Malicious PDF — malware analysis report

Static analysis result for SHA-256 c279154fd051bd92…

MALICIOUS

PDF

89.7 KB Created: 2021-08-03 06:38:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: dad1a30dcc66ee16bbdad02c9ea44f0a SHA-1: 0a76a2e3147d585079e7b4fac37ce833a96e65ab SHA-256: c279154fd051bd92d70745ae97c0db89d493a1d2e0f753b2ef33704e28f4e91f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous embedded URLs that point to a mix of compromised WordPress sites and disposable domains, suggesting a phishing or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to external sites for further exploitation or credential harvesting. No scripts were extracted, but the extensive link farm points to a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://synerhu.ru/uplcv?utm_term=cual+es+el+significado+de+sentido+literal PDF link annotation
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/afa5b2b4f11cc96b323b28a7b4d944de/42104148576.pdfIn PDF document text
    • http://hakkabrothers.com/userfiles/file///ladugifatitukivul.pdfIn PDF document text
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/d49a9508282b651e8882994c39892f67/vunutu.pdfIn PDF document text
    • https://murten-hotels.ch/userfiles/files/39174306717.pdfIn PDF document text
    • http://keigan-productions.com/clients/863431/File/bometowepakiruwupuvuvalil.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16071d29e37474---1519837505.pdfIn PDF document text
    • http://juentai.com/userfiles/files/bopagodirimipusovizive.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16079c5b1417b2---82148212405.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/1fc57dcb74694f00c6a6093cd94500a6/74573094286.pdfIn PDF document text
    • http://maility.pl_adresuserfiles/file/79072219318.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/f58bea11029db0125905e5d6aa95bcfc/mabonenukasipopuvadenivoj.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/tazawudegodukexadex.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/fb5ae9dc591bc3b585fe9b688d5314e3/losovep.pdfIn PDF document text
    • http://autosklo.sk/pictures/file/68634609919.pdfIn PDF document text
    • http://interface-referencement.com/userfiles/file/46579585258.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/60931555572.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160b2417d6368d---57398994997.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/bd2718c28a1690aec06ce23f2ee0be9a/98642847272.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609882ca48207---witelonabovutevu.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/kepodufolo.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094d898b9e3e---nitamovasopepunidizolam.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_off0000f505.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF505 10780 bytes
SHA-256: fe7cc2a1eab34134ec1e58c6f2e4310eceac3ad4068033425c6b2c6f2560cbed
font_01_sfnt_off00010dc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000125db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125DB 18864 bytes
SHA-256: e91611917ddfef6333a7f6582b8942a3da4ccfc4c8dad57e18bff0e4c779952a

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