Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d4e6cf0a70fb047…

MALICIOUS

PDF

93.1 KB Created: 2021-09-09 11:05:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 60cf4dbb2d4a5f0a3e938b4c3b7e2ac8 SHA-1: 87916198589bac7b40e34636efe2ccf107f68db7 SHA-256: 1d4e6cf0a70fb0474e58699b3707932e8c154e87d0dba346f7bc76181495eb8e
96 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to direct users to potentially malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

Heuristics 5

  • 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://sdtrafficticketlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xejubisexuj.pdf In PDF document text
    • https://used-machinetools.ro/app/webroot/files/userfiles/files/37641692426.pdfIn PDF document text
    • https://peoplesmodelinternational.com/ckfinder/userfiles/files/80259003724.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/soruxedodun.pdfIn PDF document text
    • https://inprovitcaribe.com/ckfinder/userfiles/files/rotifokizajepuw.pdfIn PDF document text
    • https://dallaslandscapedesign.com/media/files/falotigiwarovazedilurotal.pdfIn PDF document text
    • http://wakesup.org/userfiles/file/43634588770.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16134d5ef8093a---xodofapulolawawiwutiwotu.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132b54a28f43---34735346882.pdfIn PDF document text
    • http://natalieshuff.com/uploads/file/65185753320.pdfIn PDF document text
    • http://sbs-group.co/userfiles/files/posalifosikanid.pdfIn PDF document text
    • http://inarchengineering.it/userfiles/files/guwajogeli.pdfIn PDF document text
    • https://selapro.com.au/application/third_party/ckfinder/userfiles/files/xizetofomujuj.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138e17e5b7fe---72154281103.pdfIn PDF document text
    • http://kiko168.com/UploadFile/file/20210907092813519.pdfIn PDF document text
    • https://ladangmimpi.com/contents/files/felaguzemedo.pdfIn PDF document text
    • http://www.pvvc.cz/files/mogakem.pdfIn PDF document text
    • http://cppzone.ru/users/blogs/file/dujikonopikijaz.pdfIn PDF document text
    • http://catherine-massage.com/ckfinder/userfiles/files/mobumudaxuwufamot.pdfIn PDF document text
    • http://mebel-moscow.com/content/xuploadimages/file/litinigumasibodojum.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16138f04e8c879---potutamelugosiwu.pdfIn PDF document text
    • http://mariekevanvlierden.nl/survey/userfiles/files/81136676112.pdfIn PDF document text
    • https://hunde-katzen.at/soubory/xojokuvigajopusob.pdfIn PDF document text
    • http://www.hussco-steel.com/husscofiles/files/kusegefilogolonetajigure.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=live+sport+tv+apk+2020PDF 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_off000108b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000120c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120C8 10452 bytes
SHA-256: 1b2d4534952063735df1a7d9c9c0e5ab7dc87a91381ee980ecb5b8418a5c13b7
font_02_sfnt_off000138c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138C2 17864 bytes
SHA-256: 16047f58f7965c2217471a13fc006536abf1bc36f1e7e6f32dc15f515bbe40dd