Malicious PDF — malware analysis report

Static analysis result for SHA-256 786ba5ad7b045c28…

MALICIOUS

PDF

87.0 KB Created: 2021-09-12 15:31:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 191b8996932e7185505818352bea75dc SHA-1: fb4127b3810375aca3a50e2ce4c2beb87ca73750 SHA-256: 786ba5ad7b045c28ff1614b84fe46d4b27368ea4e4b4138feb2054d4ec051fed
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the rationale is based on the PDF structure and embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/713129ed53d9abfd662f83ec08908d6f/37964108772.pdf In PDF document text
    • http://osteriadelcampanile.com/userfiles/files/xusofodiwexe.pdfIn PDF document text
    • http://videocycling.info/files/file/fekiwajabosowusize.pdfIn PDF document text
    • https://learningsolution.ca/userfiles/files/89179640923.pdfIn PDF document text
    • https://kaskad-74.ru/images/uploads/25300267217.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/20407347921.pdfIn PDF document text
    • http://christopherdallo.com/file/pimunad.pdfIn PDF document text
    • http://diakmelo.hu/ckfinder/userfiles/files/64342481475.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/deropalikikogo.pdfIn PDF document text
    • https://hbfilm.ca/resimler/files/bosizugepuma.pdfIn PDF document text
    • https://dawnraytech.985.tw/data/file/userfiles/files/96955659307.pdfIn PDF document text
    • https://proektasis.gr/admin/spaw2/uploads/files/83688015768.pdfIn PDF document text
    • http://moriefrusca.com/userfiles/files/97862408359.pdfIn PDF document text
    • https://epponline.com/mentorfinancial/page_images/file/92064981148.pdfIn PDF document text
    • https://jairdefreitas.com/ckfinder/userfiles/files/vumorawaxasonabigebuti.pdfIn PDF document text
    • http://gesundezellen.com/neu/userfiles/file/18024410016.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134ede9e06ac---20812650644.pdfIn PDF document text
    • http://mosme.org/uploadfile/files/nomigomuwugupekojivut.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/vhr7jkvd3sngi8ujjqgj242va5/2599559197.pdfIn PDF document text
    • http://www.yemany.com/yemfiles/files/87519955194.pdfIn PDF document text
    • http://nurugelexport.com/ckfinder/userfiles/files/83050745057.pdfIn PDF document text
    • http://gamjagolla.com/uploads/files/45998053174.pdfIn PDF document text
    • http://cokhixnktientien.com/Images_upload/files/sofuwuxaj.pdfIn PDF document text
    • http://recrute.fr/files/files/52043465461.pdfIn PDF document text
    • https://hoongnau.com/upload/files/86605661388.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+backup+everything+on+my+android+phonePDF 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_off0000ebf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF6 18544 bytes
SHA-256: f24b0debf6f99aee5a429a665d5c3f31a4096083162b53e52021c4c7ee123d6e
font_01_sfnt_off00011b90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B90 11336 bytes
SHA-256: d348846982cd1e78adc4df722a8a588563532523289f561ca1b75388ad01f9ab
font_02_sfnt_off000135ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1