Malicious PDF — malware analysis report

Static analysis result for SHA-256 1657037b5c222cda…

MALICIOUS

PDF

76.0 KB Created: 2021-09-01 21:10:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 27953946a285b4dd3e1bee5f8fe95c8d SHA-1: 94845013b9e4fb73eb8cedfe567650ec6d88ffa9 SHA-256: 1657037b5c222cda2d930f75afcc7e20e5cf5a5213908058b23946264fa9a2b0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many pointing to compromised CMS upload directories or disposable hosting. This indicates the file is likely a lure to redirect users to malicious sites, potentially for phishing or to download further malware. The ClamAV detection and ML classifier strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://crysiq.ru/uplcv?utm_term=cracks+in+the+parchment+curtain+pdf PDF link annotation
    • https://mmoxx.mn/userfiles/files/zuxajaxupefijid.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608acdf61347d---nerojawanepabunokezotegez.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab27845fda---vewulofus.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/mfmgl96vismfuotf4plrefrob3/bagozubo.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/8ce44a6075d8fb1f9dbb4cd08f83b466/28220829018.pdfIn PDF document text
    • http://ponderosaclassof1990.com/clients/d/d5/d5d19f6fc184e1fdd834fc62be9f1763/File/siponokigizose.pdfIn PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/zapibafugazene.pdfIn PDF document text
    • http://vicorsupply.com/uploads/images//files/bejudomilazugoriwa.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608deaa1381af---38375596647.pdfIn PDF document text
    • http://tzoetemondje.be/uploads/files/rirejagikol.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/01036dbb7a44da72a7d0802e1df4fc81/50933128102.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/fd21dc2b0da481f90bf8fe81812951ec/99522841200.pdfIn PDF document text
    • http://gallery4walls.com/upload/editer/file/50079661238.pdfIn PDF document text
    • http://logisticsnetworks.net/ckfinder/userfiles/files/jiterimodo.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f02229b8ec---lulajulot.pdfIn PDF document text
    • https://nikoljski.com/ckfinder/userfiles/files/3480927246.pdfIn PDF document text
    • http://luberoff.com/userfiles/file/21281639662.pdfIn PDF document text
    • https://silatur.com/js/ckfinder/userfiles/files/wonexugi.pdfIn PDF document text
    • http://cuspsurgeons.com/userfiles/file/junewuvisojapi.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a1fb80432ea---javinanafivedipipuma.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8170e4ad7d---61126226391.pdfIn PDF document text
    • http://matchedtubes.de/userfiles/file/foxaxevozobovakuj.pdfIn PDF document text
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16091c380bd22d---nopinabaruveworad.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_off0000c6ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6CE 16184 bytes
SHA-256: b7f97d1807eeb7b39acb158db716ed9cc6a7071f60d036a8c984bcdc2cae7874
font_01_sfnt_off0000f06d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF06D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010884.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10884 10944 bytes
SHA-256: ea917459ade3650eb86ab27e49f0c68b80597d7fb852ed63c70820eebcc43d5a

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