Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bca1478dfda5bb0…

MALICIOUS

PDF

97.1 KB Created: 2021-06-28 17:15:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: f33bedecafdee7bc673ceabc35cc3e33 SHA-1: ef6a7fd6f033ce32d7faf6bf37ba18908a25c7be SHA-256: 2bca1478dfda5bb0b7a7849a52090b9fda63029a48f44421533d27f15078e9d0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://krisoc.ru/uplcv?utm_term=method+of+diazotization+titration PDF link annotation
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607bcf3c098a8---bepoxizip.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/21688539736.pdfIn PDF document text
    • https://maggies-handmade.com/UserFiles/files/23380324906.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b5749b1863b---dozibexijamafawakezemu.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/defigivuguziru.pdfIn PDF document text
    • https://aprenda-atdi.com/uploads/files/54232213825.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a33d07e2477---8540236463.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2a5e126714---rokajuliz.pdfIn PDF document text
    • http://studioguatta.it/userfiles/files/guwotiguxijexewixumijof.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/306g1p7atokpnollghgsb08njk/sawutam.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/a0d64644a5b6de5cec4d6b656134ebcd/ruxavudibufonozuvalidudew.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608052bff36e3---vuvagaxofivelopi.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/3fba5f3c7dc489b6a6fb7638f3ec3242/fokelimo.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/11dc97d66e421f0d7dba7803c735774f/gibugamopetijixujete.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/3f8ea0963d5f31afb62188e6f7b2c3f2/sunironiv.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/xozizitugifilod.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba62d153abc---26520290078.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607818ca4655b---91629324275.pdfIn PDF document text
    • https://paperland.bg/uploads/file/86250513561.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/e2826fab5c72c4f6bacadebcb2aa7608/sosakuvigipinisavesifudog.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/5bafj9e3ga3k7mfhdlskai9p1h/53463099147.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc72629a8db---87633825968.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_off00011531.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11531 19140 bytes
SHA-256: d4122d0716fc774d8fb3f124812919ba7e56a2f4bacf9e488db1857fe34937fc
font_01_sfnt_off000147fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016012.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16012 10292 bytes
SHA-256: d7b5eaf1cf9ac0978fd32c241b4c5843126864c0e9972c7af9b3367870cffe06

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