Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e18c095b2bd96f1…

MALICIOUS

PDF

71.5 KB Created: 2021-09-27 06:30:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0fbce9791a9eeffd50a9ae167c4af389 SHA-1: 49e30401f652c649fc784ad9ceefafec20487a09 SHA-256: 9e18c095b2bd96f19bbfe12ade0b35c162bc4660e3c2ff9a8d93c70e9b0db347
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external links, many hosted on compromised websites or disposable domains, indicative of a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution via these links. The document body is heavily obfuscated and appears to be generated content rather than user-readable text.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://philabc.ru/uplcv?utm_term=nds+emulator+apk+drastic
    • https://silky.ae/images/bulk_images/files/sasobilazameliteku.pdf
    • http://salonrowerowy.com/userfiles/file/33244718874.pdf
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/ba4ce4ad44d1ec88400046e6d6525a0e/71337833782.pdf
    • http://rockefellersgold.hu/editor_up/49843334884.pdf
    • https://arbormaster.us/uploads/files/besawafijiz.pdf
    • http://korea-seals.com/ckfinder/userfiles/files/biziponilalujemunixebun.pdf
    • https://ximangcampha.vn/upload/files/42179305799.pdf
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1614827bd60018---52769140905.pdf
    • http://campbellelectronics.com/uploads/76230095839.pdf
    • https://brianspradlin.com/userfiles/file/wagaka.pdf
    • http://domexpo.ru/up/file/gibuxunu.pdf
    • https://edusfera.pl/upload/file/wekok.pdf
    • https://salvatoredivilio.it/userfiles/file/40802624050.pdf
    • http://sunnyten.net/userData/board/file/mufixevokujodonomok.pdf
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/e96b00e8d7de6ed87c40905cc29d9f1e/wosudepeke.pdf
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/a44992a9355d4653fa89b3b84f745468/31237985858.pdf
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fdcb7ca001---danupujubutebexuluzomeb.pdf
    • http://weiken-rc.com/upload/files/gudofefazagosole.pdf
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614cc96e14a68---tiwikelubakibimulajar.pdf
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614d5ee4a89d0---tolawisobazelivezavasuge.pdf
    • http://studioferrato.it/userfiles/files/67985884660.pdf
    • http://greenhere.cn/upload/ckimg/files/202109030203338217.pdf
    • https://biomisszio.hu/tmp/20837853847.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/o4l9r4i4pjfank44bgsij5ptv1/19048000280.pdf
    • https://abicecream.ru/ckfinder/userfiles/files/fapijuwojizasixumewid.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b58e.bin
ece2335214b265cddee77f87a1955ec5b4cb5464f5583fbe1c60083808e285bc
pdf-font-stream PDF embedded font (sfnt) at offset 0xB58E 16464 bytes
font_01_sfnt_off0000df87.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF87 16792 bytes
font_02_sfnt_off0000f79e.bin
2c6bbfb6a549236a10228987fcf0a8951f07334534a74091729988e26628cd18
pdf-font-stream PDF embedded font (sfnt) at offset 0xF79E 10740 bytes