Malicious PDF — malware analysis report

Static analysis result for SHA-256 12f75e1cb6d44394…

MALICIOUS

PDF

84.9 KB Created: 2021-07-07 13:44:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: e808b3deff0719371a0f618b4aa03878 SHA-1: 5b7ee69791d499b229ef1b44624e4385dec38d1a SHA-256: 12f75e1cb6d44394c9abef7fbd4681dab2a4fcba3553bad357ab1b8d05bd2274
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links pointing to compromised websites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The presence of external URIs and link farms suggests an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://archism.ru/uplcv?utm_term=the+atoms+of+copper+contain+electrons PDF link annotation
    • http://opusincertum.it/userfiles/files/kojoweluneserifawir.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/zuwelumowoni.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b732ea3c51---43907868909.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608116d40d4de---mananulozudupizijolupop.pdfIn PDF document text
    • http://pronobile.de/catalog/file/xitinedegunupudam.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/ul4bipijvagam50gqc97j1cldb/16107082540.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/51afbe3d569e77329c528d2f3adfdf49/jesosun.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c89aee3b080---wesukilubovitoxuxo.pdfIn PDF document text
    • https://mzlpro.com/web/img/podborky/files/mitewapiwuxomog.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c822bc3140---lekokubijire.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-7-7/20210707083351138097.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/vozalivilegivizojevejas.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160b4a09168f72---warixodebarogasinakaxafov.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/98618500091.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/94084946807.pdfIn PDF document text
    • http://motivationandmomentum.net/ci/userfiles/files/16470925435.pdfIn PDF document text
    • http://wheatland1971.com/clients/25033/File/sekomajularekixafures.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16088a37c8339d---ripijatokisi.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/66571335411.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/94732197264.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/94637853570.pdfIn PDF document text
    • http://aloeverajuice.cz/files/file/6500512087.pdfIn PDF document text
    • http://apogeeconsultancy.com/upload/files/36428660725.pdfIn PDF document text
    • 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_off0000ea2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA2E 16764 bytes
SHA-256: 0fcab7cbaa8f19831f5d7cc126571f122e2fc00432625c64c458932d634f3741
font_01_sfnt_off000115da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115DA 10708 bytes
SHA-256: 03ef58458415e9c1c20372dc9def232d9c606bc3487095869129e0b734a8622b
font_02_sfnt_off00012e44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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