Malicious PDF — malware analysis report

Static analysis result for SHA-256 78a7f94b39c7fb14…

MALICIOUS

PDF

91.0 KB Created: 2021-07-05 00:07:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 42264f1ef72fccd4a4de9a68592d459e SHA-1: 874a838f01ade371b909dd3d05f17faa89f50ce6 SHA-256: 78a7f94b39c7fb14d9eb5ad0f7ef5f15c47049e1916273b78f019f2fa9b5284d
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to potentially compromised WordPress upload directories. The presence of these links suggests an attempt to lure users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16097573c2ea57---69018731483.pdf
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160769234b4bf7---titarafupanejapufizome.pdf
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/2f038a9eccd9d4397c80a16985e37ea4/ginovuzopilikixukefuxagig.pdf
    • http://icltindia.in/userfiles/file/puxeradulolutekuminim.pdf
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/qmocmm3iqs5hgiuub44n5a2h57/mivekijog.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b99a523c85---46003296304.pdf
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f280f9c1d5---baboluz.pdf
    • https://planet-for-events.de/userfiles/file/jawububogor.pdf
    • http://www.allatpatikapecs.hu/images/file/nujejimexefade.pdf
    • http://www.advokat.com/app/webroot/img/fck/file/59185403146.pdf
    • https://fenixfalt.com/userfiles/file/lewivizurawururawubiduje.pdf
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079ba592b0b7---nabefutoxotebetapan.pdf
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607c6e350fd3d---viponiser.pdf
    • http://alpanelektrik.com/depo/sayfaresim/file/97192179432.pdf
    • http://wisdomtours.net/upload/file/78956158104.pdf
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16073cfeae36b1---lobaroxuxesutosidorazuv.pdf
    • https://ooo-kenk.ru/userfiles/file/94126247944.pdf
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608035f652bf1---79459841150.pdf
    • http://hoigolfbinhthuan.com/users/files/liduvorapiranitibogixuzar.pdf
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1607a43c1dff43---82481357426.pdf
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/oeraglr6lk56v92i6khib9bll0/wosatovigeguxarokuzaza.pdf
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b0c2d6c01f---27980556155.pdf
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/02aad315972d14114c88b12f4d57d149/watozopalesivutowo.pdf
    • http://osc-pribor.ru/products_pictures/file/xisuzimajuwevipamov.pdf
    • https://giriconsultancy.com/content_files/files/14736102952.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=create+georeferenced+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010242.bin
c85f8a0aedd1a999ec5ba3a9fd5929282abbad4f5d32d15f36fce5405382ea53
pdf-font-stream PDF embedded font (sfnt) at offset 0x10242 10520 bytes
font_01_sfnt_off00011a22.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A22 16792 bytes
font_02_sfnt_off00013234.bin
b69d788ff7cb24ff01b6e22fb5bc54feafce6498c203babca287eddfbe3e14b8
pdf-font-stream PDF embedded font (sfnt) at offset 0x13234 17112 bytes