Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5ad2155b45b6d1a…

MALICIOUS

PDF

72.8 KB Created: 2021-08-31 20:51:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d1f067fbcd90c51f79697b93aff1a778 SHA-1: b314a8a5269c34368f28ce4ede0ffd5a3da488f5 SHA-256: e5ad2155b45b6d1a858fbd401689b14e4826dd51d866acf739579b382800f24d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites and disposable hosting domains, which in turn host other PDF files. This suggests a multi-stage attack designed to obscure the ultimate payload and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 http://absolutelyneon.com/userfiles/file/8984519134.pdf In PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160863fe082952---34206006340.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d69c7a7ab8---49885054951.pdfIn PDF document text
    • https://art-eria.pl/mandarynka/pliki/files/gomesupejizagazamesox.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8d94cfe47---tujamoruji.pdfIn PDF document text
    • http://bannails.com/fckeditor_userfiles/file/89917599208.pdfIn PDF document text
    • https://muguet.fr/sites/default/files/file/32139349464.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160bae55e14960---47612773558.pdfIn PDF document text
    • http://gartenmessebau.de/uploads/files/muxiletopumesidunut.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/m1pio2oamoklatqn14vvobrt27/powek.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/73932932707.pdfIn PDF document text
    • http://j-line.ca/fck_upload/file/90819306411.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6056e40e1---saxipikukupokofogima.pdfIn PDF document text
    • https://albizy.com/ckfinder/userfiles/files/25361738531.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bc8ded5aa9a---5306870459.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/41195939002.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/4c44c726ee092efa74c0b9d6ef0b2639/lanenifipujixefek.pdfIn PDF document text
    • https://famecosmica.it/file/poxasolajajanuvuzavu.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a05262a5be3---gidixuro.pdfIn PDF document text
    • http://thebrownsfamilyreunion2008.com/clients/81208/File/37907577252.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608875152ec0c---33200847690.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=american+chemical+societyPDF 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_off0000bc92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC92 15924 bytes
SHA-256: 7f85d71bde824221fb58751eed90cb4a6f7ecd7465cd7d8e32817e9f2388404e
font_01_sfnt_off0000e573.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE573 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD8A 10592 bytes
SHA-256: f2332ecf75dac7b829198f39de7e94d9be109527b37301193420906645907237

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