Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fb88827a16d91e4…

MALICIOUS

PDF

82.7 KB Created: 2021-09-05 21:46:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e34d57218d3d294b283ab9f01c7a0625 SHA-1: 860e084f39531ac59fd0a9cf318b37cc82120147 SHA-256: 5fb88827a16d91e4c9477be02a88b6a4f1ca5053921a00f81448c0dac7b741fb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and links to compromised CMS uploads, suggesting it functions as a link farm to distribute phishing content or malware. The PDF structure and embedded links point towards a spearphishing attachment delivery vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://nomylo.ru/uplcv?utm_term=printable+disneyland+map+pdf PDF link annotation
    • http://g-shocktou.com/user_file/file/duzabevis.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/280029338395.pdfIn PDF document text
    • https://northwestconvention.cz/data/files/gogetedezariguf.pdfIn PDF document text
    • https://giverny-bkk.com/upload/files/relikusuzaparejafebiri.pdfIn PDF document text
    • https://menu2uplus.com/images/file/bixibalizilotevi.pdfIn PDF document text
    • https://triosms.com/userfiles/file/zudapeli.pdfIn PDF document text
    • http://werder-ritter.de/UserFiles/File/sifufekupojepajonukaze.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/0e9d4e1ce1da807f5a9138f55dbdb976/35123719933.pdfIn PDF document text
    • https://mbbs.hr/files/46328686902.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16106c11119923---tuwafoxivavenevekif.pdfIn PDF document text
    • https://bistakalikotenetwork.com/userfiles/file/luzovenarebab.pdfIn PDF document text
    • http://giasuthienphuc.com/Images_upload/files/konuxubepaku.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/ecvigeqgnmjqf6qq08fpi9i9st/wopoxinawinowotakoli.pdfIn PDF document text
    • http://chiangmai-clean.com/user_img/files/60778223777.pdfIn PDF document text
    • http://faradtvandor.hu/picture/userfiles/file/dudupumiroropinedinufex.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/7edcb3984c13acb493729a2ad5847a30/tusefonokixekifunafelikux.pdfIn PDF document text
    • https://heritagecambodiatravel.com/userfiles/file/30643559543.pdfIn PDF document text
    • https://codecs.roimages/file/suzuvujewijifagatonun.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090b7123a109---fubesetenojenazum.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607725a74de4d---jokotagagigijawufubike.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5a349c613---84016571907.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/cde2104ca21b18ef55dd633f56167970/43409683627.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/33091728665.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/wutoz.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e082.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE082 10792 bytes
SHA-256: 4834a479fe599809c3d877a87d8b62ca9d84ae287746409dc981d90d52181af0
font_01_sfnt_off0000f921.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF921 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011133.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11133 16900 bytes
SHA-256: 5bdeaa609bd3040f2fcf552994464fdfa1b492fff2cb8bd3771c5f5873590e1e

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