Malicious PDF — malware analysis report

Static analysis result for SHA-256 61857c2fd63404ee…

MALICIOUS

PDF

74.3 KB Created: 2021-08-22 03:10:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 2689619efc6d9591c93aee42acd1b65d SHA-1: 7ffd5d416e4fadf0661c99500b6b220dbd608fe0 SHA-256: 61857c2fd63404ee200cdca5bb524eb42fd6318a08bbd417d9620196a62e5f7f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that point to various websites, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm structure, and the 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' firings strongly suggest malicious intent. The document body is heavily obfuscated and unreadable, but the presence of external URIs and the link farm structure suggest the primary goal is to redirect users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://garglob.ru/uplcv?utm_term=surah+manzil+quran+ki+aarti PDF link annotation
    • http://podiummoda.ru/userfiles/file/kazatodaviwibivilep.pdfIn PDF document text
    • https://rocksoliddesigns.biz/userfiles/file/19626006129.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/24ecq08u5gsheq2ci1a5h63npl/42825105544.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607d84b04f0e2---20228973813.pdfIn PDF document text
    • https://egca.fr/userfiles/file/76660602261.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/zelojatemosu.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5a4d2b3e97---6214639448.pdfIn PDF document text
    • http://esistore.lu/userfiles/file/dazonajazami.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/5dd913128f76719328c3e67121968930/votogozimid.pdfIn PDF document text
    • http://canxetaianhduc.com/images/file/ruxukimevuruf.pdfIn PDF document text
    • http://epmresearch.org/userfiles/files/lokubodefenusajisasizax.pdfIn PDF document text
    • https://avela.md/userfiles/file/92543834859.pdfIn PDF document text
    • http://papierplus.pl/userfiles/file/37044328086.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160c8de6ca4a41---44345799812.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/30145679547.pdfIn PDF document text
    • https://www.dooleysnaturalgas.com/ckfinder/userfiles/files/radut.pdfIn PDF document text
    • https://www.frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/58115595358.pdfIn PDF document text
    • http://eastcoastbiker.de/sites/default/files/file/lalite.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a9908c18957---54501229492.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/jkrdjoc6dsrh44qh2itendon3u/44276932419.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/ginijopasurokona.pdfIn PDF document text
    • https://royal-art.pl/uploads/userfiles/files/bekafuwozaxamefateral.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607cffd081909---52247135960.pdfIn PDF document text
    • http://heibldr.hu/FCKfeltoltott/file/57725510621.pdfIn PDF document text
    • 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_off0000bf87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF87 10424 bytes
SHA-256: d22ad47a00c675c16148ca74ab5bc78f9609cee40f22b5aa23b1579c41f3a4fb
font_01_sfnt_off0000d6ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6EA 16908 bytes
SHA-256: 07d25f2c9955503f572206c5c95d637b3efc7ad31b699868e336cb9e7a31fd6e
font_02_sfnt_off00010290.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10290 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1