Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8914b05ea47132b…

MALICIOUS

PDF

76.0 KB Created: 2021-09-07 00:17:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: ae4d9d1bb42458acc1efcefca0fedd2d SHA-1: 671eab5eaf10c99651102c19390556513a48362b SHA-256: f8914b05ea47132bf5d6b94adcef5e9164577eaa9d0bea3e35392bcc74ca46d8
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to compromised WordPress installations or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://crysiq.ru/uplcv?utm_term=esercizi+inglese+much+many+pdf PDF link annotation
    • http://surmounttravel.com/userfiles/files/24681137778.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/befumusivamozofisedidonu.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083b411300d6---gorupanevogasenebepe.pdfIn PDF document text
    • http://xn--h1agcmh.com/ckfinder/userfiles/files/54050866607.pdfIn PDF document text
    • https://jlgardner.org/home/jlg/public_html/ckfinder/userfiles/files/jenetuloxomekokibar.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e3f62a5eb---84104617099.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/01d86b0c94f7b55a4ff5078187692e2a/jesigidoxodexikazugefaxit.pdfIn PDF document text
    • https://www.qualityitalia.it/ckfinder/userfiles/files/jafar.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/1e8c3d53dab540e7ac7e06ce38942f4a/rolutesitusaba.pdfIn PDF document text
    • http://springgalleryng.com/Images_upload/files/tekumagijojomafojekano.pdfIn PDF document text
    • http://ddservice-bmw.pl/userfiles/file/88729101003.pdfIn PDF document text
    • http://barrospizzadb.com/uploads/files/bunawejuxixikunulatoxokob.pdfIn PDF document text
    • https://hanyauntuktesting.com/contents//files/vawaduwogipi.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/sogasunumaxobuf.pdfIn PDF document text
    • https://damsindia.org/admin/uploads/file/51776511327.pdfIn PDF document text
    • https://perfecthospitals.org/FCKeditor/file/77225121421.pdfIn PDF document text
    • https://mtmnetwork.net/uploadEditor/files/bitufadetoxubafapufora.pdfIn PDF document text
    • http://cl-pub.com/files/files/46148600212.pdfIn PDF document text
    • http://thefarmatarapahoecounty.com/userimages/geponin.pdfIn PDF document text
    • https://m3csrl.com/file/vijedivukamenomitalata.pdfIn PDF document text
    • http://avanti.pl/userfiles/file/56338115508.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/161245c67af82e---23224512787.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b3e018558---19554830763.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_off0000c374.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC374 11108 bytes
SHA-256: 78a46288367df23e820eb2aae541151b937dd85afeb805e31b83591c782b8421
font_01_sfnt_off0000dcfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCFB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f50d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF50D 17572 bytes
SHA-256: cd5446f15933fa3015d878f90cbbeba394596fadae2f3938391feb16c1b5a51a

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