Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf1cbb243ad2a806…

MALICIOUS

PDF

72.0 KB Created: 2021-09-17 00:34:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f407b8003d2df9e24ae6a4f10b963984 SHA-1: 54597d8b181408479ced3501f511c9ebf3616189 SHA-256: bf1cbb243ad2a8065434d5a9b21e54cf72610f1c6d707cacc0b3be850d3bef07
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The presence of these links suggests an attempt to lure victims to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://garglob.ru/uplcv?utm_term=ifruit+for+pc PDF link annotation
    • https://sharedsynergy.com/userfiles/file/78794160498.pdfIn PDF document text
    • http://ketnoikienthuc.com/upload/files/wibujekobexunogededo.pdfIn PDF document text
    • https://thietbidiensino.vn/media/ftp/file/8187494321.pdfIn PDF document text
    • https://xn--80apefbdm9ah5g.xn--p1ai/userfiles/woxalakoboxuwute.pdfIn PDF document text
    • http://megalaserasia.com/upload///jadekapineguvisaziwatum.pdfIn PDF document text
    • http://kahasat.cz/data/file/18458209105.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/2af8cb8a38504855237598dc807c7cfb/4399887773.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139b208440e1---sabowatato.pdfIn PDF document text
    • https://saptabangunmanunggal.com/indomobils/upload/file/89107424809.pdfIn PDF document text
    • https://ijp2.com/contents/files/nujazufolubekuj.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/63224466699.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/52204148595.pdfIn PDF document text
    • http://quangcaovuanh.com/vietkiendo/upload/file/wagarupuvenogixuvemov.pdfIn PDF document text
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/64221696511.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-9-3/20210903011754365529.pdfIn PDF document text
    • http://copy-office.it/userfiles/file/buwiwimera.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/vfd6brbejs2in6bvp6chnicm1r/88990225846.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/1d2ff68aebd2fedd2bd06d00f6234aa1/92865269868.pdfIn PDF document text
    • http://physio-praxismitte.de/userfiles/bogatuwixuzaz.pdfIn PDF document text
    • https://cdmsig1.com/ckfinder/userfiles/files/17931499712.pdfIn PDF document text
    • http://mastervgtour.by/var/upload/file/51487161617.pdfIn PDF document text
    • http://ryukatsu.com/userData/board/file/benowedexisukotov.pdfIn PDF document text
    • http://ceskylakros.cz/userfiles/file/41960371440.pdfIn PDF document text
    • http://transporteslaplata.com/imagenes_web/file/pazib.pdfIn PDF document text
    • https://12shio4.com/contents/files/29500452414.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_off0000bbb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBB0 15872 bytes
SHA-256: 5c93d2d7bcf7c3127cbec1da3e4a6120d734530b6d4808f6d7f3d4b7b153f580
font_01_sfnt_off0000e437.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE437 9912 bytes
SHA-256: afe5f7ebf844f0902a7a86deda06e8cf216f0e06f7cf127217317afb1b534cec
font_02_sfnt_off0000fa31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA31 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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