Malicious PDF — malware analysis report

Static analysis result for SHA-256 6250aaca6df04dc4…

MALICIOUS

PDF

83.9 KB Created: 2021-09-06 08:19:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 57807dd1a8fc1ca9297e2c55b3f62e20 SHA-1: c98dd0a4df8779155072ce96b0e8075b6fa3a093 SHA-256: 6250aaca6df04dc4b0ab7cee1c551306e8dd7bd4a335b2a9db4b839968f1f8d5
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 0.9981

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://hsse.cl/files/20174409599.pdf In PDF document text
    • http://churchtextile.com/userfiles/file/34960656185.pdfIn PDF document text
    • https://gtselect.fr/ckfinder/userfiles/files/wuwifomodideb.pdfIn PDF document text
    • http://tweddlefoto.com/files_contenidos/upload/files/nebizofofivel.pdfIn PDF document text
    • http://cungcapluonech.com/upload/files/xurezesuxigedizojobakage.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/0671ce5127a433f22d0ce682c5945e7b/10497022929.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/46823566996.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1ebbe3ecdc---vebibenon.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6569bbad7---putavesavelaba.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/4963e5a4acda73ca7db2cda32f0e3a0c/66336622242.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607af8f3884a4---talisopomaxawemonigagorud.pdfIn PDF document text
    • https://k-newsletter.com/ckupload/files/memawegelimekajazi.pdfIn PDF document text
    • http://anandamsanyal.com/userfiles/file/xakexaxifij.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/44461286204.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a073c5b7d15---27402451087.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077acf396dc0---gibixenenuvezu.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/pugudulanowakokur.pdfIn PDF document text
    • http://valifyrepapillon.com/clients/6/68/68e1c6a84db99a04c21676ff826d6e37/File/8267769664.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613126c1970e2---95347050217.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/file/3670081465.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/8rdq20u5de8ppklk7ceuj64is5/xexabir.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/83133218208.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=pdf+split+pages+onlinePDF 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_off0000e40b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE40B 10572 bytes
SHA-256: e70017299bf1fa5ee4c89c0e58a986e4369296454dbd72f71301275cd18a218f
font_01_sfnt_off0000fc0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC0C 18156 bytes
SHA-256: ef5c73ac4a178ae856a5b2feb1745aa1314fe472ca7407df6f60ce355821b8a6
font_02_sfnt_off00012a47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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