Malicious PDF — malware analysis report

Static analysis result for SHA-256 338f3a2f8471e875…

MALICIOUS

PDF

81.8 KB Created: 2021-07-08 10:47:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 1af1806b0a99d5c4a7e421cb6ca26c14 SHA-1: 1faf44c25614c98a476fd2a4d24af8a93fe2f39b SHA-256: 338f3a2f8471e8755a7781717ad480147c1f5718a85ed8bab8fe7740bb537c12
164 Risk Score

Malware Insights

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

The PDF file contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress sites acting as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded JavaScript is a common technique for executing malicious code or redirecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/ee4a595686bfc308c7332c6c86dc234f/pugagilezorabupatopa.pdf In PDF document text
    • http://kapli74.ru/upload_picture/tinixalezamufafedenovinu.pdfIn PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/11397101127.pdfIn PDF document text
    • https://electrabicycles.pl/app/webroot/uploads/file/16210836208281.pdfIn PDF document text
    • http://yejida.com/userfiles/file/vibujurilanani.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/ba718a1ef09515e14f21e183a38ebd4b/39377729977.pdfIn PDF document text
    • http://winfielddeli.com/ckfinder/userfiles/files/zusavufibogexasiwojedeme.pdfIn PDF document text
    • https://signika.pl/Upload/file/zufemimimubit.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/13e03c69caf67b35fdf96ecd7d89b0f7/pafulevazasene.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/8tsps4fvkcohjvmp503hth9cl4/99843110462.pdfIn PDF document text
    • https://viticoltura-enologia.com/file/28555828036.pdfIn PDF document text
    • https://burgas-remonti.com/userfiles/file/niwalu.pdfIn PDF document text
    • http://kamennykoberec.eu/editor_uploads/system/files/kofelozafelimenekira.pdfIn PDF document text
    • http://gpmpoolandspa.com/ckfinder/userfiles/files/68380815154.pdfIn PDF document text
    • https://gazelletr.com/userfiles/files/51653115468.pdfIn PDF document text
    • https://prastosten.se/anvandarbilder/95/files/40660667177.pdfIn PDF document text
    • https://asiajitu.com/contents//files/timelizadofiv.pdfIn PDF document text
    • https://www.tunnel.de/files/uploaded/file/81262135069.pdfIn PDF document text
    • http://bvsaigonbinhduong.vn/uploads/files/32586374631.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/7a70cco3e3nau9b9u34brj8753/gukesiraxopepo.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/pojikexugeviji.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/fogenibuxagonel.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/38711622506.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/a892cf2060037e7e5407b4c5a580a2fa/91661067526.pdfIn PDF document text
    • http://skyrunarser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210605203442400502jt16bl.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=form+2+revised+nomination+and+declaration+formPDF 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_off0000daeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2FD 16768 bytes
SHA-256: 50fa832bfc9bab4c7fad7d807725ab3557f71197012c127672a89b856423036d
font_02_sfnt_off00011ec8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EC8 10800 bytes
SHA-256: c513143184ad5ae81886dfdfdb1d85d85692f6836ccd9ef4e460ea12ee53bddd