Malicious PDF — malware analysis report

Static analysis result for SHA-256 439729a9307a1143…

MALICIOUS

PDF

79.8 KB Created: 2021-09-03 17:26:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b7e3e054e34eb36bda59d55e26fdb83b SHA-1: 511167739f882f6a1117038d120ad76f40aab061 SHA-256: 439729a9307a1143e4e583fd5f213c61812cc2901eff6ee9f4b8b33e944e1ca7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. It contains a link farm pointing to various domains, many of which are likely compromised or disposable hosting, suggesting a phishing or malware distribution attempt. The presence of embedded URLs and the nature of the heuristics strongly indicate an attempt to redirect the user to malicious websites.

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://ketchas.ru/uplcv?utm_term=pipeline+pigging+operations+pdf PDF link annotation
    • http://interface-referencement.com/userfiles/file/favibuw.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/84974298372.pdfIn PDF document text
    • http://i-harmonics.com/upload/files/36531819334.pdfIn PDF document text
    • http://sunnysolutions.it/uploads/assets/file/sevumuxotazagojed.pdfIn PDF document text
    • https://ecoquimica.cl/dinamicos/uploads/file/leruvodesikojakituxu.pdfIn PDF document text
    • http://grandfiltr.com/files/file/paxesamodexerozew.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/hu9h9p82dl29vodttk3151pv4a/jutid.pdfIn PDF document text
    • http://teraval.cz/res/file/bajidixudapo.pdfIn PDF document text
    • http://weddingdove.tw/uploads/files/202108182258468964.pdfIn PDF document text
    • https://www.barrau-philippe-sedeco.fr/ckfinder/userfiles/files/vabufulomurisivepa.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160b68145b7ff6---21153107797.pdfIn PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/2da9ebee839cb7e5068b1882cb734243/sijavixekopawolap.pdfIn PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/84994242995.pdfIn PDF document text
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/c69cae194d29e91cd8c08bdc1635a300/2228734645.pdfIn PDF document text
    • https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/80814902457.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087c42350ac2---37650138939.pdfIn PDF document text
    • http://wellnesszeewolde.nl/site/data/ws/files/14831389406.pdfIn PDF document text
    • http://emurus.jp/userfiles/file/44361924374.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/3dce1449be2256c08c1e1f3118deed15/67721086037.pdfIn PDF document text
    • http://stroytehcentr.ru/images/file/20329266174.pdfIn PDF document text
    • http://ristoranteibucanieri.it/userfiles/files/suzapuroju.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1612b7de7a4652---40567955770.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_off0000d291.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD291 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eaa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA3 18204 bytes
SHA-256: a54b836c633c677215ad6adc92e202b665d88f5b8f857a79828362c018e3fab1
font_02_sfnt_off0001196e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1196E 10676 bytes
SHA-256: 483a16324c0310bbaedcac9456128f64f49039a2ca70dc165bfa025b2c061372

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