Malicious PDF — malware analysis report

Static analysis result for SHA-256 a78c5487146db782…

MALICIOUS

PDF

77.7 KB Created: 2021-09-13 07:25:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5aebd9b006e6886b8019b62b2f539021 SHA-1: f39d4bf9df7f40056778590f39e8c13ca9c1e315 SHA-256: a78c5487146db782b69de8c7245c8789fd2b10932878e0357b8d0b1466dafc72
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by ClamAV as a phishing trojan. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The ML classifier also strongly indicated maliciousness. The embedded JavaScript likely facilitates the redirection or further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://smidgel.ru/uplcv?utm_term=taxi+driver+simulator+mod+apk PDF link annotation
    • https://wojczak.pl/userfiles/file/bigezopawaxumunuriw.pdfIn PDF document text
    • https://hanakspotrebice.cz/eshop/ckfinder/userfiles/files/bomoxumujabojopil.pdfIn PDF document text
    • http://ntouioc.ntou.edu.tw/ckfinder/userfiles/files/41714105965.pdfIn PDF document text
    • http://qualityfirstservices.pro/testingsites/advantage_aviation/assets/media/file/27659586089.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/memajog.pdfIn PDF document text
    • https://xn--nmqu14inmf.com/upload/files/48897536787.pdfIn PDF document text
    • https://farmaciasacoor.com/site/upload/file/nijajijemelesul.pdfIn PDF document text
    • https://thuaphatlaihoanghuy.com/uploads/files/61807093114.pdfIn PDF document text
    • http://csptech.net/admin/userfiles/file/43942553075.pdfIn PDF document text
    • http://becskeicsodajo.hu/admin/fck_upload/file/bagetasav.pdfIn PDF document text
    • http://podushka.by/files/files/12298068495.pdfIn PDF document text
    • http://sushibelovo.ru/files/wixaxoteripuwubunoz.pdfIn PDF document text
    • http://kaizousha.com/js/upload/files/26354656162.pdfIn PDF document text
    • http://atek-ent.com/upload/file/getutoxezadovomijixikipiv.pdfIn PDF document text
    • http://alconsprom.ru/ckfinder/userfiles/files/11611204640.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/37970d3d20d6dc72fc7d4234a569061c/suwigozabulujixunis.pdfIn PDF document text
    • http://sky1981.com/asset/uploads/files/74737714665.pdfIn PDF document text
    • https://leganordavigliana.com/uploads/file/zunixewijof.pdfIn PDF document text
    • http://xn--80aadcnaeutgftohcogh8i8dsc.xn--p1ai/pict/file/90279345022.pdfIn PDF document text
    • http://hzeiger.com/userfiles/file/fexebunogagabavile.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/70339879852.pdfIn PDF document text
    • https://gulfb2b.com/userfiles/file/55724340075.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16133ddc131d14---japadakibususatiwidut.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613a1b20da2e5---95252198942.pdfIn PDF document text
    • 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_off0000c5cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dde6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE6 10772 bytes
SHA-256: e37ac86e6778757145dc5a606d13057675dad016083d0ca2c12902d0c06acb6a
font_02_sfnt_off0000f6c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C3 19080 bytes
SHA-256: 7588161c9df24cdfcae07b660c47e3817997239c5eb90ef719e6f2a2aba72c7f

Open this report in the interactive analyzer, or submit your own file for analysis.