Malicious PDF — malware analysis report

Static analysis result for SHA-256 90dfe6bb5c8ece60…

MALICIOUS

PDF

91.3 KB Created: 2021-09-06 09:01:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5fed04f56d828999eee91093a03c4f5e SHA-1: 536416897507fdb3e060982d2bb36feac5f7d970 SHA-256: 90dfe6bb5c8ece60440c85a6eabcbd2d52d973b14cd917211f0de91efa9785c0
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The embedded URLs and the nature of the heuristics strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/160718fc522316---womufolofigab.pdf In PDF document text
    • http://suamayin.biz/userfiles/file/69431029702.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/jqlq4vts30e4gc3o04csldrkhc/kejukegetirekewab.pdfIn PDF document text
    • http://swaving-stalinrichting.nl/ckfinder/userfiles/files/nefovaxekigoxeziraxemado.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/dawepazexebosawasijevupaf.pdfIn PDF document text
    • http://zatoodesign.com/userfiles/files/tumajatuzevo.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c18cc529266---lumefufiw.pdfIn PDF document text
    • http://capital96.com/userfiles/file/48242565152.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/87193845238.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160fbb9ff1a89e---27731208936.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/3eb7b8dd61eef53ff9df9cbe9e2197f7/vegenipu.pdfIn PDF document text
    • https://info-jimukyoku.jp/lot/upload/files/kejowef.pdfIn PDF document text
    • http://ipmarketing.net/userfiles/file/45766956407.pdfIn PDF document text
    • https://kga-am-adlergestell-ev.de/kga/ckfinder/userfiles/files/vepej.pdfIn PDF document text
    • http://cuatudongnhatrang.com/uploads/files/51547878400.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a36389b6b60---vekawedizomofukovezutesi.pdfIn PDF document text
    • https://www.medicalbi.com/ckfinder/userfiles/files/seditarududuxizasezivudur.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160724a4088222---lidoli.pdfIn PDF document text
    • http://drivingschool-brno.eu/files/71165189096.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edf9b29aa1a---6851113753.pdfIn PDF document text
    • http://www.bash.cl/media/file/rarap.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076eb8a00113---zowojoje.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/wufaxinufulubuvore.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=best+novels+of+all+time+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_off0000ff75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001178c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1178C 10680 bytes
SHA-256: b1d93302a96e7c8e468b3a4d5f1f9214519e692cffaf5d6370605db0c263d0bc
font_02_sfnt_off00013014.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13014 18444 bytes
SHA-256: 7d29fd3ab43f4089922e13c5f92031474918087c7cd0bdbd25f003fb7b92be52

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