Malicious PDF — malware analysis report

Static analysis result for SHA-256 41da0a73a4a65d92…

MALICIOUS

PDF

85.4 KB Created: 2021-07-02 12:32:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: b7b210c16b6dd36ed6ff42e6baa3b40f SHA-1: 5f6e8796ed80e831f3b6b440c2f797966fb16e58 SHA-256: 41da0a73a4a65d9202d183297b0a8f213447848d93614f96493a4dd15f0b5797
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs that point to various websites, some of which appear to be compromised. The presence of external URI heuristics and link farm indicators suggests the document's primary purpose is to redirect users, potentially to phishing sites or to download further malware. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://alakharia.com/public_html/userfiles/file/93846525667.pdf In PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/3853jq4dmqis4d54v0buvrdak1/bepotiresexupinonada.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/16074a5a94045e---sarafazipo.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/jokekupusagome.pdfIn PDF document text
    • http://kubabus.cz/novy-web/upload/file/lalezejaf.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092276335d1b---41634595348.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/lpmjigd1k3hig2a1qdg87kpsia/mivimozivutujazewegafif.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/juwaguworakafuw.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/d34b156c0b9a174d4e29e9c9894963df/dokibej.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/602rcvsmurnt3lufne9u6330i4/55775043320.pdfIn PDF document text
    • https://infoenergie-loire.org/userfiles/file/zivoges.pdfIn PDF document text
    • http://imi.vc/upload/files/81131048387.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/67057317119.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607270c03f2c2---vuvewuzamilo.pdfIn PDF document text
    • http://ranaghatpchsschool.org/userfiles/file/keduferugibiwepevebefi.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/56042055589.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d315b6b5e---90026294767.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/hnjmo8hlfqs0u6hccjd56ojilo/movuli.pdfIn PDF document text
    • https://jagamimpi.com/contents//files/1995927409.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/qsbj36cm9579ich9t7jml07gv7/tevojedawitudosozi.pdfIn PDF document text
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/rufaduxipojojuvekulilasi.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/k00g56scks4dcph3r7iv3c7omp/62002361545.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c681eb331---nasarepalemej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=taeyc+conference+2015PDF 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_off0000eb51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB51 17268 bytes
SHA-256: 7179d7d5c489253bd57ec3f0e59b13fca98b642b6fb9aae6f1c4ee4cf6f354fb
font_01_sfnt_off00011881.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11881 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013098.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13098 10428 bytes
SHA-256: 2edb6e0eb691408fe010836ae13917af86b8075eec44c55491ba04ffe7c3be12