Malicious PDF — malware analysis report

Static analysis result for SHA-256 6426208633bcb643…

MALICIOUS

PDF

80.0 KB Created: 2021-09-13 20:03:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5948d999d6b6ac800644669abb082367 SHA-1: de520838ad0b0f9f45b655a31d6476bd10de011f SHA-256: 6426208633bcb64360e37c0871dc95aad9c4b22a5867af470a2f303e15f47258
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which are hosted on compromised WordPress sites or disposable domains, indicating a phishing or scam attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The primary goal appears to be directing users to malicious websites through these embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://catamma.ru/uplcv?utm_term=ipad+connect+to+pc+software PDF link annotation
    • http://phone-server.com/userfiles/file/82673105029.pdfIn PDF document text
    • http://hsi-international.com/ckfinder/userfiles/files/sasigujire.pdfIn PDF document text
    • https://assignmentmart.com/ckfinder/userfiles/files/94979306836.pdfIn PDF document text
    • http://yangpupark.com/uploadfile/files/91272986924.pdfIn PDF document text
    • http://zgic.ru/!upload/files/lagisonafuziwupotog.pdfIn PDF document text
    • http://fluitec.fr/ressource/site-image/files/pidedalarovuxatogoguga.pdfIn PDF document text
    • http://studiodispirito.it/userfiles/file/wurudaledapa.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/4eacdc48ce584802533b6696f2c378c5/ximaxexi.pdfIn PDF document text
    • http://hyosangjo.com/userfiles/file/20210907165800.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed7cda82e1---kujukowexokefebe.pdfIn PDF document text
    • https://anzhero-sudzhensk.verlauf-ekb.ru/admin/ckfinder/userfiles/files/kakuvezugozejewixefetofi.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/62ba4bc6dacba3b376ec9bc6d93b4122/peruvumal.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16130c0b95f471---8407340525.pdfIn PDF document text
    • https://qualitygums.com/userfiles/file/48135600387.pdfIn PDF document text
    • https://orsam.org.tr/paketler/ckfinder/dosyalar/files/68386697216.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613488938291b---fesafixabegubivuna.pdfIn PDF document text
    • http://godsownproperties.com/userfiles/file/gapoxo.pdfIn PDF document text
    • http://pololanna.com/user_img/files/bigofovesenoletetobuno.pdfIn PDF document text
    • http://insfilings.com/skyzone_classic/upload/files/36842677908.pdfIn PDF document text
    • http://officeharbor.com/pdtInfo/72846721947.pdfIn PDF document text
    • http://www.siscbolivia.com/admin/uploaded/fck/file/65091123692.pdfIn PDF document text
    • https://alohasafaris.com/files/86267239253.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_off0000d70c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD70C 16912 bytes
SHA-256: edb60bdfb03cafeb21266f674bff0b72b38c5a7464ebc45d71675f84a85f8269
font_01_sfnt_off0001025d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1025D 10512 bytes
SHA-256: 1935de30896f217ab702e9bb3d63acbcb26a85f1192e8330100386ec9d7674f7
font_02_sfnt_off00011a7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1