Malicious PDF — malware analysis report

Static analysis result for SHA-256 348d1c645b495c06…

MALICIOUS

PDF

99.3 KB Created: 2021-06-29 00:53:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 3c2dca8d1f956ad9d6fa92aba92bda18 SHA-1: 4eed7c148aa877f54991b15cb7b8bdf93fd0c81c SHA-256: 348d1c645b495c06dfb565716b8e76d348794e6fa7e98d55f91efdb73576741a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It functions as a link farm, containing numerous embedded URLs pointing to compromised WordPress upload directories and other disposable hosting. These links likely lead to phishing pages or further malware downloads, indicating a malicious intent to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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=cane+corso+with+undocked+tail PDF link annotation
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d0c9b8d8fb9---pizejuki.pdfIn PDF document text
    • http://helloshoppingnepal.com/userfiles/file/jasurinokopi.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/6d8b0a3f314abbcfba364c87c1f1b9cd/figabuwisavuxonulatu.pdfIn PDF document text
    • https://murtenhof.ch/userfiles/files/8100500689.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/a25bc265d4b889f838135d0496702026/wuguxe.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d234be170d6---lowezapanewozavexevis.pdfIn PDF document text
    • http://fkhd.cz/data/img/31552245806.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/kafovekikovugofod.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/688ga18mn086etsill22govmr1/42628867550.pdfIn PDF document text
    • http://goldenbaycruisesagent.com/userfiles/file/86295071818.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f05bec3b83---putukigonepozebofosifol.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/672c7fd61ddcc28ac6f82a9015cc5e7f/1510507254.pdfIn PDF document text
    • http://rotang.net/userfiles/file/pojutisev.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/01cdc116a7f0e5c85f1e25a370433dc4/46689792377.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160c32b9e8a3b6---ponakasupatefo.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/pevizapemefevefu.pdfIn PDF document text
    • https://wecareprogram.org/images/file/12061775964.pdfIn PDF document text
    • http://autohondl.cz/userfiles/file/68593989363.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/lf58vdkrlkcok9n8r0gkiojjn0/gadabubo.pdfIn PDF document text
    • http://jandenzobv.com/image_uploads/file/884569713.pdfIn PDF document text
    • https://carea2plus.com/wp-content/plugins/super-forms/uploads/php/files/56fe32aba15018d044a55708588acf32/68924280745.pdfIn PDF document text
    • http://peak-experience-japan.com/68321932323.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011376.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11376 10776 bytes
SHA-256: deb9d8104e9b989527b67d065620aed54d3e4b25a5b06f07f85daa15b74e24f3
font_01_sfnt_off00012c43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C43 2296 bytes
SHA-256: 01f027aa1a20ae5e1b2ae90f09b5c7ceaabd8a2f28ba34b996bc5c7d0072686d
font_02_sfnt_off00013678.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13678 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00014e8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E8A 18980 bytes
SHA-256: 3d9114d43d19253c667189fd803184084afa12652c03f1fa3ad6ce23ed5677a0

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