Malicious PDF — malware analysis report

Static analysis result for SHA-256 4431c3b2999ceb75…

MALICIOUS

PDF

81.2 KB Created: 2021-09-08 17:31:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 742df222e751397824a6d1220c645f94 SHA-1: ab397b24e769e5af0d44e3a73f5dc51611327cbf SHA-256: 4431c3b2999ceb75b91a0e4f5395a6ef91208d75d86c0593777ed31405c03868
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as a malicious PDF by ClamAV and an ML classifier. It contains numerous external links, many pointing to potentially compromised websites or disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and the overall structure indicate an attempt to lead users to malicious sites, likely for phishing or to download further malware, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://drafthe.ru/uplcv?utm_term=physics+general+science+pdf PDF link annotation
    • http://lynxitservices.com/ckfinder/userfiles/files/87287013384.pdfIn PDF document text
    • http://bookblog.kr/data/file/files/44354743325.pdfIn PDF document text
    • http://chronocertif.com/userfiles/file/fazibixomesumutarumekuto.pdfIn PDF document text
    • http://leylasuren.com/images/userfiles/imagefile/busosaxetesozoxavis.pdfIn PDF document text
    • http://thepnguyentran.com/media/ftp/file/vafazerebewejira.pdfIn PDF document text
    • http://oldmotorsclub.com/files/file/88354899815.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613182ee25084---kupulaxevopedutaniwesipe.pdfIn PDF document text
    • http://xn--22cjbbm2eyae3ehabdb4kqdtae3dxnnc1fhf.com/user_img/files/97467546759.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/af0e2ec823d7371da6beffb9959bf653/43341069755.pdfIn PDF document text
    • https://suprizpin.com/calisma2/files/uploads/85235825985.pdfIn PDF document text
    • http://carszana.com/image/upload/File/pelaposurunuvakuzozimomu.pdfIn PDF document text
    • http://originalbau.hu/imagesfiles/17469486531.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/ff12892a9d7f84f2ac0964ea7f64fcc3/tupijidixajupopar.pdfIn PDF document text
    • https://techlan.pl/files/file/kakigekufanodureselikono.pdfIn PDF document text
    • https://hasekei.jp/userfiles/file/30337140841.pdfIn PDF document text
    • http://www.asiacoservice.com/file/files/givotawijem.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.info/upload/files/wefifeninepadofidoruri.pdfIn PDF document text
    • https://pointvirgule.ca/upload/editor/file/revokifobemuve.pdfIn PDF document text
    • http://dieterheich.de/images/uploads/file/51354196170.pdfIn PDF document text
    • http://domingo.hu/ckfinder/userfiles/files/kukefanako.pdfIn PDF document text
    • https://adrfarysz.pl/userfiles/file/73597549021.pdfIn PDF document text
    • http://synfarm.com/upload/files/gewojiluzelepetumiwige.pdfIn PDF document text
    • http://portakalweb.net/home/portakal/public_html/ckfinder/userfiles/files/83291553127.pdfIn PDF document text
    • http://tareeapartment.com/user_img/files/xudozisututuvat.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/0ac35f0510f851942b2ff9cc1e79a2c9/55715524519.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_off0000d940.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD940 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f157.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF157 10796 bytes
SHA-256: 9d310ab5b94a4128c4282f0c6ab6e2544da12ee1084ddb24efee77f39a057c76
font_02_sfnt_off000109ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109EC 17516 bytes
SHA-256: 8f6cca2df25f8cd9fa4733b7879174b94b23124cf1c81d51541a9fb3a260027d

Open this report in the interactive analyzer, or submit your own file for analysis.