Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5d5e77a58d3efb4…

MALICIOUS

PDF

80.9 KB Created: 2021-09-01 17:01:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4a00bdcb6d5815100970aef70d18a406 SHA-1: 2fa62386938f87cd505def7b80e1bf85413d40cd SHA-256: e5d5e77a58d3efb4d41681d05ce5e94187dc1474773eeb63831a31e7d0f0ea5e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is a common technique for executing malicious code. The file also features a link farm pointing to compromised WordPress uploads and disposable hosting, indicating an attempt to redirect users to malicious sites. The ClamAV detection and ML classifier strongly suggest a phishing or trojan payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/ce77ecf7461f106039a8fc028cdd357e/liwutavepimozinabomezelip.pdf In PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/m1qvmkij3n1uc9aa1ueff0s131/70201621322.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/dmdjj7s01eir7c53c30g2m6qi4/52895842122.pdfIn PDF document text
    • http://gptools.net/userfiles/file/87222452141.pdfIn PDF document text
    • https://relans-nn.ru/images/docs/file/79315120261.pdfIn PDF document text
    • http://airsoft1.ro/files/file/35598168482.pdfIn PDF document text
    • https://31app.com/userfiles/file/susavosab.pdfIn PDF document text
    • http://eltprof.ru/userfiles/file/20975477614.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f8e475a832862fc64b52db6c054fc582/gisefuwevosudav.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/ce8f8753814a68cf45b92dd3f54e63f3/29204312075.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088c5ef1dbfb---15134704100.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089a831ede24---56048121748.pdfIn PDF document text
    • http://motoren-adachi.com/js/upload/files/vamukug.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16098ad07e655a---58611628429.pdfIn PDF document text
    • http://anticacarsulaeborzoi.eu/userfiles/files/77403399754.pdfIn PDF document text
    • http://chiengthai.com/file_media/file_image/file/jiwajemunonulejo.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b2975b4b147---64885119687.pdfIn PDF document text
    • http://mirai-kankyo.com/userfiles/files/rozudilepa.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/2ff2adb9442b9cfed42a6e27849f18c1/wodipaf.pdfIn PDF document text
    • https://jiu-hang.com/upfiles/editor/files/lamufet.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/97f86ab54a2661b2b359616145794e73/52015908668.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a28b86d3771---38573931015.pdfIn PDF document text
    • https://adasms.fr/userfiles/file/wisowetifolesezofofurozar.pdfIn PDF document text
    • http://przedszkolenisko.pl/userfiles/file/95062185728.pdfIn PDF document text
    • http://gardenofsound.com/userfiles/files/11341053035.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=symbol+of+main+fuse+board+with+switchesPDF 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_off0000d6c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eed9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED9 17460 bytes
SHA-256: a0f1f836c9b0d366292e2b213126d807b6c6d486c179b291286da9e4d9e02efa
font_02_sfnt_off00011b72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B72 11256 bytes
SHA-256: 592045a25961728f2b682f9300b18d09802091619e6856a7ff1d865ee7bd41ae