Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3d28207f7921107…

MALICIOUS

PDF

72.1 KB Created: 2021-09-03 07:45:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1059f4ec59cbc8f050d155a9af880d42 SHA-1: 1f42d71b88d4f90de34aea0b7d141b1eeaab6a59 SHA-256: b3d28207f7921107b6884e5f7cbd9119d0c5de650b9f1343eef77630d40d8926
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple potentially compromised websites, some of which host PDF files within WordPress upload directories. The presence of numerous external URIs and link farms suggests an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/f2e8a926661d44a690ca61538101d082/nakaganusesavotovupadew.pdf In PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf6894b21dd---90484709407.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1120ba026---20557086637.pdfIn PDF document text
    • http://metapolar.hu/tmp/85784214931.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/zekum.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160809d993912a---46927384731.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082c39cbf71b---81356041426.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/76346866191.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/35110689665.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/gubaxixolujaxulesulufaseb.pdfIn PDF document text
    • http://profil-metall.de/content/uploads/file/99244397344.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607de6497ed9c---84983983742.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f018264d55---pebotepajutis.pdfIn PDF document text
    • http://timavoshipsupply.it/userfiles/file/kugiwizuf.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6248ebbce---32429006915.pdfIn PDF document text
    • https://warsztatgdynia.pl/app/webroot/media/files/duzoxenetemu.pdfIn PDF document text
    • http://4bx.pl/public/file/sudevela.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb880d9675---vaxiwegoxuvad.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160784c433ed4b---58503649640.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/86hvjkk919r86t2h3g2bi071bn/sijivukawesavixamabupe.pdfIn PDF document text
    • http://ogcdc.org/uploads/ck_upload/files/defunerevofin.pdfIn PDF document text
    • https://sportuna.be/ckfinder/userfiles/files/25449108786.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=cea+regulations+2018+pdfPDF 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_off0000b879.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB879 11304 bytes
SHA-256: 15ea041e306343c92ec0779d7d2a613898881f528de33b4649633b0d8b9b5495
font_01_sfnt_off0000d308.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD308 15480 bytes
SHA-256: 95234bf624f6fd135a53d52c7b3701f476a80e541ab0f42361d3e5fb8c886113
font_02_sfnt_off0000face.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFACE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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