Malicious PDF — malware analysis report

Static analysis result for SHA-256 12c7fda2a9f842b1…

MALICIOUS

PDF

70.8 KB Created: 2021-06-03 02:03:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 86f7e4579a734b663ae46f72bbe84491 SHA-1: 506affeeab0e3b639909d06c735ef241e4b80ee7 SHA-256: 12c7fda2a9f842b139d78749c6414a8311f518c2dfb741de871e411ef45e35b9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains numerous external links, many pointing to compromised websites or disposable hosting, suggesting a link farm or phishing lure. The document body, though heavily obfuscated, contains a title related to connecting a Bluetooth soundbar, which is likely a pretext to drive traffic to these malicious URLs. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://queure.ru/uplcv?utm_term=how+to+connect+onn+bluetooth+soundbar+to+phone PDF link annotation
    • http://sklepjola.pl/userfiles/file/2887607086.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/57910710097.pdfIn PDF document text
    • http://bsa.by/ckfinder/userfiles/files/28387607066.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/f6c5b7c22277271217d5dc7f2810abe1/fuwavexaragalizamal.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/08d04ba25d2cb2287d6679e94a6700d7/29814476852.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/46928602737.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/guvunukiwamimeradezor.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/4d93057189eb9ae0f94d6b8a1702576f/xovorazirobatajupama.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a931ccce6f---xewim.pdfIn PDF document text
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/58058016674.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/37vpsp93mei69qk1546jpp42j6/femuzupotope.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e85c0382c5---gonipuxizifavivusul.pdfIn PDF document text
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/guxewoxujebilanujukap.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073bbf9e9edf---bipifebe.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072a8c2e17be---81120143695.pdfIn PDF document text
    • https://chpcentre.com/files/file/87516872521.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d729.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD729 5356 bytes
SHA-256: 63e8736ad3119ac84e24c0dc79e500fa6e485e01ebd38fa0261a56b8f6c0574a
font_01_sfnt_off0000e95d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE95D 10920 bytes
SHA-256: a89e532877b562c7508e9b50b6b6995322d3adeff355689698bf4fbad3eb70f5