Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b519478264d7e92…

MALICIOUS

PDF

86.8 KB Created: 2021-07-04 12:59:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 29c13d72e0c46a5bdf4a9bef45856cec SHA-1: b941182ddc066a5b808f2bb5fc06a270fc751ae4 SHA-256: 1b519478264d7e9203e8d098f1b57ce86e7827ef31c20c448d2e24046b17081a
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to compromised WordPress upload directories and disposable hosting sites. These links likely lead to phishing pages or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://laborke.ru/uplcv?utm_term=in+favour+of PDF link annotation
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607685e814c65---81840226103.pdfIn PDF document text
    • https://bikeid.net/ckfinder/userfiles/files/bomodoxurutagonuvapifukiv.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/lurazodisir.pdfIn PDF document text
    • https://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/suzuvosamozisavininabuban.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c41194e0ba3---22673169008.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/bahnlmujjn88ir34ahs9hjmo82/1971292911.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/t4thehtg9re60ktkvkt8lhup1e/depoxabanizoxukafim.pdfIn PDF document text
    • http://greenplanetnepal.com/userfiles/file/pepudigiwi.pdfIn PDF document text
    • https://fallsplat.se/file/42163591869.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160739b84816d1---vinolaxipafezi.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/fdda3703fdfd4d19eb323ef47dec9d60/25408886050.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/8ls80s1be984c2ve970vuar971/bonefaxizivalodo.pdfIn PDF document text
    • https://stegopackaging.com/wp-content/plugins/super-forms/uploads/php/files/gvunmv9d8pnh3tirghsparcqe3/76086256269.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/baa0e2623d3b8d599cc2ef01d484b3a7/72477496383.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1b86622d4---juxopisaluni.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160af8909ce95f---90760461108.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/fgq7cisb1d20893iaacegdit5l/nifufujunijegefimamerelu.pdfIn PDF document text
    • http://hotelgiottotorino.com/userfiles/files/29241101264.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/5e20ceea6258c52e228b278b75404f0d/maxidabofoviwajovif.pdfIn PDF document text
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/fgq8ipgp7gmk58k3kkkgahmoev/jubukutadade.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/sozujane.pdfIn PDF document text
    • https://porterbrothersltd.com/app/webroot/uploads/vubijovuzigej.pdfIn PDF document text
    • http://hkt-optics.com/hkt/images/userfiles/file/kezefaradasa.pdfIn PDF document text
    • https://questyme.ca/userfiles/file/puditenijaxobivine.pdfIn PDF document text
    • http://donauwell.at/userfiles/file/delikutubobarejoludalo.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_off0000f213.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF213 9788 bytes
SHA-256: 87fdbc653f8a3c1226dd73a2e86567749e91cdf878a9fb76e6c0c23ff3bbf135
font_01_sfnt_off0001079e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1079E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011fb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FB0 17884 bytes
SHA-256: 1090f4a500c053b7a53fd70995a659c630bd844c6412d812d103dbfa0dd92e41