Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3ed4704be64009b…

MALICIOUS

PDF

81.4 KB Created: 2021-07-25 06:00:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5eed96345cb260c2897223be5a114ee5 SHA-1: 01cf1d46f285d9b927e947f633aae14edc1670cd SHA-256: b3ed4704be64009b5d52bc3d40b99a28eae35b6044919106dacd6f783685dec5
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites and disposable hosting, indicating a phishing or SEO manipulation attempt. ClamAV detection as 'Pdf.Phishing.Trojan' further supports malicious intent. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://laurallo.com/ckfinder/userfiles/files/62234088504.pdf In PDF document text
    • http://kyanite.tv/userfiles/file/naroketuwikegoxariwenokod.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/8631f47f248fb756962569dae7e0722a/kupodobitumufiniwixi.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/99963300011.pdfIn PDF document text
    • http://www.uniformsolutionsforyou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d541034a1a---15241732984.pdfIn PDF document text
    • http://woori-tour.kr/FileData/ckfinder/files/20210716_A195469942618422.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/de4a730f5f2d028716629d22d413ba6f/zejakelarak.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0a0d10f47---91528989546.pdfIn PDF document text
    • http://hzdsbg.com/uploadfile/1625374283.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608254589806a---paresatufifujalevazo.pdfIn PDF document text
    • http://accomplishtheimpossible.com/userfiles_ati/file/17214826543.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16094d3a6b0ef5---sixuwubegani.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/50309806845.pdfIn PDF document text
    • https://o-dance.com/upload/files/vepulo.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e325861dcc---16390747415.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/lalajotowatepev.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/93baa1ea50112d9efabbdd9ed2bf7371/64930522233.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/274827c0f7b65b79bd9baf02db49bc73/ditanu.pdfIn PDF document text
    • http://alacarte-grafik.de/userfiles/file/66467439697.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/fuwokotipewetuzavuvo.pdfIn PDF document text
    • https://lonnebacka.se/anvandarbilder/126/files/fizasilividebu.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160e5c174d8c10---sikugalumol.pdfIn PDF document text
    • https://tresonance.org/uploadfiles/mesusipuxadanawaz.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/dcac14138abf94ed95cc6194e4d34b8f/puketepitawasuzabaru.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096064f64880---tedewabe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=how+to+change+drive+belt+on+simplicity+mowerPDF 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_off0000d959.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD959 11360 bytes
SHA-256: 36fc46e16148ed88cc1ff94c6b56499836a96efa5aeb22d006e04e98bc93b896
font_01_sfnt_off0000f381.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF381 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B93 16652 bytes
SHA-256: 0c877c0091a6b87b953203d9b6ffc3a86a55ed35b74a8d79f3cda2e6e3a8dc53