Malicious PDF — malware analysis report

Static analysis result for SHA-256 3105e28f6ccf7450…

MALICIOUS

PDF

102.4 KB Created: 2021-09-05 09:02:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: eff74fc63d68b6bf4de2d2b92e0a3efb SHA-1: 31fb6f2e6303129019ea8a96da3c8afd942f93d5 SHA-256: 3105e28f6ccf74500fff4cc20c8e1bc25f622b8600fe2ef9132a0890f23c99cd
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated and unreadable, providing no direct clues about its purpose beyond the heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://newat.ru/wp-content/plugins/super-forms/uploads/php/files/9c427a6912fa0a5a9b6d1192f2668ad8/xuvufaloraturebim.pdf In PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/8624ecf4704e28747ad7730ad406a8ed/32086057757.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/7483297307.pdfIn PDF document text
    • http://www.ipkameralari24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088ee4f10d3d---vijubawemawuxuma.pdfIn PDF document text
    • https://absolut-fit-and-dance.de/wp-content/plugins/super-forms/uploads/php/files/oldpvbtmcl25ul3ojiv7qtcph4/50352254068.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078355244512---7997487869.pdfIn PDF document text
    • http://piazzademarini3ge.com/userfiles/files/sazemaze.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/tojakofusororuxuf.pdfIn PDF document text
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/16259162343.pdfIn PDF document text
    • http://karpatskiles.ru/store/files/43575056010.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b610669d825---52344198596.pdfIn PDF document text
    • http://fazekaskozpont.hu/images/upload/file/sawiwexunixi.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f533cb8f98---99962230965.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612bb4df990b6---97732863343.pdfIn PDF document text
    • http://au-coeur-du-temps.com/userfiles/file/vawemitik.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7753dec8d2---fadazuwodifid.pdfIn PDF document text
    • http://hrudolf.com/userfiles/93478885956.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae0ba09864d---wizimalozejojugaf.pdfIn PDF document text
    • https://nadamasristorante.it/file/29702588866.pdfIn PDF document text
    • https://przyklejki.pl/userfiles/52307070262.pdfIn PDF document text
    • http://www.accessibilite-salle-eau.com/ckfinder/userfiles/files/62755266802.pdfIn PDF document text
    • http://ttlh.vn/storage/ckfinder/files/loterukagumanamiterub.pdfIn PDF document text
    • http://tentimesneedlehill.com/UPFILE/userfiles/files/xosufigusudiboz.pdfIn PDF document text
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/zuzemomajebasuwosevot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=kubota+l4100+manualPDF 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_off00012d51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D51 10260 bytes
SHA-256: 592c9c41efc411b7bd82fb45e6fdff6f9992c023e39e49288b53e64ae25b5cc9
font_01_sfnt_off00014462.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14462 18076 bytes
SHA-256: 5be454f91a55558dfb9765549f29b343858294a0e85a528ae5f97d31c741382b
font_02_sfnt_off000173b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x173B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1