Malicious PDF — malware analysis report

Static analysis result for SHA-256 1690005cb6d8f03e…

MALICIOUS

PDF

92.7 KB Created: 2021-09-15 17:14:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 693e72948c7f208de38d32955079002f SHA-1: 584db4ff4f2261f0aa681e2bec2f53c0d66e1583 SHA-256: 1690005cb6d8f03ebc32e419c0958031fa99d3d06aadef0d3dec324510203774
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised WordPress sites, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://smidgel.ru/uplcv?utm_term=old+2nd+line+apk PDF link annotation
    • https://el-tall.pl/pics/file/netagajulexo.pdfIn PDF document text
    • http://cudicio.it/images/file/rowawaxesixew.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/16138d813d210d---5747771699.pdfIn PDF document text
    • http://libron.pl/fckupload/assets/file/jimebij.pdfIn PDF document text
    • http://library.nesdb.go.th/ic/admin/ckfinder/userfiles/files/75877623552.pdfIn PDF document text
    • https://eastoncn.housemember.com/uploads/files/subopeforewuguripiliwaz.pdfIn PDF document text
    • http://zhhyhb.com/uploadfiles/files/65677615103.pdfIn PDF document text
    • http://resheto.ru/users_images/fck/file/sajepuginogido.pdfIn PDF document text
    • https://jmbarrenetxea.soinuenea.eus/files/galeria/files/14789633045.pdfIn PDF document text
    • https://theptaynam.vn/upload/files/81342189921.pdfIn PDF document text
    • https://guruvinodji.com/Userfiles/file/40644859209.pdfIn PDF document text
    • http://westfallassociates.com/documents/file/65634363183.pdfIn PDF document text
    • http://muasamhangmy.com/ckfinder/userfiles/files/71556541663.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/3looem1lhgnhiirf4tcv48v4t9/bokezitenugizuzeju.pdfIn PDF document text
    • https://telenovella-bg.com/files/78089889439.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/ocptlnve2gj8eo6nr9ipqjfdbq/83990161931.pdfIn PDF document text
    • http://jcpingie.be/public/files/fuxag.pdfIn PDF document text
    • http://roycraft.ca/userfiles/file/70370445522.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fefe46d8f9---fodizaxofegazifirajerox.pdfIn PDF document text
    • http://infiniti.e-library.tw/uploads/files/kitow.pdfIn PDF document text
    • http://snsi.jp/image/news_file/5194042953.pdfIn PDF document text
    • https://ruxthai.com/ckfinder/userfiles/files/8225156762.pdfIn PDF document text
    • http://antonellascarpittadesigner.it/userfiles/files/remoganobatekojabono.pdfIn PDF document text
    • http://jfhcoaching.nl/userfiles/files/15362235628.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_off0000ffe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE2 20920 bytes
SHA-256: 2d397678cc05469be10fe2ffc3ac5f9e33d5a4d412feb56f1cec2f0523156514
font_01_sfnt_off00013682.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13682 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014e99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E99 10136 bytes
SHA-256: ae2d12c4640d23bc54e02c1d4cf4cf3055ce84c4430af160bc3e0a7fab7dfd07