Malicious PDF — malware analysis report

Static analysis result for SHA-256 b66e5a6bc65cfb78…

MALICIOUS

PDF

85.2 KB Created: 2021-09-01 21:46:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ef27d3bbf854e100b2e27ad605a731f3 SHA-1: dc99be1ea1d5831154248c87639bc2b4e670edb6 SHA-256: b66e5a6bc65cfb780e2b41240637f034589badb54e9f02db19566a2324d73517
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. Multiple heuristics indicate the PDF contains numerous links pointing to disposable hosting and compromised CMS upload storage, suggesting an attempt to lure users to malicious sites. The embedded URLs and the nature of the heuristics strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://andlupa.com/userfiles/file/lutunezitewiminukif.pdf
    • http://aminotp.com/upload/files/20063816892.pdf
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/27417839051.pdf
    • https://eastmangroupllc.net/ckfinder/userfiles/files/tikerovoxomizaguf.pdf
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076d9acbc200---sagup.pdf
    • http://btc-ltd.com/upload/file/99651095273.pdf
    • http://netmutum.com/userfiles/file/15492833087.pdf
    • http://elcampoeco.org/FCKeditor/file/65797462929.pdf
    • http://quangcaosms.org/media/ftp/file/gazovabelujugobovomab.pdf
    • http://partnerplus30.ru/images/fornews/files/75283868461.pdf
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160813231eaa1d---bejekimege.pdf
    • https://virker-ikke.dk/files/lufemiwe.pdf
    • https://nepalipublisher.com/ckfinder/userfiles/files/79736611016.pdf
    • http://www.irrv.org/uploads/files/44666811632.pdf
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6953952876---30684887048.pdf
    • http://alpha-cp.com/userfiles/file/43287695703.pdf
    • http://peoplefineart.com/assets/202108/files/20210823155100270441.pdf
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609104a9d7a4c---27372995533.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/0e6876824d8f55902ef52b69ba1cf995/pazitesoto.pdf
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bce89958bff---wulexekenom.pdf
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/h93ggs4pjge29rh99s8m24rgv4/metajefubok.pdf
    • https://mangonebike.com/uploads/file/sepuvutukelena.pdf
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/160db8d37a3f42---rigivivuz.pdf
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca8a5851998---92416998475.pdf
    • http://scbczy.cn/up_files/file/20210813_102713.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=gst+for+land
    • 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_off0000e8d4.bin
acc50608f6d93edf9f9b3f3b6edf2bfd7489aed4e387257ac74beefea36552a8
pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D4 10164 bytes
font_01_sfnt_off0000ffba.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFFBA 16792 bytes
font_02_sfnt_off000117cc.bin
5cb921dbc80f20de56a2935b414c0de6b8833e906298674c9f66fbca1627b8ef
pdf-font-stream PDF embedded font (sfnt) at offset 0x117CC 18044 bytes