Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a9a5b8857ea0303…

MALICIOUS

PDF

87.4 KB Created: 2021-07-03 20:51:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7097b11c863290897585c91e4c5fdf0f SHA-1: d651e7b7cdd67d9e7a1f55bafa18d6304ac55100 SHA-256: 2a9a5b8857ea030308e7b71eb2f9832b034ad61e9f7b3ef8daa437e3558936e2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many of which appear to be hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to distribute malicious content. 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 0.9942

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://inwebjor.ru/uplcv?utm_term=hotpoint+dishwasher+manual+lft228a
    • http://fiumaradelsossio.it/userfiles/files/83971383072.pdf
    • http://cnex.cc/images/blog//file/vizimobuzoseganomegawa.pdf
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/me1290d61n2aiqchgvhkffkd6o/bolebuvolopubevatoso.pdf
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/p51veb8315ehqkkp0jo82tktlg/ravisanasulirezuzaz.pdf
    • http://workcoop.org/fckeditor/userimages/file/20210603204631.pdf
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608edbd5550ab---44472051882.pdf
    • https://kontiko.com/ktkweb3/images/upload/files/kubilapa.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/01d90420959f93c41e88b8a1853d4743/kexuwode.pdf
    • http://beta-rc.com/upload/files/lizudemijuturekixot.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/d979910cec500c46afd9629f3bd2adc1/88713865200.pdf
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/a1d0385833fc623959549911fd27ad91/83912324227.pdf
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/4d1748eebc47b042823270dc8f3ccc10/fowonebodosojuweruzi.pdf
    • https://asset-books.com/userfiles/file/faditijolejamakalunawi.pdf
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/06c45e4c9662921b3a97786276927cd3/14331743709.pdf
    • http://1960vonsteuben.com/clients/d/df/dfb5e1b83ea85bfdc5ef1da934264264/File/zewemalox.pdf
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/fb0e85eb7e3a8ea596787618dd372bfa/ruwakogo.pdf
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb9f15cca2---79396730582.pdf
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/41327b733f31cbf319bbd10f6159bd20/12164034759.pdf
    • http://neilreardon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xusibezobunoten.pdf
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160701ab30d1f7---14434114516.pdf
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/bt5sdac9redpab47urfghiog9s/14562041849.pdf
    • http://alpha-th.com/userfiles/file/5573681938.pdf
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16089c2ec16b3f---8891220075.pdf
    • http://industrialdevices.in/uploads/voxalojuvofepozudewesaz.pdf
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/b28c167d4ae108b9b054e55a345f7a4c/rinibupotikoruk.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_off0000ef00.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF00 16792 bytes
font_01_sfnt_off00010717.bin
674c8c60c3989fef095bef7489f9fcafdff1a3782311329d4ca0c4bbb297ad14
pdf-font-stream PDF embedded font (sfnt) at offset 0x10717 11268 bytes
font_02_sfnt_off00012165.bin
b00d6c0d002286a7117161cb0f0c577e2237fc98ebb00a1499dd56b4660659c1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12165 17700 bytes