploads/files/24855122227.pdfIn PDF document text
    • http://reklamavysocina.cz/UserFiles/File/66180157436.pdfIn PDF document text
    • https://christianbelieversmatrimony.com/web/christiansbelieversmatrimony/photos/ckeditor/files/40219661842.pdfIn PDF document text
    • https://hotelite.in/userfiles/file/foroba.pdfIn PDF document text
    • http://kommunikator.nu/demo/userfiles/file///73898258454.pdfIn PDF document text
    • http://fteq.ru/files/file/vizujewedorigigibaxup.pdfIn PDF document text
    • http://instalace-charvat.cz/userfiles/file/17736812500.pdfIn PDF document text
    • http://nutrizionisti.eu/public/thread/risorse/file/8085640931.pdfIn PDF document text
    • http://stagegator.scorchmark.com/stagegator/ckfinder/userfiles/files/matixenu.pdfIn PDF document text
    • http://umffz21.ru/admin/ckfinder/userfiles/files/48156448614.pdfIn PDF document text
    • http://motovelo-nmsk.ru/userfiles/file/22005608856.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/16130609e0a659---9243611648.pdfIn PDF document text
    • https://electroagro.es/pub/files/gefarodunexobevikid.pdfIn PDF document text
    • http://solyaris.pro/admin/ckfinder/userfiles/files/mazibu.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_off0000e956.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE956 11460 bytes
SHA-256: 27c280b2e257d37c67aceea81f463e5e15803b80ce46f314dd31a99fda3fce7d
font_01_sfnt_off00010455.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10455 17488 bytes
SHA-256: 4bcbaa2de1c16e1a3d31e0544e4fe302aa781dbc8e80a99087b0ab27f3b02867
font_02_sfnt_off00013176.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13176 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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