Malicious PDF — malware analysis report

Static analysis result for SHA-256 d75a34b9e7f15504…

MALICIOUS

PDF

79.2 KB Created: 2021-09-22 20:48:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 504ab1b994fba5ec7fb67f2097d4426e SHA-1: c78389ed2405760122217101a7f1ef8fdc805464 SHA-256: d75a34b9e7f155042b76cc9d9198658a0c3380552263dd8a7e05dbae4974cee6
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with multiple URLs pointing to compromised CMS upload storage and disposable hosting. These links likely serve as lures to phishing sites or malware downloaders, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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 https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/34951982a064abc492c908157c160358/lutogudopakijuxifufukubu.pdf In PDF document text
    • https://tideandtigers.com/ckfinder/userfiles/files/28282503758.pdfIn PDF document text
    • http://doorsatyrau.com/ckfinder/userfiles/files/fusefimopajefabelef.pdfIn PDF document text
    • http://micruts.org/userfiles/file/begotolidoxofikudavebun.pdfIn PDF document text
    • https://whatshoulditcostme.com/userfiles/file/19763263864.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614796266d31c---fudizoz.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/dn4cb8igcj3q27tlk317vetrcf/61932632834.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161418ecc9dea4---zasifojapabo.pdfIn PDF document text
    • https://asiastudy.in/ckfinder/userfiles/files/12825167964.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/2719715161f2985dc96cd95f9747d6e8/nezeginegatewesib.pdfIn PDF document text
    • https://pikhospital.com/ck_uploads/uploads/files/xuwekep.pdfIn PDF document text
    • http://drairtools.com/ckfinder/userfiles/files/lujox.pdfIn PDF document text
    • http://viviapalermo.com/userfiles/files/witokizugonivugazul.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/161383cb2e436a---45061474988.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/va7mpujbsg7l3m58gudsjrkmm6/kibedasoxidiwunesarag.pdfIn PDF document text
    • http://saothienemb.com/uploads/images/files/98513304069.pdfIn PDF document text
    • http://omatsuri.kr/data/userfiles/files/22334551338.pdfIn PDF document text
    • http://lucchetta.net/userfiles/files/jaratumerew.pdfIn PDF document text
    • http://www.wiz-fac.com/uploadImg/file/sufoxev.pdfIn PDF document text
    • http://madurastones.com/userfiles/file/setigabu.pdfIn PDF document text
    • https://szelvedojavitasmiskolc.hu/files/files/98235517118.pdfIn PDF document text
    • http://print-resource.co.uk/ckfinder/userfiles/files/nonukozaxofowigamonozumag.pdfIn PDF document text
    • http://metalzilemboeventi.com/userfiles/files/figitakawonenobaponej.pdfIn PDF document text
    • https://jooli.ru/ckfinder/userfiles/files/1960546895.pdfIn PDF document text
    • https://samsungdvmklima.com/upload/ckfinder/files/8698575079.pdfIn PDF document text
    • http://shanghaicruiseparty.com/uploads/file/dejiwediputuzud.pdfIn PDF document text
    • http://goraku-sangyo.com/userfiles/file/50660205392.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=watch+jumanji+welcome+to+the+jungle+for+freePDF 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_off0000d158.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD158 16964 bytes
SHA-256: c66ec80c9322d808ea699aa62df9003ec0af7f12f9f78e300fc8b7e26bfe1c8c
font_01_sfnt_off0000fdb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000115c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115C7 10924 bytes
SHA-256: 7dd0bfecc848c7a080fe8b181bea3c26399cd7a7bd84dbf5c2cecdc3c9966090

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