Malicious PDF — malware analysis report

Static analysis result for SHA-256 92917046881f2094…

MALICIOUS

PDF

100.8 KB Created: 2021-07-07 18:37:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 12684fdffe7dda3f9ce8ca1747b7280c SHA-1: 4602badbb9da48003328d6349d536701c1c56e44 SHA-256: 92917046881f2094f0fd35a31b153d5fbe313385a26c5819acce1813de54e8cf
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to multiple distinct hosts, many of which appear to be compromised CMS uploads. The embedded URLs suggest a pattern of directing users to external resources, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

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://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/357ccad5d3e3dde6e844d5ca44944609/timuvajim.pdf In PDF document text
    • https://grandplaza.bg/uploads/assets/file/90130942696.pdfIn PDF document text
    • https://aiwatopup.com/ckfinder/userfiles/files/kateres.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/764fea6f04dcc60577ab2db03e7106b9/pikemitusesetotixeludon.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c33d15e64f---37584467373.pdfIn PDF document text
    • http://project-st.ru/userfiles/file/rilafeduvamuwonefapalu.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bbb8af2b000---rijobevizepegudozet.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/dusodix.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074366be140b.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/duposi.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/91io2rk22gj9u5n3e4lr9le4t4/46910775039.pdfIn PDF document text
    • http://sieuthivatlieuhoanthien.com/upload/files/lixitobibos.pdfIn PDF document text
    • http://www.deewanalarab.com/up_imgs/sukukivugazojub.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/7ffa389ef0b223e63fe5cc6ca7fc22d4/34906783994.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bc62518f992---71987657132.pdfIn PDF document text
    • http://119hero.kr/userData/board/file/23686896924.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/31832027298.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160729c99a9bbc---59638400319.pdfIn PDF document text
    • https://zold-kommando.hu/files/47367236550.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce20486aa2---1893375893.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b5bc33a8820---67583626621.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/golizigitofixanunuvetob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=the+king+2019PDF 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_off00012978.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12978 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001418f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1418F 10208 bytes
SHA-256: 056ee58afe8bb8815e3e97eb344fb910238928667712a0d1a5179c76e44b3611
font_02_sfnt_off0001586e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1586E 17460 bytes
SHA-256: 47cbf3dbdea2e9115fe513be996f93489a1ebf9c5688b54961238eda8f5444a8

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