Malicious PDF — malware analysis report

Static analysis result for SHA-256 59789f677b26cc36…

MALICIOUS

PDF

80.5 KB Created: 2021-09-04 03:18:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 71d9b7f84f6fb111ccc103dbe3804cb0 SHA-1: bb2eb38e2b4f879163d25df976b0e068a9960623 SHA-256: 59789f677b26cc36dcaf92c75db5aeef923f583a9d8f51c80a2f70b05b5ff13b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS uploads and disposable hosting, indicative of a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the structure and URL patterns align with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/c7f00380c008d99b671fd9f21be90424/gitevenokonutatadazari.pdf In PDF document text
    • https://theelementrama9.com/userfiles/files/81318122443.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/mumiwimaj.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160903d09728bc---89892894529.pdfIn PDF document text
    • http://caopump.com/admin/userfiles/file/kezesetupumazexasidimo.pdfIn PDF document text
    • http://ncdesign.it/userfiles/files/dinodet.pdfIn PDF document text
    • http://xn----9sbbnbtte4cyg.xn--p1ai/ckfinder/userfiles/files/53896608376.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/bb307fed253af018608334bbcce3cbb1/pajakikasuzudujovusik.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/be507d0f0e8b6c14ead1d30629711cb3/pawarir.pdfIn PDF document text
    • https://xanbiente.de/userfiles/file/wogixididekenaw.pdfIn PDF document text
    • http://www.trafikyaren.com/wp-content/plugins/super-forms/uploads/php/files/7ikp59qia1km1rgv8uvk8pj054/gevememazarepeviwelexo.pdfIn PDF document text
    • https://www.bbmnetlicitacoes.com.br/cms/ckfinder/upload/files/41937244984.pdfIn PDF document text
    • https://aiaciran.org/cache/fck_files/file/2423213083.pdfIn PDF document text
    • http://raykingcarroll66.com/clients/2/29/292092747e06e0ab09130fa737b110c0/File/86757606964.pdfIn PDF document text
    • https://medius.sk/userfiles/file/49014307980.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/8c2f17297b3dd72427fb0e44ca7edab2/31078463529.pdfIn PDF document text
    • http://nebovsem.ru/app/webroot/files/files/44747761957.pdfIn PDF document text
    • http://ferrocom-spb.ru/userfiles/files/merepizugorilamup.pdfIn PDF document text
    • http://piazzademarini3ge.com/userfiles/files/65731826177.pdfIn PDF document text
    • http://xhiehchin.com/Xhieh_News/_file/dawebo.pdfIn PDF document text
    • https://stiff.pl/ckfinder/userfiles/files/67345415237.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/780cd7525cb8cfaceea77da146016246/tejifujiwonotudow.pdfIn PDF document text
    • http://hsi-international.com/ckfinder/userfiles/files/46618871266.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/45112174958.pdfIn PDF document text
    • http://uitvaartverzorgingsindex.nl/images/uploads/fubozovone.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=legendary+acoustic+guitar+songs+pdfPDF 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_off0000d5d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5D8 10920 bytes
SHA-256: 0703d9d1452eb0615cade8e303d77af7b74d4a89cb7263577d8ce43481d58b2a
font_01_sfnt_off0000ef17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF17 17332 bytes
SHA-256: 30bda5aed987d37307f2f122c5da396857bf7f40600224ed24ac3fcb752e2187
font_02_sfnt_off00011c01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1