Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d1a8414020fb154…

MALICIOUS

PDF

84.9 KB Created: 2021-09-01 01:21:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4cab47c0c5d3069f327a94e138dc1ff8 SHA-1: d547a06d6c9c9495620257c43ec8408cfe7c188c SHA-256: 5d1a8414020fb154c28fe01fe6c4dd1dd7a8f67d1ae00263abd7a31d4afb1140
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://allytemp.ru/uplcv?utm_term=create+pdf+from+bmp PDF link annotation
    • https://sandzak.best/wp-content/plugins/super-forms/uploads/php/files/57g57j3iohjfbiqqnmop9jnctt/xakipogito.pdfIn PDF document text
    • http://1960whs.com/clients/7/73/73384dfd0d582a2861cf356c55c3c578/File/xipom.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607f84611388b---vafidumar.pdfIn PDF document text
    • https://tagoproperties.com/ckfinder/userfiles/files/lovatunebefutevutetiza.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9a3207ba21---vezuvetaver.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/315a167987efdb5db1670b040835ab6f/4459530151.pdfIn PDF document text
    • http://wchs65.org/clients/b/bb/bb65574a37642f7fe3135935df861e67/File/gagatugafubarinefeba.pdfIn PDF document text
    • https://ferdavagnar.is/images/fck/file/zudexezewununap.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac076dac9ab---pilazugororenilosibo.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160820fecb98b5---54965534689.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbad261246---povaguwewerotos.pdfIn PDF document text
    • http://ckm-machinery.com/userfiles/files/xixolafafo.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1608b81193b64b---rotatetulukevo.pdfIn PDF document text
    • http://consorzio-csa.it/userfiles/files/77547418313.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a684418b975---53406415392.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16076895ee8f15---56126653885.pdfIn PDF document text
    • https://www.oalysa.cz/ckfinder/userfiles/files/14420360306.pdfIn PDF document text
    • https://www.hermanosvalerorecio.com/ckfinder/userfiles/files/22030870476.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/ed7e8a70c55eecf1edf0050a7b3a43a9/90059365198.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/sijanidizevemusuf.pdfIn PDF document text
    • http://fittbike.hu/files/file/8596243941.pdfIn PDF document text
    • http://fst-uinsu.net/userfiles/files/xamidizopagixosibodojub.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16082623635023---54168544850.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/6b3v2k8q6ga6e04h91i1lgu0h4/gukiposivoweboxovilo.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/14703653999.pdfIn PDF document text
    • http://gruppocaminiti.it/userfiles/files/feran.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_off0000e5a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A2 18180 bytes
SHA-256: 6eccfdb8bed4a18ed07167619febd6668f2f7740dc216669dbf32b803f308ac1
font_01_sfnt_off0001155a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1155A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D71 10420 bytes
SHA-256: cc9c1c5eb895e2fa59c49a47637212853bfb0880596f140a33b56a05229548e1

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