Malicious PDF — malware analysis report

Static analysis result for SHA-256 e23bae748e42c64a…

MALICIOUS

PDF

95.8 KB Created: 2021-09-13 02:08:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b00abac26fd2a0b98de5114a353e9ff0 SHA-1: 29d379f93c8800dc7f21852bf79f57be77539c71 SHA-256: e23bae748e42c64a16ead0b56ea251491fd88902b53a3300bb6c295c2d801bc7
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple domains, some of which are hosted on compromised CMS platforms or appear to be disposable. The embedded URLs suggest a lure for users seeking a 'cwm recovery tool download', indicating a phishing or scam attempt. No scripts were extracted, but the PDF structure and URL distribution are indicative of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://veterina-naslunci.cz/userfiles/file/87395135626.pdf In PDF document text
    • https://economiadecomunion.net/ckfinder/userfiles/files/woroponofanajezejezi.pdfIn PDF document text
    • http://avandcie-automation.com/ckfinder/userfiles/files/91414603404.pdfIn PDF document text
    • https://samajsutra.com/userfiles/files/jetuxepovejo.pdfIn PDF document text
    • http://qdsenfeng.com/data/files/bawuxemetixine.pdfIn PDF document text
    • http://finadev-groupe.com/userfiles/file/19758283773.pdfIn PDF document text
    • http://losmarinoslanzarote.com/marinarubicon/admin/file/56271313630.pdfIn PDF document text
    • http://wasserburg.pl/userfiles/file/gidimiwegemipinogotubaj.pdfIn PDF document text
    • https://csn-alliance.com/data/files/laxilekakix.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138105072b91---56986011975.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131d0ad7257c---fevovivazemedusidi.pdfIn PDF document text
    • http://vlajamo.cz/images/file/26952091742.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aac38231e1---gibimifovuz.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///xozix.pdfIn PDF document text
    • https://jmcoverseaspvtltd.com/uploads/files/pagopavopojavapiga.pdfIn PDF document text
    • http://clearspace-design.com/CKEdit/upload/files/bulikiremifemudinoxifo.pdfIn PDF document text
    • https://nitm.ac.in/nitmeghalaya/ckfinder/userfiles/files/durunafi.pdfIn PDF document text
    • http://madonnina.info/userfiles/files/devoligabopav.pdfIn PDF document text
    • http://cuuhoatudong.com/upload/files/pulewekekumakav.pdfIn PDF document text
    • http://homeopathyhongkong.cn/files/doxesurupiridisejofumex.pdfIn PDF document text
    • https://xanbiente.de/userfiles/file/46870524608.pdfIn PDF document text
    • https://ctcitsupport.com/media/files/65865455969.pdfIn PDF document text
    • http://status-go.net/gfx/userfiles/files/rapef.pdfIn PDF document text
    • http://sparan-art.ru/ckfinder/userfiles/files/jegopudezejid.pdfIn PDF document text
    • http://machinesupplier.cn/data/product/file/202196_123935_646.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=cwm+recovery+tool+downloadPDF 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_off00010ebd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EBD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000126cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126CF 19024 bytes
SHA-256: c934eae4da32a515095f09682451b1b2f5ac420f7cf0b9025392d1cde5698372
font_02_sfnt_off000157c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157C8 10568 bytes
SHA-256: d2f66ef4de8a03d23ae2a9bfa164f1aa50a0b4381013ab444448719abf937946

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