Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff0505a1340e5e4d…

MALICIOUS

PDF

85.8 KB Created: 2021-09-16 14:06:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5723d230e4686fb93226cc370296220f SHA-1: 3c295657747cbc70fb82a222cc86e9083f5e4222 SHA-256: ff0505a1340e5e4d5225f08b11737b6d7cf8f64c222395034846faa1c5f0851b
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of external URI heuristics and link farm indicators supports the conclusion that this document is a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://oniceh.ru/uplcv?utm_term=mortal+kombat+for+android+phone PDF link annotation
    • http://alfavs.eu/userfiles/file/8801346415.pdfIn PDF document text
    • http://baove24h.org/upload/files/luzasolubo.pdfIn PDF document text
    • http://skkl.cn/filespath/files/20210914055403.pdfIn PDF document text
    • http://wamaeassociates.com/images/uploads/originals/file/22805459361.pdfIn PDF document text
    • http://aimic.com/userfiles/file/95364087869.pdfIn PDF document text
    • http://sporteambiente.it/ckfinder/userfiles/files/58006140481.pdfIn PDF document text
    • http://jcnjl.com/userfiles/files/vifufunokebuxe.pdfIn PDF document text
    • http://scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/36778237245.pdfIn PDF document text
    • https://srmhomes.com/images/bulk_images/files/49087198249.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/4844038632.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613acec02ca29---velasopajebalexiwozukeri.pdfIn PDF document text
    • http://dermalab.pl/userfiles/file/fovopozobonumelobo.pdfIn PDF document text
    • https://infotechloyalty.com/bot/ckfinder/uf/files/defitek.pdfIn PDF document text
    • http://24horasnoar.com.br/ckfinder/userfiles/files/nifetufogogogimujorubizo.pdfIn PDF document text
    • https://healthlantern.com/ckeditor/ckfinder/userfiles/files/kilasuluvon.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16142cb95efc62---kejokurijikuranigesewavid.pdfIn PDF document text
    • https://nhaccugiare24h.com/uploads/userfiles/file/11493495509.pdfIn PDF document text
    • http://www.adarshvidhyasankul.org/userfilesfile/77655370217.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/dabimu.pdfIn PDF document text
    • http://daiquangsico.com/img_duhoc/files/bomebodupasebojigevidi.pdfIn PDF document text
    • https://bodymart.in/ckfinder/userfiles/files/gizesifemuzewagoposovige.pdfIn PDF document text
    • http://sunmoon-glory.com/web/upload/files/kunumivakojudisejox.pdfIn PDF document text
    • http://uforoi.com/app/webroot/uploads/files/siwonepazowobomuvop.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/b597e1e6b58191035c864bec56d784f3/loguruxegibido.pdfIn PDF document text
    • http://veiligheidssloten.nl/ckfinder/userfiles/files/54224414522.pdfIn PDF document text
    • http://dblbtech.com/userfiles/file/puxuzidaxutu.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_off0000eac5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC5 17620 bytes
SHA-256: 7af1a63eda4f74d605d02d18b0b39404c6be534addb47bbb3e9e6cea07911332
font_01_sfnt_off000118e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118E3 10820 bytes
SHA-256: d8b7f3a4d1974acc50e057b151c0aa740f420abbd84fca73c52c67b1613517da
font_02_sfnt_off00013163.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13163 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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