Malicious PDF — malware analysis report

Static analysis result for SHA-256 b38ebbd10fc5d754…

MALICIOUS

PDF

86.6 KB Created: 2021-09-23 05:27:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e731d03b9a50291d3c2090ff1b7cd37a SHA-1: e614bea4e6d6621a96fa18833080123d4a5ad3b6 SHA-256: b38ebbd10fc5d754bb9bb81e3144dc9647b934e36529db39e75e4c36f48332a5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

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 potentially compromised or disposable hosting, suggesting a phishing or malware distribution scheme. The document body was unreadable, but the presence of numerous external links and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest the primary purpose is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://sibinetweek.ru/userfiles/file/56867120827.pdf In PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613681165e18b---5228192968.pdfIn PDF document text
    • http://schokozentrale.de/idata/76707202095.pdfIn PDF document text
    • http://flirdining.com/uploads/files/texazusapaselututoba.pdfIn PDF document text
    • https://burlingame.com/wysiwygfiles/file/87389654164.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/161373a8e6b977---pikegi.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614699622c169---ralutubufekoxosipiwuvuz.pdfIn PDF document text
    • https://medbillings.us/lightspeedweb1/file/79922297157.pdfIn PDF document text
    • https://ciela13.leaddeehub.com/userfiles/files/80700534074.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/bagarupavew.pdfIn PDF document text
    • https://monyetmesum.com/contents/files/nudubetinu.pdfIn PDF document text
    • http://profstil.az/userfiles/file/konuruguboparejuzit.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144e310b2951---nekisapaselefotufif.pdfIn PDF document text
    • https://nslogisticservice.com/userfiles/files/60087206697.pdfIn PDF document text
    • http://vit-physio.de/file/17846788876.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/zubesariwigomel.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/duvusuzudepip.pdfIn PDF document text
    • http://studiotecnicoforace.eu/userfiles/files/sugakogivajugesiwur.pdfIn PDF document text
    • http://plenaseguroseprevidencia.com/fotosempresa/files/dizazuzikogorideg.pdfIn PDF document text
    • https://rajnnuhiddje.se/userfiles/file/pepifotosefufarof.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1613e267a36db6---96527692853.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/16148fd659a07f---belevejomosarowu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=cara+buat+gif+dari+videoPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d83f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD83F 10548 bytes
SHA-256: b0447aafcaf3b93c1c0f5e49c06706bd04e79d98949006d632cdbfffd7e553df
font_01_sfnt_off0000f049.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF049 16344 bytes
SHA-256: 5cd8a120e106fc2d4fc1855603a636a3ce922decfb1b4d98f17a4a5450337c58
font_02_sfnt_off0001063e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1063E 17448 bytes
SHA-256: 87fcbb6b9025a0c5e69131ceb90156da6a343c374d01c345ef0252ad9fe83e9e
font_03_sfnt_off00013433.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13433 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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