Malicious PDF — malware analysis report

Static analysis result for SHA-256 079fdd71c3a3b597…

MALICIOUS

PDF

92.4 KB Created: 2021-07-05 04:05:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bf2f96c2652f9add605c7064b113af52 SHA-1: c223e0b1ada5de506b2a327da78656a52ebf7ecf SHA-256: 079fdd71c3a3b597106525d675d294d6965c125bca6bf967f8095e31c9170127
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to potentially malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9876

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://newat.ru/wp-content/plugins/super-forms/uploads/php/files/c6ebb643704757adbc873b4bed6532ef/8389601816.pdf
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/61dd920a451a479004d925b29262db80/26422963044.pdf
    • https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070a83ab833e---dobisurumo.pdf
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160904e623332b---tipaledufotarakak.pdf
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/6bb327f3a43ed5113bb085a3683c31f3/48575991964.pdf
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608d7db3b1533---31608182250.pdf
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8dff62a839---rixexawinaboxumofuf.pdf
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/96e345553dbe8c1fb9830e6fb309569d/noxobezuguzagepikuge.pdf
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/6fe1c3558f4e32fbdbb8eccdebd89426/99795427464.pdf
    • https://fourseasons.events/wp-content/plugins/super-forms/uploads/php/files/5b838677e7a2d46f66ecbaab8adc303c/wosipatadum.pdf
    • https://anyimaker.com/upload/users/files/pakotopatunavejodilaxoziv.pdf
    • http://dynamic1984.com/user_file/file/wimuxodedulesazikagivem.pdf
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/ce1a20194d9d480d8ca98317869ca995/39432452325.pdf
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160898057cd49f---88569304213.pdf
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609839f511428---pebuzuza.pdf
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/91de648efcc3e35c83e56c90c36d7e7e/26738353265.pdf
    • https://mnlex.it/file/3280508276.pdf
    • https://hijaulumut.com/contents//files/44433485714.pdf
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ac10f8199da---65552560313.pdf
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/21badb229379c4e3d62d459b939a99ff/92915228344.pdf
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16091c7d63e025---72357906402.pdf
    • http://boldogelet.hu/media/lodexafosegirigufetuwamuv.pdf
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d67b8407fda---lebizofijenosi.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=ca+drivers+written+test+answers
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010ce9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE9 16792 bytes
font_01_sfnt_off00012500.bin
aa68453ce98d439d0d6c70cac01c2267bbe9b823acfb0d7396ed9a0b16c0f1a1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12500 10256 bytes
font_02_sfnt_off00013c3b.bin
6e4d470de6463dc0833b4500e8d6f5afadd677d4d3c86625f573e292772be822
pdf-font-stream PDF embedded font (sfnt) at offset 0x13C3B 17460 bytes