Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0b8a8c9fd5f1f08…

MALICIOUS

PDF

82.6 KB Created: 2021-09-21 08:45:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cc736e634539937b941347e7a31b957d SHA-1: 2386814a619559dbd187dbc8b741d8af50c2a0d3 SHA-256: a0b8a8c9fd5f1f0833743f5a47fde87bf776678515d5d18084375363969f83d3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The presence of 'utm_term' parameters in some URLs further indicates a tracking or redirection mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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=change+font+android+phone
    • http://appextskihjthj.handysociality.com/upload/files/nejikagegudowudomamu.pdf
    • https://podiummagazinenews.com/ckfinder/userfiles/files/13077122206.pdf
    • http://tuecpa.com/file_media/file_image/file/43974841622.pdf
    • https://illinoisfiscalpolicycouncil.org/app/webroot/userfiles/file/87830134727.pdf
    • http://vagtteam.dk/userfiles/Files/62797021088.pdf
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140a5383e2d2---nalusiwekexiwevoso.pdf
    • https://hoangvan.vn/wp-content/uploads/files/93823987917.pdf
    • http://leaders-adv.net/userfiles/file/mimosalobinomasoguji.pdf
    • http://3qlohas.com/CKEdit/upload/files/33374729250.pdf
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614138c7bf3fe---46817316088.pdf
    • https://alexspa.pl/userfiles/file/19825465058.pdf
    • https://xnkvinatimex.com/uploads/files/tafilemefisodutagozevewuw.pdf
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/335fd131db82857fa202d31a16d1e8c4/fomijukokevajawajevorovij.pdf
    • http://kingkady.com/uploadfile/files/vexafosele.pdf
    • http://winkeleninzundert.nl/uploadimages/files/nozebog.pdf
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/beb2c9b490230094d3ed6c46c56cba08/zititebawobames.pdf
    • http://ranahytta.com/ckfinder/userfiles/files/60525644135.pdf
    • http://poaglasses.com/uploads/files/202109171522148143.pdf
    • http://soeurs-scjboran.fr/soeurs/upload/files/17120590132.pdf
    • https://patidarpalanpur.com/web/k/main_admin/ckfinder/userfiles/files/68786982967.pdf
    • http://mhinflatable.com/upload/file/16715500149.pdf
    • http://eichler-kammerer.de/nazarimenidojunaka.pdf
    • http://attep.com/home/sandbox/domains/heekee.com.hk/public_html/ckfinder/userfiles/files/26545650961.pdf
    • https://www.mds-horizons.com/upload/files/33298061866.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_off0000de11.bin
4807d5e1410fd70b3270856930f4055bce0dbc3e253a1eba752e275b05dbbdbd
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE11 10592 bytes
font_01_sfnt_off0000f5fc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF5FC 16792 bytes
font_02_sfnt_off00010e0e.bin
767f280ea51630f4e9ad21aa5c76a2c53a6f91ce7cfead8c0857ebc38a379620
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E0E 18180 bytes