Malicious PDF — malware analysis report

Static analysis result for SHA-256 2586ba6ca66e747f…

MALICIOUS

PDF

101.2 KB Created: 2021-09-03 17:12:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: e4213ca115c5d41e4d3850900536ae7d SHA-1: 9e9ba0eed09925b47fcb6b64d6fe3e2be2d8c49d SHA-256: 2586ba6ca66e747f29a04aee6adc0812c0216a83dcbe386b588f80f794faf666
214 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical finding for linking to known malicious redirector infrastructure. The ML classifier also assigned a high probability of maliciousness. The document contains numerous embedded URLs pointing to potentially compromised websites, suggesting a phishing or malware distribution scheme. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://allytemp.ru/uplcv?utm_term=change+and+habit+arnold+toynbee+pdf In PDF document text
    • https://businessservicesuk.com/userfiles/file/37395160872.pdfIn PDF document text
    • http://rauvuonsach.com/images/uploads/files/vokolipudixevibadimik.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/revobefewunetodivagazet.pdfIn PDF document text
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/5aded68099a27177e0f42c1b0ea63936/38137921477.pdfIn PDF document text
    • https://flyags.com/editorResources/file///18756140725.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/a10459b39c14f1ecfaddd7788b009e86/14708682498.pdfIn PDF document text
    • http://newgatedesign.com/Images_upload/files/lekujelixuwaz.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c26e03209b---mujabiwuje.pdfIn PDF document text
    • http://mindatpeace.us/uploads/files/wusime.pdfIn PDF document text
    • http://alexhofford.com/temp/files/file/zojufo.pdfIn PDF document text
    • https://trotusgrup.ro/ckfinder/userfiles/files/xexufunap.pdfIn PDF document text
    • http://networkinglikepro.com/ckfinder/userfiles/files/dimepawoli.pdfIn PDF document text
    • http://okna-dvere-online.cz/media/upload/upload/file/koximunadivufolamal.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c443bde8b---90585957307.pdfIn PDF document text
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/40dc622b768f728dc25420646123fb37/77011775533.pdfIn PDF document text
    • http://kap-group.com/ckfinder/userfiles/files/zexolilotinobepukib.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/sijurita.pdfIn PDF document text
    • https://generalaudit.pl/eurostyl/photos/file/mepojikeked.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/dc4133b4e93a26fadba51fcaacead63d/282152407.pdfIn PDF document text
    • https://topupdana.com/contents//files/venutifidipuzabudepumok.pdfIn PDF document text
    • http://trendymamy.pl/userfiles/file/sudidogonedemanul.pdfIn PDF document text
    • http://ceramkgres.ru/userfiles/file/90320927105.pdfIn PDF document text
    • http://sbhs1967.com/clients/8/89/8985ce50e7417da620f75e2af787291b/File/45474635883.pdfIn PDF document text
    • http://badaranquehablar.com/userfiles/files/17528471280.pdfIn PDF document text
    • https://angelsforwarriors.org/userfiles/files/25029957217.pdfIn PDF document text
    • 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_off00012052.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12052 20540 bytes
SHA-256: 07ceb01a6d5a3bec44d15daaa3fd02b14f977c5fb8f8407b929f36775de68ddd
font_01_sfnt_off000155dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155DC 10896 bytes
SHA-256: aa60ab64eded936c0c90a36c3d292048b924dc3c1d0f73f72dddf92747ffd25d
font_02_sfnt_off00016e97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E97 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1