Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5c9bdf84ad62c0f…

MALICIOUS

PDF

82.3 KB Created: 2021-09-03 06:14:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d794dd58990db843a083e45e21fe6685 SHA-1: 97542734ce29e3a00e4db25422acdfb665f78b7f SHA-256: b5c9bdf84ad62c0faa84756b9d93140cc7046ecf42afd68e7ede356b824d347f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised CMS platforms or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://aymsoft.us/aym_image/files/suxanitafi.pdf In PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/65ac7b5a0a4e08d136adccce239a2b7d/24949611218.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160850b4978c0d---70855117371.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/pisijumasawupigaxim.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611cf4bc5b61c---33331211623.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/f07eb40d3b842bb5d4bae89f0e91bcd9/pibomivonifotamelitu.pdfIn PDF document text
    • http://edu-soft.ru/site/htmlimages/file/64966543192.pdfIn PDF document text
    • http://simkoongschool.com/uploads/editer/files/38169477075.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/p15jt7nns7v16sjfm91uknkf18/mogojunekutadonenofudika.pdfIn PDF document text
    • http://krr-nfe.com/suratnfe/UserFiles/File/28961633805.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/16078e923843c7---fekaronatuzulomamed.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/1vanlflvdciu7hk6f07o69h280/xasizulaxafew.pdfIn PDF document text
    • https://people11people.gr/uploads/File/perunazegofopuf.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/20535762706.pdfIn PDF document text
    • http://kk-gorenjska.si/uporabnik/file/48102133677.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/21616869547.pdfIn PDF document text
    • http://dissanna.com/temp/fckeditor/file/tinexewejokonezamasegugum.pdfIn PDF document text
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/21ms4jjm4ohq9fk1o4ueuspf0d/sigaket.pdfIn PDF document text
    • https://12shio3.com/contents//files/falopumopezuxanir.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/26in1b6bd9uao2nkf17lef1uod/tipugezegubanefoforovoke.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed27978e11---jubafimuzizof.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/53628195825.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=manufacturing+technology+vol+2+pdfPDF 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_off0000db61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB61 18040 bytes
SHA-256: 5e3cffbdbd878f4a42725c34b4d1b8e00dbe186145b8b7282322123f3241ef69
font_01_sfnt_off00010993.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10993 11124 bytes
SHA-256: 80768aa139f96f855d5ae0b7d6d0c05bf485dcb0f92424fe57c9f75366eb8268
font_02_sfnt_off0001235b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1235B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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