Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4bd330b148b8884…

MALICIOUS

PDF

82.5 KB Created: 2021-09-20 06:30:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: dde8f4e620bf3a563eb0b29c905c9f3f SHA-1: 95c6eb20d91d84cb146e5064546f0251b6dbffb6 SHA-256: e4bd330b148b8884a2ca2b6ec53e8c219844e281b4af26d5cf56f4ab036ca0fd
176 Risk Score

Malware Insights

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

The file is a PDF containing numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. The PDF structure and URL patterns are consistent with a malicious document designed to lure users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://oniceh.ru/uplcv?utm_term=teatv+apk+download+for+android+ad+free PDF link annotation
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147eabf604cf---96292916217.pdfIn PDF document text
    • http://bloomx.com/sites/all/sites/bloomx.com/files/demad.pdfIn PDF document text
    • http://superfishinglewood.com/uploads/files/nojexelujoxefon.pdfIn PDF document text
    • http://185.33.116.142/~bbyacht01/upload/files/zotajeveba.pdfPDF link annotation
    • https://spcinternational.in/ckfinder/userfiles/files/pudubo.pdfIn PDF document text
    • http://matraholding.hu/images/userfiles/files/37925875746.pdfIn PDF document text
    • http://circuitoinsulargc.com/documentos/file/88049655343.pdfIn PDF document text
    • https://frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/27126110981.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/wegumusuwizikuwawagiwego.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613810689806c---13282689083.pdfIn PDF document text
    • https://thuhuonglacquer.com/uploads/news_file/kijubivitik.pdfIn PDF document text
    • http://anapro.com/ckfinder/userfiles/files/sulimamos.pdfIn PDF document text
    • https://curtain.jinware.com/upload/files/37371002192.pdfIn PDF document text
    • http://findmecakes.com/userfiles/files/wadesopadarixejasinoza.pdfIn PDF document text
    • http://reklamavysocina.cz/UserFiles/File/nadebasetefopid.pdfIn PDF document text
    • https://dukra.sk/editor_uploads/files/valabofolovamijuloxur.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1614585fe17b15---fivisajiluborejulikoxexil.pdfIn PDF document text
    • http://lnv-cnc.com/userfiles/file/rokolosizitonex.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/80273013764.pdfIn PDF document text
    • https://xn--80aaijz0c.xn--p1ai/ckfinder/userfiles/files/40504255777.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142106c5ef0e---94811909696.pdfIn PDF document text
    • https://maxflowfans.com/userfiles/file/38930488273.pdfIn PDF document text
    • https://kawanmto.info/contents/files/jubipamibiwusizelevelow.pdfIn PDF document text
    • http://alessandrotria.altervista.org/areap/ckfinder/userfiles/files/pobibutulubo.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_off0000dba7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B9 18612 bytes
SHA-256: ca3a2ad5dd08a73a071c44b8a8c44b701f82d148f0646d602ae7327158ea5878
font_02_sfnt_off000123e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123E5 10528 bytes
SHA-256: 0ec2bfe90521afdb7d3b76bf1a686c4ab738fb846136a5f827676e262ee58ee5

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