Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e4f2f16f08a2d7f…

MALICIOUS

PDF

88.1 KB Created: 2021-08-05 20:38:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0702f30c25410b09d58705ab79ffde5d SHA-1: f05fad2fb95fb733cb362e2cbb38d95f36025da6 SHA-256: 3e4f2f16f08a2d7fdcb9b5f13da090fccd689be1af7369c93522c90ab5085475
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://queure.ru/uplcv?utm_term=how+to+stop+adobe+flash+player+update+pop+ups+mac PDF link annotation
    • http://abwingstop.com/uploads/files/43606420358.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/7r2ipb01k2nfk91cbqu1avm40c/pobot.pdfIn PDF document text
    • http://poslovniimenik.net/firme_data/files/73667931801.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2cf4b049df---vujotabupavezulivivuzus.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/qcaunr36vgn689cja6f7581nq5/folumuvutejuvoxokazosejuz.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2bf617e71---vanikopusuxoje.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b1358df37ca---86389746378.pdfIn PDF document text
    • http://abbuffalowings.com/uploads/files/sumedepekuxopomuxolaga.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080eaba68a76---91281631730.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/01273d1d05f91c4b17bd3aba5af35ed5/depikuxugegedazu.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5a3048b0c.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aece72caa9---zivulopizifelagotanex.pdfIn PDF document text
    • https://bem-sa.com/img/file/jovusezukakinufux.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/cjvibqrhduiqm30i9j5qnp62nj/18941060072.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c96ed83bda7---rupajita.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/df39cc21f83a8edaa414ff01f41d68a5/debiwagusonoponir.pdfIn PDF document text
    • http://ore-processing.ru/d/files/nagutijolitegosefulinib.pdfIn PDF document text
    • http://prplus4u.com/ckupload/files/bidojazes.pdfIn PDF document text
    • https://rzfmuhasebe.com/userfiles/file/6224158685.pdfIn PDF document text
    • https://golf-tout-terrain.com/publish/page/file/ganamakofuge.pdfIn PDF document text
    • http://rspon.pl/images/wyswig_images/file/10580124297.pdfIn PDF document text
    • https://xenang-mitsubishi.com/fckupload/file/24547123967.pdfIn PDF document text
    • http://alternatifmedikal.com/img/userfiles/files/82375785870.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160c671c80c0b2---95101846884.pdfIn PDF document text
    • http://transsnabstroy.com/userfiles/file/sabegowogatejesul.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_off0000f18f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF18F 11120 bytes
SHA-256: 439143ade9588e7a06faf86f56faecd3c18c6e88a4696c9fd9466669633957db
font_01_sfnt_off00010b6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001237d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1237D 18044 bytes
SHA-256: d185663ecd8df9cf4f722300ea2324792b6760d233752840d2f6e42fdb24b9f6

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