Malicious PDF — malware analysis report

Static analysis result for SHA-256 22d40947de4b4144…

MALICIOUS

PDF

84.3 KB Created: 2021-09-01 20:01:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 86f42f247214592b4fc04d7c4ece7e2d SHA-1: ecc38fad41996a12373e2670ba96ed3c753426d2 SHA-256: 22d40947de4b4144822091334a6174a576e873187a77264df567cf04acd27f90
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The presence of PDF link farm heuristics further supports this, indicating an attempt to obscure the true destination or leverage SEO tactics for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://pistant.ru/uplcv?utm_term=ccna+networking+course+syllabus+pdf PDF link annotation
    • http://madmojo.com/fckupload/file/99204482924.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b73fc7e6ca---77893915292.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/nqtv793mh6pt772aeo283nj5s1/maxagomumozo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0026252e10---gavijudo.pdfIn PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/86f1b8aed9113a55c3c93e1843a7fab0/sulejuvamufazure.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1c89bcd64d---zigizederevegoxawiz.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/466388961fda881d66a7cd9cb6e48279/zorajenidejakevedamanow.pdfIn PDF document text
    • http://diamantina-joaillerie.com/ckfinder/userfiles/files/64302702354.pdfIn PDF document text
    • http://thuduchouse.vn/pics/file/jinagixebemisep.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/2j9on9cr9vfm8eld2lc3pt2hi2/vefigizoku.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1611c4dc9e0943---kewulufamalexi.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b028f82735---tibaxelolaxerabevozep.pdfIn PDF document text
    • http://dominoliberec.eu/images/file/files/xowafoxuzo.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6dee106217---46851994732.pdfIn PDF document text
    • http://bukvoznaika.ru/ckfinder/userfiles/files/58156255558.pdfIn PDF document text
    • http://unipsyclinic.com/userfiles/file/20210828092942.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096f92518046---45098747282.pdfIn PDF document text
    • https://anukulagrotech.com/ci/userfiles/files/fexipafitug.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/klpr1s1slgf4kb6lji68h6m3u6/zobolanilosokimadojuzo.pdfIn PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/24638696619.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160b2f8fa226e6---63615164324.pdfIn PDF document text
    • http://thegioioto.store/upload/files/14023937921.pdfIn PDF document text
    • http://zpkprzemysl.pl/ckfinder/userfiles/files/pafanag.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/4148055c12b98faec1acbe35c5492450/bozigeridozowizinolepobe.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_off0000e333.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE333 11360 bytes
SHA-256: bf48783456ddcfb0e33e5f4cec0f011f1ecea5d0c277cad0ca4ea9598ce63d78
font_01_sfnt_off0000fdbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDBC 17376 bytes
SHA-256: ca878a62f8c41341c8244b1787d10f07ac6b9940b5a3623c9556d9316beaa0aa
font_02_sfnt_off00012a85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A85 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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