Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ae2dc3a383a93f8…

MALICIOUS

PDF

92.7 KB Created: 2021-07-28 02:34:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f6673e8bb420514de56fbe5e9200b0ca SHA-1: 69c3b634f46058a2126f009372a66685c20c7969 SHA-256: 3ae2dc3a383a93f80f7dfb4afecb5c95abd06f784b9428b8c3084ef0db8c176d
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely involving exploitation of PDF vulnerabilities to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://smobiil.eu/userfiles/files/jewigisolu.pdf In PDF document text
    • http://yer-krasnodar.ru/ckfinder/userfiles/files/minafo.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/0572862e8a0f74a920fd2e4fa5c4c78b/kejowazugogijozi.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b3e8ebf529---rinozuxagupitemenarajo.pdfIn PDF document text
    • http://1hozain.ru/files/userfiles/files/sazajusezusatixuvof.pdfIn PDF document text
    • https://florerialafloresta.com/ckfinder/userfiles/files/19147360458.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fb1d626f3463260c3b41330358e17e81/votonupukubilikoxanuzit.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/govugufunirapejozozatofep.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b41e685e17c---fefixaxenawopanepilifilov.pdfIn PDF document text
    • http://abwpetersburg.com/uploads/files/famopegomutakutesegax.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160fcc482a388d---30754450549.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076c51f7225a---janupiruni.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/9ko2915ir2gh081dg52dtj2mu4/81756511385.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16096a9a2c6458---16644406863.pdfIn PDF document text
    • http://feuerwehr-mittenwalde.de/mediathek/files/wevememerexir.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/dumijotutuxutugoxozumuwuz.pdfIn PDF document text
    • http://bruningfoundation.com/clients/9/99/99acc79c432c4c389b364f5b25189af3/File/66678441297.pdfIn PDF document text
    • http://candemdientu.com/Images_upload/files/lomezovupal.pdfIn PDF document text
    • https://gotamsui.com/ck_imgs/files/jegekotigegimave.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160dbdc3425c8d---zanavojatoluzezazetedasu.pdfIn PDF document text
    • http://inncredel.com/uploads/vekedagudetibotor.pdfIn PDF document text
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/riboz.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/f1e1cbf616c4fa3679dc446966f89a89/55789521455.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=foxwoods+restaurants+openPDF link annotation
    • https://mediaget.com/userfiles/files/15790331368.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_off000104ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011ce1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE1 10512 bytes
SHA-256: 582634a465aa4d6ac726c6ec05a115af730ce433276e9c037aee46d86ecda811
font_02_sfnt_off000134fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134FE 17708 bytes
SHA-256: f112fad30f1170d6f297f8d15e5736f82bb9310e96a968189ab94a75375a1b42