Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b25eab6748b4e8c…

MALICIOUS

PDF

81.0 KB Created: 2021-10-16 00:50:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f3d9b7a5734498d24c188cf20f301ef4 SHA-1: c7dc7f0ad5b48104f1305e9373505519ee5bebf3 SHA-256: 2b25eab6748b4e8ca3bb05bdc35b129992f6967e7dcaf0efbb39531eedadeec9
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple domains, some of which are hosted on compromised CMS uploads or disposable hosting. The primary purpose appears to be directing users to potentially malicious or phishing content through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://absolutelyneon.com/userfiles/file/66863177947.pdf
    • http://giteduguedesboires.com/userfiles/file/55144868588.pdf
    • https://masterjobintl.com/ckfinder/userfiles/files/soxirol.pdf
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/dm24mgn9mhbd2cv9btesr5tsi6/gipojasikig.pdf
    • http://global-leasing-management.com/uf/file/36041344159.pdf
    • https://used-machinetools.ro/app/webroot/files/userfiles/files/worawosusotesudoja.pdf
    • http://wisdomtours.net/upload/file/fofudegija.pdf
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/5odab0g6dvalsuptp3kvk3i9qd/92933479452.pdf
    • http://budgettranslation.hu/sites/default/files/file/68273653926.pdf
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/47da631fafda56fcdcc1c47e9491513f/52301740651.pdf
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/161514051137b4---51053642525.pdf
    • http://st03.it/userfiles/files/46515363317.pdf
    • http://buren-kompanie.de/userfiles/files/todesapuwewekepit.pdf
    • http://homeopathyhongkong.org/files/zufuvejikezibejetik.pdf
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/dlaegiafidmevodibek70hd05u/74452523486.pdf
    • http://laptopplus.be/app/webroot/files/userfiles/files/98830774693.pdf
    • http://vako.vn/app/webroot/uploads/files/totebupeg.pdf
    • http://www.tiendadelbordado.com/ckfinder/userfiles/files/mekekumikifugapil.pdf
    • http://cuspsurgeons.com/userfiles/file/33886522820.pdf
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/161426d55715d5---52007525545.pdf
    • https://drbumbnursinghome.in/ckfinder/userfiles/files/vipezewuzodovebu.pdf
    • https://bfull.ru/uploads/files/musorixep.pdf
    • http://feedproxy.google.com/~r/Xvkpad/~3/2I9n2o-U8HI/uplcv?utm_term=the+giver+book+ending
    • 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_off0000da3c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA3C 16792 bytes
font_01_sfnt_off0000f253.bin
c4208b951a6c8aca1bc9f4692a3d70b7368ef20896c24498b451e40189a513a8
pdf-font-stream PDF embedded font (sfnt) at offset 0xF253 10316 bytes
font_02_sfnt_off0001093c.bin
1baebcb87cdabf48054877f59a137bf9ccc6da4d18d9ac4b5149496ee42fce3f
pdf-font-stream PDF embedded font (sfnt) at offset 0x1093C 17848 bytes