Malicious PDF — malware analysis report

Static analysis result for SHA-256 8901cd4732f5f0eb…

MALICIOUS

PDF

69.6 KB Created: 2021-09-25 04:00:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cfcb4c56733b278e1506fffe52d9b3ea SHA-1: da39a183ba366a750003978df4fb210c6c3c6d1e SHA-256: 8901cd4732f5f0eb8f6ccecfe244d48825a4a3495dea228f4977261102f437f4
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 compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of external URIs and link farms points towards an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://inwebjor.ru/uplcv?utm_term=geometry+dash+mod+apk+unlimited+everything+ios PDF link annotation
    • http://studiobardinisrl.com/userfiles/files/gosirotorodaxobukiz.pdfIn PDF document text
    • https://chandrakantmusicacademy.org/ckfinder/userfiles/files/jobula.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/79957828747.pdfIn PDF document text
    • http://stepasidemedical.ie/images/uploads/file/5030928519.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/0c898c8c608537943c80ae4ef4534e6a/77633797448.pdfIn PDF document text
    • http://ieeepes-thailand.org/app/webroot/files/files/bikodamanolodo.pdfIn PDF document text
    • http://sportgalaktik.sk/userfiles/file/76313488006.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///30059704366.pdfIn PDF document text
    • http://thaifilmind.com/UserFiles/file/vegedovu.pdfIn PDF document text
    • https://tonere.shop/app/webroot/files/userfiles/files/pivefenedoterodedonobipa.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16136d854a5911---nedevaritimife.pdfIn PDF document text
    • https://geloracinta.com/contents/files/raxiwesubajamepo.pdfIn PDF document text
    • http://unibeauty.com.br/ckfinder/userfiles/files/29379858331.pdfIn PDF document text
    • http://hairfibers24.com/upload/file/foranefipebowegu.pdfIn PDF document text
    • https://impactmediaresources.com/userfiles/file/67046297648.pdfIn PDF document text
    • https://www.prieur-equipement.com/ckfinder/userfiles/files/34447261767.pdfIn PDF document text
    • http://bindashnews.com/userfiles/file/45734078339.pdfIn PDF document text
    • http://seoaudytor.pl/userfiles/file/rakukap.pdfIn PDF document text
    • http://sahamit.net/userfiles/file/47938246816.pdfIn PDF document text
    • https://impulsa.mantareys.net/uploads/plantillas/files/lenuwegele.pdfIn PDF document text
    • https://consultemergingmarkets.cubsindia.com/files/88566416557.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/aa86bcf4ab5eee91a1325b8ca9e75ce2/68043196760.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_off0000ac5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC5F 11248 bytes
SHA-256: 48b4b867105f3ad97c5cae36e870c5843972c3f4434fe25bf5a68bb8e5165c76
font_01_sfnt_off0000c666.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC666 16080 bytes
SHA-256: 3c4da8b403a10c54dcdc7c477be3293fc901a371bf60308cb18323f88cdc65a4
font_02_sfnt_off0000ef3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1