Malicious PDF — malware analysis report

Static analysis result for SHA-256 eaa782b07bf73d67…

MALICIOUS

PDF

81.2 KB Created: 2021-09-03 17:50:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5f2bf2c356ce840c981f3802f6e3a5a0 SHA-1: 2a8645ab64430fd23bd28b1831e3b28ca2134d48 SHA-256: eaa782b07bf73d67e1393cda27930bea693a6799cd3f6563299497d60924ba5d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised or disposable domains, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://chcial.ru/uplcv?utm_term=networking+mcq+questions+with+answers+pdf PDF link annotation
    • http://baigeleather.com/userfiles/file/zopumerosezuxixuxabomaj.pdfIn PDF document text
    • http://eviljoy.com/UserFiles/File/52866399551.pdfIn PDF document text
    • https://profix.fr/ckfinder/userfiles/files/moferidazatonagitekexu.pdfIn PDF document text
    • https://ryokanclub.com/FileData/ckfinder/files/20210701_0F0C29484C438C72.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160e952216465f---17183648423.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/files/jupavibi.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d923a34b466---27239726501.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/lp4bujf6n3429pa9q55p1enmi6/57493746003.pdfIn PDF document text
    • http://bualuang101.com/backoffice/upload/files/69288121782.pdfIn PDF document text
    • https://irepairplus.nl/app/webroot/files/userfiles/files/xizetubalotorisidabi.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb989e6703c---17749566565.pdfIn PDF document text
    • http://stamforgtechnologies.com/uploads/zomalupobib.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/929e0181bde04a3003c542b60fc75e2b/23148275990.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/3e3a6c511ad55a67237b29e403210560/vasuzef.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/b77ehrg7vnt652m8kpplmhnmr6/37127502619.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/15e13002c86fbb50f35a826aecd2f41a/todelusejanam.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1c322709c---18368261930.pdfIn PDF document text
    • http://vinacafe-dalat.com/Images_upload/files/dasubopoduzuda.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bd7f453e7c9---niditixijugomebodapam.pdfIn PDF document text
    • http://emirates-offshore.com/uploads/image/file/77570373638.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/tubpmuo2u7ni7edivgmj1i2ro6/jiwafoxud.pdfIn PDF document text
    • https://iveducentar.com/uploads/assets/file/texumekagip.pdfIn PDF document text
    • http://www.mustwalge.ee/data/content/files/nunadubifif.pdfIn PDF document text
    • https://aedwea.com/upload/foto/59157517833.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_off0000d2eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2EB 11424 bytes
SHA-256: daa3ed260132c2b53eeca9d5971f6c345fc1861677dee7d1816023c28dc81b8d
font_01_sfnt_off0000ed3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED3D 19424 bytes
SHA-256: f102b17f5fe2ac30401f4c29434f19c28527005043b6acdbf813eecc36755ae3
font_02_sfnt_off00011ec0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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