Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ed8eb81fed33909…

MALICIOUS

PDF

76.7 KB Created: 2021-07-20 11:41:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: c487f168d707d6381b40caf9ec12e045 SHA-1: 0d4a6e169e2e2cf7b14bb61e3bec3a5f8a4839c1 SHA-256: 9ed8eb81fed33909d5d4ef6eb904fc3700523c8ea36353e35ec176611d688180
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristic firings and numerous URLs are sufficient evidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee395eef5b---41776015936.pdf In PDF document text
    • https://getadoc.in/ckfinder/userfiles/files/83739392254.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a6faff7d848---61137843915.pdfIn PDF document text
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/72502468153.pdfIn PDF document text
    • http://komputerzagrosze.pl/userfiles/file/vibikolegon.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/f5hc7si461hpb5suurahkgmjdh/raguledivuz.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab4db71dbf7---jilawatexikokig.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160cbed24a3df3---regamerepujuv.pdfIn PDF document text
    • http://xz-brand.com/ckfinder/userfiles/files/bujowusezizozufoj.pdfIn PDF document text
    • http://olneyjune65.com/clients/d/dc/dcef5d22f85ec69f5810ba62c2e8cf46/File/28360935110.pdfIn PDF document text
    • http://grandinspirations.com/clients/75274/File/totawewenebi.pdfIn PDF document text
    • https://vestol.bg/files/file/sepinizovoborivopuluj.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c08f01b0946---53303523716.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/25354524555.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/fc72fdeea28dbc6a2755978fb7224958/33359419475.pdfIn PDF document text
    • http://seamacros.com/upload/file/panojaj.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/0dccfd92d70b439509ccff888dec6f60/5812014060.pdfIn PDF document text
    • http://topoint.cc/userfiles/fckFile/20210628122652.pdfIn PDF document text
    • http://khanaphatgroup.com/UserFiles/file/pisezekujunivumaxuzo.pdfIn PDF document text
    • https://aljazeerahpetroleum.ae/userfiles/files/peluxajoluderadubuzus.pdfIn PDF document text
    • http://iltorg.ru/upload/file/kumanubusolilukav.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/vp2q2r59eimnj4i7v8fufbf1sv/molidunana.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=chapter+2+quiz+2+geometry+answersPDF 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_off0000c58d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC58D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD9F 17364 bytes
SHA-256: 63304e27c7bbde30d445b940376ea1aca81a8d54729ec0c52b73f95a5b4929e5
font_02_sfnt_off00010b82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B82 11308 bytes
SHA-256: 33d13352684b3890ff5e2a23dc12db29fdf2ee30b426b292dd6f9bef92bed2e2

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