Malicious PDF — malware analysis report

Static analysis result for SHA-256 65b60782242408d9…

MALICIOUS

PDF

81.3 KB Created: 2021-09-13 08:30:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f289603a1f74cf4e630cc98aa66c57b1 SHA-1: 8bf254881e02c0bc939cf416106267709b7202c5 SHA-256: 65b60782242408d9034b3da415c5b4c3b5d134448799966adbae0bab55dc415e
104 Risk Score

Malware Insights

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

The PDF 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 strongly indicated maliciousness, and the presence of multiple external URIs and link farm heuristics suggests an attempt to redirect users to malicious content. No scripts were extracted, but the overall structure and URL patterns are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://usagimatur.com/files/others/59468726465.pdf In PDF document text
    • http://grimastone.ru/files/biwebowuxuxerufuvibawavab.pdfIn PDF document text
    • http://abwlargo.com/uploads/files/xepipufoje.pdfIn PDF document text
    • http://karlsbach.de/userfiles/files/94150901991.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/161339001d8990---83595897221.pdfIn PDF document text
    • http://tehpromyar.ru/media/file/dibitetosemuvigeposiwibam.pdfIn PDF document text
    • https://alpinebadmintonacademy.com/ckfinder/userfiles/files/zipopedebavi.pdfIn PDF document text
    • http://pokewaveanaheim.com/uploads/files/nuvaretimukuviniloji.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/8a400f68f20da9cf7b3ed7105be251c3/22456780046.pdfIn PDF document text
    • http://mobilni-kadernictvi.cz/files/file/70260323721.pdfIn PDF document text
    • http://ivankotov.ru/img/lib/file/jipinimulonajenedafa.pdfIn PDF document text
    • http://3e-recycling.ru/app/webroot/filesfiles/50774685742.pdfIn PDF document text
    • https://atl-50.com/files/file/94453510759.pdfIn PDF document text
    • https://airxps.com/userfiles/files/sitezozolevanuxaxu.pdfIn PDF document text
    • http://grupopiscis.com/upload/files/30949394308.pdfIn PDF document text
    • http://an-ocn.ru/ckfinder/userfiles/files/89218831347.pdfIn PDF document text
    • http://monarchiaerembolt.hu/tmp/jozepof.pdfIn PDF document text
    • http://fijiembajak.com/uploads/ck_uploads/files/mubabiputagixuzom.pdfIn PDF document text
    • https://sklepbonus.eu/userfiles/file/18283281451.pdfIn PDF document text
    • http://studio5r.com/userfiles/files/wifanemuba.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613157c10bc41---60788755536.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6744a4e48---tokaxibus.pdfIn PDF document text
    • http://phamtrangia.site/upload/files/60535666813.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=booster+app+apkPDF 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_off0000d8d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0EB 10148 bytes
SHA-256: f0c8f9badb87912a6cd27de5355a4a5024bef7c9b680a623d4fedc161523d6cb
font_02_sfnt_off000107d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D4 18480 bytes
SHA-256: a7f665966d3222cac6084a4b9f5d335612009a83e14a6387609c4dfd9d9cb97d