Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdea689a02598e02…

MALICIOUS

PDF

73.8 KB Created: 2021-09-20 00:50:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 220ca5b0a225b0c87602bb7d00fb359e SHA-1: c4818425e05bbe2595a45f6beaa6efb4e74e6c68 SHA-256: bdea689a02598e024610096e8fc545809b4913362a2898efa1005059fa7daa20
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to multiple external URLs, with several hosted on compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, but the heuristic firings clearly point to a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9939

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://sklepbonus.eu/userfiles/file/90685834093.pdf In PDF document text
    • http://abbeloosschinkels.be/userfiles/file/noradokopagugafub.pdfIn PDF document text
    • http://architettoseneca.com/userfiles/files/32402976097.pdfIn PDF document text
    • https://www.whoamiandwhyamihere.com/ckfinder/userfiles/files/kijubezovigutu.pdfIn PDF document text
    • https://zzwgjx.com/d/files/pitadexivirepazenoxiju.pdfIn PDF document text
    • http://distant-property.ru/fck_editor_files/files/verigififenisaf.pdfIn PDF document text
    • http://oasis-inwaste.asia/files/file/99430206397.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e512d41f17---zevotasudexulasaget.pdfIn PDF document text
    • https://www.asoriofrio.org/ckfinder/userfiles/files/zutolefizakuvogiz.pdfIn PDF document text
    • http://mediaworld.pro/ckfinder/userfiles/files/repalisiboso.pdfIn PDF document text
    • http://malopolskiszlakwinny.pl/upload/File/dopebefux.pdfIn PDF document text
    • http://nuk-amro.de/userfiles/file/54135360915.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/bpr3kg77l336f0s5dkddphmikn/72804157343.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/pafepevadopezowanakusati.pdfIn PDF document text
    • http://kimsanghun.com/upload/userfiles/file/2021916152427697.pdfIn PDF document text
    • https://sapporomn.com/userfiles/files/gutagowab.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/r2u2rm5jhcv0fc2uq1nhoe75c0/39561819771.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/ekcpua1n0trr3h65lcu3k52rq7/92656176426.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/24376c2421544e9744fbe0c01fdeeac9/5552464639.pdfIn PDF document text
    • http://ngnjl.com/userfiles/files/63540214314.pdfIn PDF document text
    • http://ourpreferred.com/userfiles/files/16360848281.pdfIn PDF document text
    • http://vaonhaphatphap.com/images/uploads/files/bokubazewoximirapuloras.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/1e66a3ed67c91bdd18d96a7deac10db8/boponuk.pdfIn PDF document text
    • http://balmybnb.com/t/tutorfirm/uploads/ck/files/gaborovokopuvexatolopu.pdfIn PDF document text
    • https://egokituz.eus/files/galeria/files/nomozizuxirifefosivut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=video+to+mp3+convertor+onlinePDF 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_off0000bf71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d788.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD788 10552 bytes
SHA-256: 68bc50b8c2b09b8fd37bf8adf3384a31baf46995f42b77b13baf2fe10ca7b50f
font_02_sfnt_off0000ef89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF89 16120 bytes
SHA-256: 00093b5161d672c1fb483359eb754712becb7736f39f59cafa791ddd73789963

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