Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4d4a826cac934a3…

MALICIOUS

PDF

90.3 KB Created: 2021-08-26 05:18:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2013e7da0a931e519dc294f993d3e2e4 SHA-1: eb4c5225d7cb1c8c7709526f063dc847c1f6def0 SHA-256: d4d4a826cac934a37c8031db4af0f572db35c4ca6f1d2fec542b518936c99b59
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were directly extracted, the PDF structure and embedded links are indicative of a malicious document, potentially leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160920d966bf3e---vevefiz.pdf In PDF document text
    • https://10kshot.com/customerinterview/ckfinder/userfiles/files/wowofaniseragagifilisip.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/tikavebojaxadegina.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/8at8vhia977p7m898qsh5rmpgl/bedofejami.pdfIn PDF document text
    • http://ehs1958.org/clients/73155/File/50356497172.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/e6878sb8msgmtnr59e06267m5c/77412577254.pdfIn PDF document text
    • https://classconnbio.com/img-jacson/files/97008282159.pdfIn PDF document text
    • https://uleshuzatabc.hu/files/file/5404877009.pdfIn PDF document text
    • https://wickedcheesy.com/images/file/33048035467.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/fe0f2d17e90cd1c4ffc0ebe4ebf61d69/zemopuw.pdfIn PDF document text
    • https://roweryelectra.pl/app/webroot/uploads/file/16250513862234.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fcc0f59656---94154701839.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/cb8e97bd6bc4597ddc705386492474a1/zepovakowosikosunenegak.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/nuterujibovuvezobugo.pdfIn PDF document text
    • http://sieuthivatlieuhoanthien.com/upload/files/74985407885.pdfIn PDF document text
    • http://monterroso-construpuntos.com/campannas/file/35633651426.pdfIn PDF document text
    • https://micsys.in/userfiles/file/22062798580.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/58209471665.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160fd16565275e---dumudimogifufebe.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/08b9686be7e694b2bdf401956650cfe4/30402596570.pdfIn PDF document text
    • http://bsp-plovdiv.org/ckfinder/userfiles/files/43417955685.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607415febb953---6406702149.pdfIn PDF document text
    • https://zzarosiscarampola.it/file/99464731811.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d78445a4386---mopakizeka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=cost+and+works+accounting+tybcom+mcqPDF 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_off0000fbe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE4 17056 bytes
SHA-256: 05ec508e31abb1161f74d95fc072531a6e6b8ed97182a63c267bffaf8ab346f3
font_01_sfnt_off000128d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128D0 11244 bytes
SHA-256: 56f88afd28de4eafa68d56dd6e0e82f7d0b8c061b1169f771adcc700363469dc
font_02_sfnt_off000142cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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