Malicious PDF — malware analysis report

Static analysis result for SHA-256 79df304d1aa93cfc…

MALICIOUS

PDF

93.7 KB Created: 2021-07-06 15:07:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 8e2fa835efb2f1d9ff15c4961d421522 SHA-1: 12f0bcc4d56e1bbb2cb3bda78124454a8e15951b SHA-256: 79df304d1aa93cfcc9d587069a014cdc19d3e1e1bccb2c95b9a6c316f3aad338
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites hosted on compromised CMS platforms, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of multiple distinct hosts and a high number of links per host further supports the classification as a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/m0tg6fe64ls6jil94bmo0vn9e7/sewukizasogigetefo.pdf In PDF document text
    • https://foodphotoshop.com/userfiles/files/51377088567.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/bimilasonivagevas.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080a7efb3290---86236767684.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/60092858150.pdfIn PDF document text
    • https://mygoaltv.org/ipp/images/uploads/files/dasijudadogakuvewowovoz.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/fot4pmp2m5n6d8otglvlgk3erc/jijikizufumumudowus.pdfIn PDF document text
    • http://slp72.com/clients/7/7b/7b902bee17765b19ebdde6030f24742d/File/30073453139.pdfIn PDF document text
    • https://marbellamohali.com/wp-content/plugins/super-forms/uploads/php/files/54052889d9753015ce6adecea0379769/57273281099.pdfIn PDF document text
    • http://grandinhr.eu/images/user/file/53915988696.pdfIn PDF document text
    • http://dzbnf.com/upload/file///bopatupijotukitosa.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/96248632688.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160bf9f543dae6---vavusip.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/e03c7ef9a3336f3b36803f4ceb556f5f/36236420206.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16074b960ba982---vizedodofifanigarinu.pdfIn PDF document text
    • http://poolprotektor.com/userfiles/file/xidutajigorabuxakazajaxe.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/abc952fbc688ab701551a4f614b47e7a/75262689197.pdfIn PDF document text
    • http://gabortech.com/admin/file/82012999711.pdfIn PDF document text
    • https://bbu.vn/Images_upload/files/85052140135.pdfIn PDF document text
    • http://www.conectadoscomdeus.tv/arquivos/file/dijakegu.pdfIn PDF document text
    • http://danchrisjewelry.com/userfiles/file/63608203175.pdfIn PDF document text
    • https://travelone.ae/userfiles/files/wefaz.pdfIn PDF document text
    • http://arc-en-cielproduce.com/ckfinder/userfiles/files/vorapoguladilipez.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/05e5e67c4615b590f5c593bc2a15697d/45401811141.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609201a442be8---16494702506.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=sports+direct+discount+codePDF 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_off00010b1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B1E 17700 bytes
SHA-256: 3c31953c8e0b167bedcd9288b1c7ab6083609028be85b67d1ab8cf4d8245419a
font_01_sfnt_off0001398b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1398B 10476 bytes
SHA-256: 31d13fc766ec53d70481c14ee3579fa547943cf087b457c288b51bd1528b3166
font_02_sfnt_off0001516a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1516A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1