Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fde1da85f5d528f…

MALICIOUS

PDF

85.6 KB Created: 2021-09-03 17:36:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 003919b9ffebcabbd5c825e7d4184ec3 SHA-1: b5a62d83c6e2c7c7f2ffe6082a642b48ba99d7d1 SHA-256: 2fde1da85f5d528f125fa26b982d6a647ee46afbc7413e733bc38f1a97f1341c
96 Risk Score

Malware Insights

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

The PDF contains numerous links, many hosted on compromised websites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier strongly indicated maliciousness, and the presence of multiple PDF link farm heuristics reinforces the attack pattern of using compromised CMS uploads and link farms to distribute further malicious files. No scripts were extracted, but the overall structure points to a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://hanurichurch.org/ckfinder/userfiles/files/mixom.pdf In PDF document text
    • https://calmoinc.com/upload/editor/file/vasoso.pdfIn PDF document text
    • http://zoltysnieg.pl/pliki_wyswig/files/wasigonujewisokirogijo.pdfIn PDF document text
    • http://hkacca.com/userfiles/26731790345.pdfIn PDF document text
    • http://www.atccs3.it/atccs3/fckeditor/editor/ckfinder/userfiles/files/zedawudarosewuf.pdfIn PDF document text
    • http://jedwines.com/cmsCart//upload/file/82536280700.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ccb0562d14---nonepazopadodemur.pdfIn PDF document text
    • http://piazzademarini3ge.com/userfiles/files/kelilumevozab.pdfIn PDF document text
    • https://xn--arbeitskndigungsrecht-best-5zc.de/userfiles/file/45147402081.pdfIn PDF document text
    • http://ulv-fogger.ru/d/files/72667803740.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/80837340945.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088f14f0f651---gibaviwuwagufabef.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/0fm736m9dpt27bl4a4rmbaoshi/xowofavexixulaxewomateg.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/1b5s3ifq9e8j5l3favt9dnhvrf/11200492574.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/2b0cddf657481dbb5e663175310a034b/40700250649.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/jrt7b89ibik3c140ei9c4llfak/88461656071.pdfIn PDF document text
    • http://babamoleskine.com/files/file/40256229835.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/gilemiledipiris.pdfIn PDF document text
    • https://kocarbonag.com/luutru/files/wufokezadexixekoxokol.pdfIn PDF document text
    • http://josephfellerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/69154757874.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608138fcafc3d---61029870476.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b0e5a8ae83f---42047747518.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/a79fa7f0d2db5393ab1fb3d009a818ef/gulowowuzapavozekar.pdfIn PDF document text
    • https://hagepoorter.be/files/files/mufobiza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=ziarat+e+jamia+sagheer+pdf+downloadPDF 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_off0000df69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF69 11124 bytes
SHA-256: e805ee57f253c2071a2e43179a89bcecba013171bde7de8002d24cac6888593f
font_01_sfnt_off0000f909.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF909 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001111b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1111B 21468 bytes
SHA-256: 63a710f4a4a80094bc052b8642487caddeb346afee3d3e10aa1c82aaa7c730b0