Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4850e3a1ceb9321…

MALICIOUS

PDF

83.0 KB Created: 2021-09-17 02:50:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 9203a8e206a515a8c9fb2cbd9f6173cd SHA-1: cd5b786cad1f18074afb0805aa6844b764ef06b3 SHA-256: b4850e3a1ceb93212f40f142a0a550930813fd3133edd9edb644af03f3e70785
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ML classification and ClamAV, indicating malicious intent. It contains numerous external URIs and links to potentially compromised websites, suggesting a phishing or malware distribution scheme. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating the document is part of a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://huntic.ru/uplcv?utm_term=osho+living+dangerously+pdf PDF link annotation
    • http://rentappli.com/tinymce/jscripts/tiny_mce/plugins/phpimage/phpimage/upload/images/file/16746819201.pdfIn PDF document text
    • https://vipbeachhouse.com/uploads/editor/file/dewoxiberexipimoxikolopi.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613cae01ca01f---84057708144.pdfIn PDF document text
    • http://cherriestattoo.com/ckfinder/userfiles/files/49552195107.pdfIn PDF document text
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/konewamuzuse.pdfIn PDF document text
    • https://clearpatth.com/userfiles/file/figakexuze.pdfIn PDF document text
    • http://tjsyjdq.com/v15/Upload/file/202191317452865.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/91193797447.pdfIn PDF document text
    • https://bikidi.com/UpFiles/WebEditorFiles/file/buzikigakujizubo.pdfIn PDF document text
    • http://alessandrobelleseveterinario.eu/userfiles/files/wilesobenevevevosokav.pdfIn PDF document text
    • http://finchamauto.com/pics/loneruliw.pdfIn PDF document text
    • http://dlshixiang.com.cn/ckfinder/userfiles/files/2915980937.pdfIn PDF document text
    • https://propactionvehiclesuk.tv/userfiles/files/2560972451.pdfIn PDF document text
    • http://encino.ilovepokebar.com/uploads/files/warogen.pdfIn PDF document text
    • https://kolbandibileklik.com/resimler/files/22705155413.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614215e941ac1---36251133371.pdfIn PDF document text
    • https://acrgruppe.de/userfiles/file/namivik.pdfIn PDF document text
    • https://agronlogistics.com/userfiles/files/42062748600.pdfIn PDF document text
    • http://csc028.com/userfiles/file/20210916111614_63p5l2.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16135dc829cbf5---7947672638.pdfIn PDF document text
    • https://stehovani-ostrava.cz/static_pages_files/file/zixitapixiripa.pdfIn PDF document text
    • https://shatalarab-llc.net/userfiles/files/52204068456.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/103e9da10efb7f5b17efff20b166d5e9/bimozigedegileje.pdfIn PDF document text
    • http://viettranslators.com/webroot/img/files/jafubupujuwadumalep.pdfIn PDF document text
    • https://sportuna.be/ckfinder/userfiles/files/15951165276.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_off0000db17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB17 18936 bytes
SHA-256: 3d65281915a6c1a63c6149fede1e46c8e0e7535aa184322c6807e18c0a94fbfd
font_01_sfnt_off00010cb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB6 10984 bytes
SHA-256: 83a024512a6af3f51339d08e3efb08eea2a5b10ed238cf96418f45e52015536d
font_02_sfnt_off000125f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1