Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed1bc60b88e6cf7f…

MALICIOUS

PDF

83.6 KB Created: 2021-09-04 23:06:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8cb9a66fc4fc574aac13aeb81b977948 SHA-1: 0504d121c0910f8e65285acf90f4700d817800ea SHA-256: ed1bc60b88e6cf7fbbeb63bc6794ca14ea192fff882599ed876c875e58bc9fb1
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites, likely to distribute further malware or phish users. The presence of multiple links on disposable hosting and the use of UTM parameters suggest an attempt to obscure the true destination and improve search engine ranking for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b03011d6a03---wizolisereno.pdf In PDF document text
    • http://walthamclassof1985.com/clients/5/52/52060312c10aa816a718e90a19a6a7a1/File/45026751678.pdfIn PDF document text
    • https://imperfettoristorantino.it/file/1491246907.pdfIn PDF document text
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/gagom.pdfIn PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/71596203007.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/5bf5727320b1049d6c1e9482db008fb5/84176827979.pdfIn PDF document text
    • http://kerama.altrodesign.eu/ckfinder/userfiles/files/gaxelakikevid.pdfIn PDF document text
    • https://sahyadrisevasanstha.in/userfiles/file/nalobibesebonulole.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a0fbedbdc71---bulewebizerodogiduw.pdfIn PDF document text
    • http://teplospectr.ru/images/files/valuperozigiwi.pdfIn PDF document text
    • http://wolfroccatiassociati.it/userfiles/files/76106903987.pdfIn PDF document text
    • https://stef-nancy.fr/upload/document/34009655153.pdfIn PDF document text
    • https://rrr71.ru/upload_picture/95116794042.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/qu2apk8aifm8sr2rconk612fn7/69788178975.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adb8ba82596---5064018940.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca208e4430---48360491157.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160f1fefd58b13---62701324573.pdfIn PDF document text
    • https://cristalensi.com/public/File/74584090733.pdfIn PDF document text
    • http://myphamasia.net/upload/files/67640967921.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7c16d1c65f---27196269234.pdfIn PDF document text
    • http://group-anons.ru/userfiles/files/nizodelazukam.pdfIn PDF document text
    • http://www.domplit2006.ru/ckfinder/userfiles/files/77522349307.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/zosupakemix.pdfIn PDF document text
    • http://fkjz.cn/upload/files/2021/08/202108091241308359.pdfIn PDF document text
    • http://southport1969.com/clients/861680/File/11288303408.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2e7444adc---tafexuzazoxikibamowe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=times+table+maths+worksheetsPDF 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_off0000e07f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE07F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f891.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF891 18428 bytes
SHA-256: 3246c62d0592c6891fdeea6fcdd320cf7a37088012e34d719dc27f2ad643583c
font_02_sfnt_off00012881.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12881 10552 bytes
SHA-256: 7a19e14c41af781a68def78b2593bcdc0a0b684e0437839ccbc65b899d03d65d

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