Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9892bfa1efa9fcf…

MALICIOUS

PDF

77.8 KB Created: 2021-09-09 20:14:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 41593eb7a91933d5127888fd34eb112a SHA-1: 94f64c3e4767938bc5a909a177cf3fe3e905503a SHA-256: c9892bfa1efa9fcfc42d2b8776c930faae00d7af27ea17e6dc8a738be4f80525
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 uploads. The primary purpose appears to be directing users to potentially malicious content or further stages of infection through these numerous URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 https://profesa.net/userFilesfile/xiviniwomomubovewas.pdf In PDF document text
    • http://montpellier-business-plan.fr/mbp/upload/images/images/upload/ckfinder/puwegafepevazogomuvijogu.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/tagogofugugasewopinexo.pdfIn PDF document text
    • https://rais.bg/uploads/file/jemefopipunibije.pdfIn PDF document text
    • http://teenmag.cz/userfiles/file/fowoki.pdfIn PDF document text
    • https://anyimaker.com/upload/users/files/64161284922.pdfIn PDF document text
    • http://zjqzzx.com/uploadfile/file/2021090221102273499.pdfIn PDF document text
    • https://aicpwdosaeast.com/ckfinder/userfiles/files/20757969463.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/161363f36ef4a7---68518280599.pdfIn PDF document text
    • http://twilaw.com/files/files/88250650803.pdfIn PDF document text
    • http://jump360.co/upload/files/20210905152135.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe9c0610c5---6400517450.pdfIn PDF document text
    • http://naturallabs.fr/userfiles/file/zosuma.pdfIn PDF document text
    • http://www.ruben.pl/ckfinder/userfiles/files/64243938527.pdfIn PDF document text
    • https://hoakhanh.vn/uploads/image/files/78084217669.pdfIn PDF document text
    • http://fruitvita.com/files/files/judizafironawod.pdfIn PDF document text
    • http://haciogullari.com/depo/sayfaresim/file/66752419846.pdfIn PDF document text
    • https://812423.qqtogeljackpot2.com/contents/files/jupubovakagi.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/69955040522.pdfIn PDF document text
    • https://totalsewa.com/userfiles/file/75732133653.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16131c7284e2e0---75995198460.pdfIn PDF document text
    • http://bcslaw.hu/admin/fck_upload/file/botakiforagebipi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=the+gaming+project+play+storePDF 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_off0000ca18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e22a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE22A 17848 bytes
SHA-256: 056e74248a16110ee5abfef596bbb8a2d34afaf2341090d366dceed6e5d76126
font_02_sfnt_off00011095.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11095 11028 bytes
SHA-256: d3f7208ff48f96fd70d1c1f239ad65b9c8e9ce48c08b25fedc8175a0961c20d6