Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f869a798162797a…

MALICIOUS

PDF

82.2 KB Created: 2021-09-17 21:45:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 142bc62a13b961ce5015d029da71bf8d SHA-1: 0e2385d83daf9ac13c37a81e66a45b553a71b68f SHA-256: 2f869a798162797a92bf98378fe9f7980f56a33f24aed96f33981821c7f6e386
96 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised websites or link farms. The ML classifier strongly indicates maliciousness. The primary purpose appears to be redirecting users to potentially malicious content, leveraging compromised CMS uploads for hosting some of the linked PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • 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://jakspravnenapsa.cz/userfiles/file/mawavaw.pdf In PDF document text
    • https://samowar.me/userfiles/files/xijadiwobimunupojif.pdfIn PDF document text
    • http://ziguratex.com/helpdesk/app/webroot/img/userfiles/files/salanelamagu.pdfIn PDF document text
    • http://janaturismointegrato.com/uploads/file/36408135048.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/161378091982ee---fipomugodifulad.pdfIn PDF document text
    • https://needletherapy.eu/upload/file/74429820975.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/f5289715ecb85d39b26d88ea8fe7c48a/fatotijijujevuxuno.pdfIn PDF document text
    • http://easyhypermarket.com/userfiles/file/15367783083.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f681a9782c---55004411550.pdfIn PDF document text
    • http://scsychem.com/upload/files/21030138442.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/73376302300.pdfIn PDF document text
    • http://zkojicin.cz/userfiles/file/dotusinad.pdfIn PDF document text
    • https://manajrgvaaradhi.com/cms-uploads/files/solukilila.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b1ac157039---jujekerikomogapomajajelub.pdfIn PDF document text
    • http://talesma.com/E/file/direre.pdfIn PDF document text
    • https://chiuman-hk.com/images/file/dakafetimojimowuwu.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/551167738fa6deb805634e927d783628/bedarovedemaj.pdfIn PDF document text
    • http://kleni.cz/userfiles/file/14681319887.pdfIn PDF document text
    • https://norservis.cz/files/files/17445434125.pdfIn PDF document text
    • https://hrmconsulting.biz/upload/files/99528114590.pdfIn PDF document text
    • http://dc-a0dcf319a153.breakthroughsport.com/userfiles/files/watikaverawarovukos.pdfIn PDF document text
    • http://szentdorottyapatika.hu/files/godojezovifumemeles.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613af5b5a3432---55034846517.pdfIn PDF document text
    • https://sahyadrisevasanstha.in/userfiles/file/34583302817.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=mahjong+city+tours+mod+apkPDF 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_off0000dcdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCDF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F1 17288 bytes
SHA-256: 8cc53a78d1814366f524387d6473a31ebd94c498e6c985b0e264909a96afe5a4
font_02_sfnt_off0001213f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1213F 11212 bytes
SHA-256: c11e9aac7c66bfbba5f71a0df14a3316ccf58741763a1109c8fba41a5e94f3d2