Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6529cb3528fed5c…

MALICIOUS

PDF

84.0 KB Created: 2021-08-19 00:44:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0be89fa7bdb181ec6e1af62425711539 SHA-1: 476e3ab6d074a89ad6a1fd75b01ebd8b8c941525 SHA-256: d6529cb3528fed5c0fa7d48f1d6b0b761d44f5b05ad7e6a216ac960c0712ecd0
156 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate this PDF is malicious. It contains numerous links to external websites, many hosted on compromised CMS uploads or disposable domains, suggesting a link farm or phishing lure. The PDF's structure and embedded links are consistent with attempts to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://calmoinc.com/upload/editor/file/parugopezejowowesotipem.pdf In PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16112cebdd6049---tenemo.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/90545024538.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/xotizevorazofogeweg.pdfIn PDF document text
    • http://year-c.com/upload_fck/file/2021-8-11/20210811190439854775.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607666078dc78---tobimibetabimuz.pdfIn PDF document text
    • http://unipsyclinic.com/userfiles/file/20210525210934.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/63644032461.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609b8a1eb63cd---zezuwapise.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/73862770667.pdfIn PDF document text
    • https://eseninternational.com/uploads/files/55134345152.pdfIn PDF document text
    • https://kcharp.com/ckfinder/userfiles/files/59354066799.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609ca7e06d8f3---15070707753.pdfIn PDF document text
    • http://indianspringhomes.com/userfiles/files/bajopubivawudanexuxif.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/17349597625.pdfIn PDF document text
    • http://edgecs.net/documents/32490291030.pdfIn PDF document text
    • https://deshpanday.com/ckfinder/userfiles/files/wanoxakolo.pdfIn PDF document text
    • http://genbreedpublisher.com/files/upfiles/file/32433161079.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1aa5954c4---kuxewogofiwosijiwikotopu.pdfIn PDF document text
    • https://bucatariizidite.ro/printuri-fi/files/pulitusuvukagesagusew.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4091a7508d---fanefokirajupaliruwewofav.pdfIn PDF document text
    • http://izeninfo.net/admin/upload/files/47793062970.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=how+to+connect+soundbar+to+roku+tv+with+hdmiPDF 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_off0000e3f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F6 11064 bytes
SHA-256: 6a3029beb3473279f6d6fa944d0b63c6da2cf21c9c6e34bad69e41ce9e3b24e6
font_01_sfnt_off0000fd94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD94 16796 bytes
SHA-256: 5eaa2a84e0a19b3faddf0996a1434b2ea1c89f59ec3809ea007b9e94c2d75088
font_02_sfnt_off00012939.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12939 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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