Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7fcfa11fcbf3e2c…

MALICIOUS

PDF

83.8 KB Created: 2021-09-13 03:14:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c793242774721a09545014c05b94fbd8 SHA-1: 026f8efca63133a19e20e95e412e9149b22631a1 SHA-256: f7fcfa11fcbf3e2cbc4b44eee923a393d018b3ed68e12888c5a4e93b9cf63201
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many of which point to disposable hosting or compromised CMS upload directories. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript, though not fully analyzed, is a common vector for exploiting PDF vulnerabilities or redirecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://xn--h1aaebajlcgx.xn--p1ai/sadm_files/rexofonoberelos.pdf In PDF document text
    • http://beautifulmoda.com/userfiles/files/bidufavuliwigireberi.pdfIn PDF document text
    • http://yangs-ns.com/ckfinder/userfiles/files/20210911163540.pdfIn PDF document text
    • https://quangtriasianwindow.com/uploads/image/files/8931071722.pdfIn PDF document text
    • http://gok-maciejowice.pl/js/ckfinder/userfiles/files/kelifaxirimusavat.pdfIn PDF document text
    • http://besteva.com/upload/files/58902876208.pdfIn PDF document text
    • http://synthecinter.com/userfiles/files/96541616656.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e331b9bc31---xixowevo.pdfIn PDF document text
    • http://dogoxuavanay.vn/uploads/files/difunisuzoba.pdfIn PDF document text
    • https://kop-trans.pl/uploads/userfiles/files/bevasigaxo.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/dn11af9rknd8n1ktgirhffldaj/52963456491.pdfIn PDF document text
    • https://huanghecables.com/d/files/takubanezuju.pdfIn PDF document text
    • http://abwhopewell.com/uploads/files/koxip.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/65520499679.pdfIn PDF document text
    • http://cementfeet.com/userfiles/file/dovoguxeduvefozawaletites.pdfIn PDF document text
    • http://red-persimmons.com/upfiles/editor/files/46805723491.pdfIn PDF document text
    • http://www.puhito.hu/uploads/zideta.pdfIn PDF document text
    • https://webvitamin.vn/app/webroot/uploads/files/luzazuzepodekituxe.pdfIn PDF document text
    • http://productinfo.in/konadnew/userfiles/file/93869590497.pdfIn PDF document text
    • http://noahmission.org/dataroom/file/31912974918.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130d74a6580c---50693208400.pdfIn PDF document text
    • https://matfplayer.com/calisma2/files/uploads/mawatinaporexi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=beautiful+camera+download+apkPDF 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_off0000dce5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE5 19696 bytes
SHA-256: 9fd5b574135c170b8223623129da5e3c8b23012d713b102042df57755defe279
font_01_sfnt_off00011091.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11091 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000128a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128A8 10944 bytes
SHA-256: 03fd22ca76bce2d06791592e3033a90270348379c19ea001a94e165bdd10689c