Malicious PDF — malware analysis report

Static analysis result for SHA-256 393c22460c63ba05…

MALICIOUS

PDF

79.7 KB Created: 2021-10-08 22:49:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: be385599e8fee872d117de432ecdb862 SHA-1: bed9c453c3a0596f260af2331ca8c97c5f9cc4df SHA-256: 393c22460c63ba05b043cb527db7ecd24e3a1215721bf869ecd2d3e82ffac063
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm with numerous URLs pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of multiple external URIs and link farm characteristics suggests an attempt to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://fertilizerproductionprocess.com/d/files/67596733038.pdf In PDF document text
    • http://magyaringatlanadatbazis.hu/dev/_user/file/25691430106.pdfIn PDF document text
    • http://bytip.net/filespath/files/20211002181126.pdfIn PDF document text
    • http://slkuang.com/v15/Upload/file/202191499288298.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141692a5c66d---joxozomusidenevur.pdfIn PDF document text
    • https://apsco.ly/userfiles/files/fovalokimuwugejamuve.pdfIn PDF document text
    • http://gs-metals.com/filespath/files/20211004214723.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/1615c489581337---22142357178.pdfIn PDF document text
    • https://endobible.com/userfiles/file/27311918094.pdfIn PDF document text
    • http://kondicionery-elektrostal.ru/upload_picture/file/67559914591.pdfIn PDF document text
    • https://gsm.company/ckfinder/userfiles/files/xosegixogobomomix.pdfIn PDF document text
    • http://sbcnepal.com/images/file/xodinimuboxitukapujiwaku.pdfIn PDF document text
    • http://daiquangsico.com/img_duhoc/files/viremepali.pdfIn PDF document text
    • http://www.parinet.fi/tiedostot/files/resofodat.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614bcf8f695af---12430388251.pdfIn PDF document text
    • http://elosc.com/upFile/file///ITX202109141934462443.pdfIn PDF document text
    • http://canavesiobruno-architetti.it/userfiles/files/24969233466.pdfIn PDF document text
    • https://krzczonowice.pl/gfx/file/suzenilemoz.pdfIn PDF document text
    • https://orrizon.ru/images/file/70375650078.pdfIn PDF document text
    • http://www.smartusb.info/images/library/File/67136660166.pdfIn PDF document text
    • http://villapellegrino.it/userfiles/files/fokaparaledoduti.pdfIn PDF document text
    • http://plaschke-partner.com/uploaded/file/24632467953.pdfIn PDF document text
    • http://pusancard.com/userData/board/file/65244685024.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=large+maggots+in+compostPDF 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_off0000d4fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4FA 10628 bytes
SHA-256: 1f95816f88abc583a43ec5ae19f1f81f99fd632c2af4d7c8f6ce2947e470caa9
font_01_sfnt_off0000ed49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED49 17284 bytes
SHA-256: 35603613ee3910ebd0b021b29a9b848ab1f261b58f7d8f1864d7fa8ccfb7fcda
font_02_sfnt_off00011984.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11984 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1