Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbd56bca9f2628c8…

MALICIOUS

PDF

69.7 KB Created: 2021-09-25 07:45:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4d45bc0ae3713a42f7344234a04a6d8a SHA-1: b9a3c4523cb93c3443483a7ff1069a7a4c9a4ae6 SHA-256: bbd56bca9f2628c83f2d990417af0563b37f8e63f970796d39400fe959785f57
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to disposable or potentially compromised hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to deliver second-stage payloads or lead users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://laborke.ru/uplcv?utm_term=voice+jam+for+android PDF link annotation
    • http://www.hgekc.com/media/userfiles/file/gavipuzebagu.pdfIn PDF document text
    • https://chptravel.ir/data/file/zuzupisawixadodojuvun.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614679cd1bcd7---xovovamawabosazilalibane.pdfIn PDF document text
    • http://gordostcrista.ru/userfiles/file/27967177002.pdfIn PDF document text
    • http://damosushipleasanthill.com/uploads/files/sokejuzagamafejaroluv.pdfIn PDF document text
    • http://nbmounts.com/userfiles/file/1631539216.pdfIn PDF document text
    • http://tallygroupkwt.com/uploads/file/11932064308.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/sesibir.pdfIn PDF document text
    • https://aonetreks.com/uploads/file/dojobofokit.pdfIn PDF document text
    • http://gonzagafood.com/userfiles/files/kenawaxeboxezesub.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/5a2af8eff7226ba485737c0c4a6d9d51/juwomixesutabakepijav.pdfIn PDF document text
    • http://seanbittinger.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/22799013240.pdfIn PDF document text
    • https://www.domaine-vrignaud.com/ckfinder/userfiles/files/64166232598.pdfIn PDF document text
    • http://chemicalengineers.ie/images/44981974613.pdfIn PDF document text
    • http://pc580.cn/upload_fck/file/2021-9-10/20210910191701295319.pdfIn PDF document text
    • https://bulendengin.com/upload/ckfinder/files/rijijebanogativix.pdfIn PDF document text
    • http://hotelamadeustorino.com/userfiles/files/44206030683.pdfIn PDF document text
    • https://unchiulmihai.ro/files/fckeditor/file/rupanopumivozizere.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/90707518099.pdfIn PDF document text
    • https://mehreganimaging.com/images/upload/files/poxizalalelikekuv.pdfIn PDF document text
    • http://www.arborvitae.cz/ckfinder/userfiles/files/1222721928.pdfIn PDF document text
    • https://olgunbey.com/upload/ckfinder/files/sixibodudusigiroruvixejix.pdfIn PDF document text
    • https://davaocarrental.com/images/file/16547756988.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/ec966193ef35fe6b6f1c1ce718abbd79/34942823714.pdfIn PDF document text
    • http://gocep.org/data/userfiles/files/liladimekabanorijupo.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_off0000b24b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB24B 10424 bytes
SHA-256: da110cff63f6c0b0d1bdc22714a66b0f3bde8e53c28c9a5d00553417adb7fbeb
font_01_sfnt_off0000c9d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e1e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E8 15540 bytes
SHA-256: 8a3619113893f9e6a63b0625abebe60a634f7631db3f4f80028dc923eb4ac25d

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