Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc81970bf8430b27…

MALICIOUS

PDF

70.2 KB Created: 2021-10-04 09:05:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 034f47d2afc32f6fd30b45847a867998 SHA-1: cc967beb45c53f9b850c610216e982d8b5d0eea5 SHA-256: dc81970bf8430b27c84986e4b45a27f45b12d40a99b58e85269fac4bcb7bc489
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised WordPress upload storage locations and other disposable hosting sites. The embedded URLs are designed to lead users to potentially harmful content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16158d27c130ff---47615533683.pdf In PDF document text
    • http://studio-castiglioni.com/userfiles/files/zulipovobebo.pdfIn PDF document text
    • http://technocom.pl/editor/file/ximidiw.pdfIn PDF document text
    • http://mebizstekla.ru/userfiles/file/12164033729.pdfIn PDF document text
    • https://ecohort.info/userfiles/files/zobesarenij.pdfIn PDF document text
    • http://burattinojatek.hu/userfiles/file/64465441631.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1615608df20c61---xigiwemufelerevelanebe.pdfIn PDF document text
    • https://vrindaindia.com/php/joseph/uploads/file/potub.pdfIn PDF document text
    • https://jurvamartin.com/userfiles/file/84450023806.pdfIn PDF document text
    • http://project-lovcen.me/userfiles/file/pepelizamowalejodunizav.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/e6a465218eaba50494d2769f5bd5179c/42547960751.pdfIn PDF document text
    • http://gartenmessebau.de/uploads/files/6274554015.pdfIn PDF document text
    • https://granitabrasive.hu/editor_up/tobozupumelejegumodorowob.pdfIn PDF document text
    • http://trungtinjsc.vn/upload/FCK/file/65161910084.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/23521213256.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16157f78a3d3eb---golavepugadiz.pdfIn PDF document text
    • http://www.americaninvest.net/upls/files/tupelozotabupel.pdfIn PDF document text
    • https://gangnampools.com/contents/files/76314960588.pdfIn PDF document text
    • http://thecuriosityshot.com/46457744082.pdfIn PDF document text
    • https://khabul.mn/mmpa/userfiles/files/49874900269.pdfIn PDF document text
    • http://surausa.com/uploads/files/lawejimoboxasib.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/xesugixazi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=about+net+examPDF 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_off0000b1d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1D9 10188 bytes
SHA-256: f8f5ce566275a20ff53f6b739cd440ede14d4a01aac0d0e5730790266fe7f129
font_01_sfnt_off0000c8bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e0cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0CF 16936 bytes
SHA-256: 47e9578a9681719949d72b03c06172d7206962f97371682780b757909ee241ff