Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1d04f7e0f3607d6…

MALICIOUS

PDF

84.9 KB Created: 2021-09-12 09:24:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3eb4b69e7a5d32ca91c3dfb5a3da2ebf SHA-1: 3f6c026431e6e26b53ceafc0e15324cd26b98d6a SHA-256: a1d04f7e0f3607d6309f715d034a7722f747fa9b9cf66e3d43078af78d5bf7fc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that point to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to potentially malicious or scam content. The PDF's structure and the nature of the URLs strongly suggest a phishing or content-luring attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://coretry.ru/uplcv?utm_term=a+court+of+silver+flames+read+online+free PDF link annotation
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16131dc6cf2592---xarizemejegiwo.pdfIn PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/32182273942.pdfIn PDF document text
    • http://www.css-jp.com/upfile/files/2021/09/10/gajidevugugifufuw.pdfIn PDF document text
    • http://montex.pro/uploads/userfiles/file/sowuwoviju.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d9158c94bf---23547469241.pdfIn PDF document text
    • http://neoneophytou.com/ckfinder/userfiles/files/temopebikudewoxod.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/dopaviramirefaderamen.pdfIn PDF document text
    • http://silky.ae/images/bulk_images/files/61976669255.pdfIn PDF document text
    • https://pelicanfinancialnetwork.net/ckfinder/userfiles/files/91453665110.pdfIn PDF document text
    • http://katela.net/userData/board/file/gexejilawafalagadadube.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613378231e433---88605296842.pdfIn PDF document text
    • https://vegan-eshop.cz/data/file/petokobapubuwuvemurekuf.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/8fbb34b18cdeea86caae06224c2d0f42/4472235658.pdfIn PDF document text
    • https://printjet.pl/pliki_user/File/sexilelisope.pdfIn PDF document text
    • https://snowcat.pl/admin/ckfinder/userfiles/files/pidoruvoxebavukolazuviker.pdfIn PDF document text
    • https://bliznacite.dvsportbg.com/files/zusirosovapekalezus.pdfIn PDF document text
    • https://taucaotoccatba.vn/images/news/files/41224184150.pdfIn PDF document text
    • http://wordtmann.beckbauer.eu/ckfinder/userfiles/files/66689444409.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/tudaxobaviremetitud.pdfIn PDF document text
    • http://geodavidepini.it/userfiles/files/gipadelijuxugefumukazubef.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_off0000e2a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A0 10784 bytes
SHA-256: cc458ad644782698bd918321432c7585362a46a9a295e6347fa8ade35c065fd9
font_01_sfnt_off0000fb83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011395.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11395 19196 bytes
SHA-256: b2873da42af7d0e81afa28772cf123aba458b2de4c1a82f14ff6abe18098c1a8