Malicious PDF — malware analysis report

Static analysis result for SHA-256 f349a0d585033231…

MALICIOUS

PDF

87.0 KB Created: 2021-08-01 13:52:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ecf8de511eb9cbecae9a98789ba07e93 SHA-1: 3a664fdf3c1b9ee0d4d543d7d15e740fa76e7f3e SHA-256: f349a0d58503323144707663186a5516fda6f8d55f1de4093f24472bc77f06ec
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Several heuristics point to the document being a link farm hosted on compromised WordPress sites, directing users to other PDF files. These links are likely used to distribute phishing content or further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/fb0ff8766881f138d03292d76b848014/49500108041.pdf In PDF document text
    • https://hogies.com/includes/template/uploads/file/sokoniwusawakeve.pdfIn PDF document text
    • http://sumterhigh89.com/clients/863574/File/kokatafuxizojegidafifut.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/6825904163.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/1n2gm9sf49ev3df90d3vo5al7v/kevefaw.pdfIn PDF document text
    • http://fairway.cc/images/blog//file/61798658851.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e3f9a08f0f8---jidiretuxum.pdfIn PDF document text
    • http://sanga.asia/userData/board/file/61853767326.pdfIn PDF document text
    • http://tetobox-budapest.hu/uploads/files/jomoxibodupeneko.pdfIn PDF document text
    • http://tapestry.cz/images/file/files/20165769890.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/f8c03b6182d6cd5c1bdd062447754c08/gavovalojedojiwinazezi.pdfIn PDF document text
    • https://demetraproject.eu/ckfinder/userfiles/files/silozidepuxakimamodozesup.pdfIn PDF document text
    • https://rumputhijau.com/contents//files/nanugelekimam.pdfIn PDF document text
    • http://summitremodelinginc.com/userfiles/files/44320156640.pdfIn PDF document text
    • http://dekoblickfang.de/userfiles/file/9706941720.pdfIn PDF document text
    • http://exosportsante.fr/ckfinder/userfiles/files/wumovafutati.pdfIn PDF document text
    • http://jurabos.nl/include/editor/file/50688667397.pdfIn PDF document text
    • https://cafesca.org/ckfinder/userfiles/files/38386571606.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ddac7501abb---12756756116.pdfIn PDF document text
    • http://www.petercar0937494634.com/upload/img/files/26221369101.pdfIn PDF document text
    • http://china-hold.com/UploadFile/file/20210628032228087.pdfIn PDF document text
    • http://etoprosto.ru/ckfinder/userfiles/files/94010945795.pdfIn PDF document text
    • http://msamericapageant.com/clients/873634/File/nagugopalututiburojujige.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=como+transformar+j+em+kwhPDF 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_off0000ebb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB1 10680 bytes
SHA-256: 28f2e07539f68785fd17066101a88128cc50322b40ff6b970285484db1991507
font_01_sfnt_off0001041f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1041F 19344 bytes
SHA-256: cd45ed9f23b5cf9197392c7fc897c5b15b7f66664acf7b2bbc091f9af99a4bae
font_02_sfnt_off00013396.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13396 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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