Malicious PDF — malware analysis report

Static analysis result for SHA-256 fec554095273ee91…

MALICIOUS

PDF

85.8 KB Created: 2021-09-05 10:53:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3dc72556e13ac3c3e4e14b7706daba8d SHA-1: 7972f1a96db66ab31f8b25eb2dccec09f3a5e789 SHA-256: fec554095273ee91d6c1608216d67f0901c7f4cbef35abe0a953731cd789eab3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to various compromised websites, suggesting a phishing or malware distribution attempt. The presence of external URIs and a high ML score indicate malicious intent. Although no scripts were directly extracted, the PDF structure and URL patterns are consistent with malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://laboratorioshamalab.com/userfiles/file/72525847849.pdf In PDF document text
    • https://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/d2nhe9jddudogc9rbkm6969p86/61108914070.pdfIn PDF document text
    • https://guptajimarriagebureau.com/userfiles/file/tujesas.pdfIn PDF document text
    • https://crownprolaw.com/userfiles/Proj_Name//files/43532804361.pdfIn PDF document text
    • https://virtualpulse.eu/UserFiles/file/88768214716.pdfIn PDF document text
    • http://utuin.net/files/fckeditor/file/45764712137.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160cf6c7e04a11---99666285661.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/15998881986.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610dbbf824ed7---95543397356.pdfIn PDF document text
    • http://clinical-pain.com/pds/userfiles/files/61893961218.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076ce653d108---vemerikutotajadezifatow.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/52087629995.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/wifufaga.pdfIn PDF document text
    • https://tvsporedi.si/vsebina/15372262578.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ab9e2420ef3---52007860122.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/3d19797f15926291d98725446fd97ffe/28008190645.pdfIn PDF document text
    • https://www.htlexpress.com/ckfinder/userfiles/files/zijujibetevoxosowexi.pdfIn PDF document text
    • http://konditsionery-reutov.ru/upload_picture/file/81667212550.pdfIn PDF document text
    • http://pc580.cn/upload_fck/file/2021-8-17/20210817142903309119.pdfIn PDF document text
    • http://masterref.ru/editorfiles/file/75869897232.pdfIn PDF document text
    • http://dharmapuridiocese.com/svnprojects/DHD/Source/images/files/35456069711.pdfIn PDF document text
    • https://mysilo.com/upload/ckfinder/files/26275320683.pdfIn PDF document text
    • http://hockeydh.com/files/ups/files/furunubedukegizawob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=lonely+planet+bali+ebook+pdf+downloadPDF 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_off0000e8d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D8 17972 bytes
SHA-256: ddd2d87a9e9e32fa5165895e4a6b05fff78f7b73e17a94601376924e867d66c8
font_01_sfnt_off00011732.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11732 10612 bytes
SHA-256: 37892f0f762b75748ad1387070cb20d025edae72c75a6dfb05e53a6c8a42546c
font_02_sfnt_off00012f64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F64 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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