Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae0e5a27559f26ba…

MALICIOUS

PDF

81.8 KB Created: 2021-09-13 19:34:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c48e9c755c4c67ac338dcca6319c1ade SHA-1: 8eef48cc28d2572a28896469e9c2900a22b16d8f SHA-256: ae0e5a27559f26ba2d6d330196aed1389259028d5cbf86bbfb0bbdf00ee2efd0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://accesoriosalmayor.com/images/userfiles/file/rajasutizeranafaguvoj.pdf
    • http://jingkangchem.com/upload/files/satarivovabux.pdf
    • http://hotdeals24x7.com/ci/userfiles/files/moxovijux.pdf
    • https://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/24106238133.pdf
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134b75212f7c---94905468859.pdf
    • http://mpu-beratung-brendle.de/userfiles/file/fipugofokifizilotazar.pdf
    • http://etkindenetim.com/resimler/files/dasibi.pdf
    • http://appinaris.net/ckfinder/userfiles/publics/files/lunujekukujemafosumobik.pdf
    • https://manorhair.com/uploads/files/202109101453059589.pdf
    • http://smartpaintingplus.com/userfiles/files/ziwak.pdf
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c1f608076c---89415135050.pdf
    • http://theeultimatenetworker.com/ckfinder/userfiles/files/70857743748.pdf
    • https://brihat-group.com/assets/userfiles/files/70589059809.pdf
    • http://cancunday.com/travela/img/files/sasabibadixebasa.pdf
    • http://prime42.ru/userfiles/files/vijefuwijujukaxinijin.pdf
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/16139f99a82dc8---87474105446.pdf
    • http://akiyastyle.com/app/webroot/js/ckfinder/userfiles/files/monipofufotu.pdf
    • http://makesomenoise.hu/upload/file/livexidonimujugoxalexu.pdf
    • http://mrpokedb.com/uploads/files/3682241748.pdf
    • http://originalavto.ru/userfiles/file/58774003187.pdf
    • http://nofatrans-int.com/userfiles/file/wutilovexib.pdf
    • https://ww150006.linebot.net/upfile/files/20210903213350.pdf
    • https://cape-electronics.com/media/file/lupagoperupajeme.pdf
    • http://www.armstrongre.com/files/files/zetawu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=desktop+applications+examples
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd6f.bin
a8906fe2c7a45ab3ee8bed4e07f324eb85a604b54a78f2438305e5d70f68a7b9
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD6F 10632 bytes
font_01_sfnt_off0000f5d4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D4 16792 bytes
font_02_sfnt_off00010de6.bin
5299d06c3d84c1cda56fdbcd756c4044344e0c8acf253961c7865ade68a2cebb
pdf-font-stream PDF embedded font (sfnt) at offset 0x10DE6 16856 bytes