Malicious PDF — malware analysis report

Static analysis result for SHA-256 2be6cc035e64bbcb…

MALICIOUS

PDF

88.6 KB Created: 2021-09-18 04:15:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e62063d7ba7b11b195eb51516406e95a SHA-1: 61675b9e69f5a463ee5eea9d72056cf4c518d770 SHA-256: 2be6cc035e64bbcb5c2a25941bef097fcbc12c209b69c381637d18a6313c2e8b
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with several heuristics indicating it functions as a link farm, potentially leading to phishing sites or malware downloads. The ClamAV detection and ML classifier strongly suggest malicious intent. The presence of compromised CMS upload links further supports the malicious nature of the hosted content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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 http://www.bash.cl/media/file/zoxutopuwedaga.pdf In PDF document text
    • https://ojazzdance.fr/userfiles/file/lijenibekarilox.pdfIn PDF document text
    • http://amicissiapiemonteisa.it/userfiles/files/52478636061.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613b06dc0f516---54165907728.pdfIn PDF document text
    • http://koutingchina.com/upload/files/91169674438.pdfIn PDF document text
    • https://esterkins.de/ckfinder/userfiles/files/1512769199.pdfIn PDF document text
    • https://matrixx.lu/images/70019921547.pdfIn PDF document text
    • http://www.udelimpa.es/ckfinder/userfiles/files/xelowamiwi.pdfIn PDF document text
    • http://leton.pl/userfiles/file/82959232698.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/figorivurupuxofufixaxo.pdfIn PDF document text
    • https://edinburghpools.com/contents/files/86587680195.pdfIn PDF document text
    • http://babijie.com/upload_fck/file/2021-9-18/20210918075849928486.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/m5rktvu1ktci5md0i4re9poo1i/gibaguzij.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/9c2efeccddf714e1b4821d2cd50aee2b/41846968752.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1613d87e2a9911---goxenuzobeja.pdfIn PDF document text
    • https://rajatotogroup4.com/contents/files/xadif.pdfIn PDF document text
    • https://27061010.com/uploads/files/202109172013359328.pdfIn PDF document text
    • http://chiangmai-esc.net/user_img/files/18876139472.pdfIn PDF document text
    • https://khabul.mn/mmpa/userfiles/files/30149799707.pdfIn PDF document text
    • http://fsgzb.com/upfolder/e/files/20210917211958.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=best+photo+editor+on+play+storePDF link annotation
    • 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_off0000f56d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF56D 18192 bytes
SHA-256: 10584a4df9d1b917fc8ee8c68062abf41e9d030c31ec8fdad61c343228cee1ed
font_01_sfnt_off00012443.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12443 10656 bytes
SHA-256: caacd28b635da4509dc1d6185ac4c4e21400cae790fc37be675cd350a2456473
font_02_sfnt_off00013cab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1