Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a5bb7acf3422ebe…

MALICIOUS

PDF

78.4 KB Created: 2021-09-06 12:50:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4abc7e3370dca8d312fc95e805456a5c SHA-1: 9c7e47ad8912ca3fc8903684f28894e49f90e5ae SHA-256: 7a5bb7acf3422ebe31c2b4ed63fb1ecb5240354d69b323f4ec4c321659b7f8e3
156 Risk Score

Malware Insights

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

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 embedded URLs pointing to compromised WordPress sites and disposable hosting. The document body is heavily obfuscated, preventing analysis of its specific content, but the overall structure and URL analysis suggest a phishing or SEO manipulation scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/debb4137dcfb7ffab25d60d8e0b29271/jabukagaseligomu.pdf In PDF document text
    • https://marblobathware.com/app/webroot/img/files/40001999264.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/pewapezimizajowivitewaju.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16102c7d114444---98728166658.pdfIn PDF document text
    • http://kxnjl.com/userfiles/files/madeta.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/edf5f9a6bea9a890c1913faf950f9c11/zomejapakulotedo.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/tjcp0cef9fdtsq03msf4tl0ih3/vepoz.pdfIn PDF document text
    • https://yuss.it/file/vojarako.pdfIn PDF document text
    • http://trevorhannant.com/jodepug.pdfIn PDF document text
    • https://www.mmgrowersg.com/ckfinder/userfiles/files/betupubidijul.pdfIn PDF document text
    • http://tizianaiberti.it/userfiles/files/47969034612.pdfIn PDF document text
    • https://aedwea.com/upload/foto/7718046151.pdfIn PDF document text
    • https://arnetbilgisayar.com/upload/ckfinder/files/35970498306.pdfIn PDF document text
    • http://nakajima-ya.com/upload/save_image/files/27554971895.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/42986520855.pdfIn PDF document text
    • https://evpersoneli.net/ev-personeli/file/tasiforaxofazafibuvewek.pdfIn PDF document text
    • https://rinducm1.com/contents//files/munovutorirezitubuwu.pdfIn PDF document text
    • https://kompaspt1.com/contents//files/99260782276.pdfIn PDF document text
    • http://wadirumshootingstars.com/userfiles/file///66326819779.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/669dadd4b59d9372acb4c48bfa16acf1/lafobosefavitewirubijem.pdfIn PDF document text
    • https://gomaihoa.net/upload/files/50226251709.pdfIn PDF document text
    • https://aokman-drive.com/d/files/gugovutam.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/guveno.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160738aee6005a---tikukod.pdfIn PDF document text
    • https://taksis.lv/taksis/userfiles/file/julikiduwezevuso.pdfIn PDF document text
    • https://gulfb2b.com/userfiles/file/38309590899.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=permanent+magnet+free+energy+generator+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_off0000cf6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF6C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e783.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE783 10648 bytes
SHA-256: d468e9a2e483c4ce6dde15b7860eecc764fd9c0b65d3e423b801cacba0c96f50
font_02_sfnt_off0000ffb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB2 16872 bytes
SHA-256: 5819b607d9821bed47377f0eb87e8a407fafe9809f95cc6aadd1f0fd32fea5e7

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