Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c8eb7ba9a8e7521…

MALICIOUS

PDF

80.3 KB Created: 2021-09-16 18:58:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7c00a1dca420666a1e0d2fb8f5f3ce53 SHA-1: 22d882bbb5488a854b39c4b811b03cc4b77cc99a SHA-256: 6c8eb7ba9a8e752132fb880b1a32304aa98f901d616532ff87240e9009fd884a
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous URLs, many pointing to compromised CMS uploads, suggesting a link farm designed to redirect users. The presence of these links and the overall structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613f71f3df76c---kigikenemileburuga.pdf In PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/dl61i55i5a3mfismmvuio6rbsr/46005696279.pdfIn PDF document text
    • http://musicfriend.vn/public/default/ckeditor/files/matupadinebelepib.pdfIn PDF document text
    • http://laxycoffee.com/upload/files/kakedise.pdfIn PDF document text
    • http://ventensis.lt/public/ckfinder/userfiles/files/sizolinefa.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/a3aalc9fp2vat0urvis44l2345/16757043372.pdfIn PDF document text
    • http://alothongtin.com/upload/FCK/file/67686107278.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/73510384579.pdfIn PDF document text
    • https://studioconcept-stand.com/fck_userfiles/file/97752017716.pdfIn PDF document text
    • http://www.la-rocca.pl/app/webroot/files/files/fadijizomitavenogijikenu.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/15e60936ca229b1ed13482e14b6237bf/jowatelozaneponetu.pdfIn PDF document text
    • https://petribax.nl/userfiles/file/19531671288.pdfIn PDF document text
    • https://gtnet-engine.com/ckfinder/userfiles/files/sazilimewevevokoj.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6255d6961---99521161634.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/161417586cae3b---wuxikenebajobulofo.pdfIn PDF document text
    • http://c2r-auto.com/uploadfiles/file/2021091000584073499.pdfIn PDF document text
    • http://itcbeautytrainingschool.com/userfiles/file/58106279252.pdfIn PDF document text
    • https://ipic.vn/userfiles/file/39356168739.pdfIn PDF document text
    • http://lunaleo.pl/userfiles/file/vafufewukunitekozebike.pdfIn PDF document text
    • https://funcarele.com/ckfinder/userfiles/files/kerixa.pdfIn PDF document text
    • https://patc.fr/imagesfile/13001561355.pdfIn PDF document text
    • http://everintelconsulting.com/upload/file/202109141738525492.pdfIn PDF document text
    • http://banner-ever.com/ckImg/files/82749374974.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/587ff30b58183c999cc40710a1a672fa/22127435816.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=voice+call+recorder+for+androidPDF 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_off0000d6b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B8 10172 bytes
SHA-256: 152eafcc7325630f0c1ac57008d9c62e8a478e02a8089a5b2e7ca07d0a8fc6eb
font_01_sfnt_off0000ed85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED85 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010597.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10597 17552 bytes
SHA-256: 6c0e805df2ff8b2a9032de825a80e015ba6db72e8e34ee3716185e8e209b6463

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