Malicious PDF — malware analysis report

Static analysis result for SHA-256 db92dbca4de9cc0e…

MALICIOUS

PDF

83.5 KB Created: 2021-10-23 13:18:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 9021cec6d379d76a01b58b1aacf18b1d SHA-1: 66971be2a3ba41c14a3d20472ee56a25294e67d4 SHA-256: db92dbca4de9cc0edbd46a467acaf7e9c50a78f713093c59527b38676893190f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs, many of which are identified as a link farm hosted on disposable or compromised domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://cvsc.co/userfiles/file/55847862505.pdf In PDF document text
    • http://mirsistem.com/depo/sayfaresim/file/70019247611.pdfIn PDF document text
    • https://pbanerjeeservices.4digitmagic.com/userfiles/file/68879860082.pdfIn PDF document text
    • https://bawaniint.com/ckfinder/userfiles/files/wojadesotobiw.pdfIn PDF document text
    • https://dhrc.in/userfiles/file/modulugiforuzepu.pdfIn PDF document text
    • http://www2.grupoksl.com.br/js/ckfinder/userfiles/files/9735664851.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16146936782947---21697040247.pdfIn PDF document text
    • https://neksav.com/upload/ckfinder/files/lugifuse.pdfIn PDF document text
    • http://minipit.com/data/files/65111559215.pdfIn PDF document text
    • http://househouse.it/userfiles/files/50619259079.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/161562276e4fc7---63949022281.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/161416f39cc299---jazevulelaxobowuwumef.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/c5a7a53f158fd0246bc2c36962a179eb/teterufubot.pdfIn PDF document text
    • https://varida-tech.com/ckfinder/userfiles/files/janesiwesefasebedasusa.pdfIn PDF document text
    • http://1qjd.com/upload/files/2021-10-19-20-14-38-PrtTheIw.pdfIn PDF document text
    • http://directartdeal.com/uploaded_files/userfiles/files/69045090777.pdfIn PDF document text
    • http://rlangkhan.com/upload/userfiles/files/50571461352.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161594b3967a0a---89137319496.pdfIn PDF document text
    • https://www.notusweb.com.br/ckeditor/ckfinder/userfiles/files/76309743338.pdfIn PDF document text
    • https://rt-totaalafbouw.nl/userfiles/file/vufepi.pdfIn PDF document text
    • https://taxfirma.com/userfiles/file/44347754133.pdfIn PDF document text
    • https://pingthye.com/userfiles/files/rufigaledekozumu.pdfIn PDF document text
    • http://marketypik.pl/zdjecia/fck/file/titugizifagufiwoba.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16167498d3167d---lumaxewuwedebokama.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/53701785380.pdfIn PDF document text
    • http://denetimmusavirlik.com/userfiles/file/xumomuwupifakixu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/xPAns0MRe5M/uplcv?utm_term=what+setting+to+shrink+clothesPDF 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_off0000e0f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F8 10596 bytes
SHA-256: bdeeb84cac8e53e7abc6cd0d7d5441284d7114308de6e04a20ce7cae874cf8a3
font_01_sfnt_off0000f92b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF92B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001113d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1113D 18100 bytes
SHA-256: d346f082b2bd132715ebd8a08e4622b7fac600fd15b4e33c30f0e50ee7d43c8b

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