Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2b483c1f6badced…

MALICIOUS

PDF

74.0 KB Created: 2021-09-13 00:54:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c52da2af7978904b4d95bf8f06604639 SHA-1: e3351358d189c5216bf1c663ab82571d1d03916f SHA-256: e2b483c1f6badcedc13f80a0e732ad63e1d410105e7b56260e5e64fe9a316005
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are consistent with a downloader or phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://metrominicabs.com/survey/userfiles/files/dukulusaxasikopefunodizol.pdf
    • https://alrashed-alsaleh.com/userfiles/files/datakekejafaginepogi.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/hd2vbhf08bqt0g12trsmebukg4/maxowebirobosigavufoguguz.pdf
    • http://xnucleus.com/members/member_images/files/80024170556.pdf
    • https://ptkas.com/kingkong/userfiles/files/65872967140.pdf
    • http://robertfeinberglaw.com/images/edit_images/file/fopizivomurofukalesev.pdf
    • http://jsushibrea.com/uploads/files/renebagevorakixekonuf.pdf
    • http://staropolski.net/Upload/file/nododobuxawuwid.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe05e377b0.pdf
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6a9a2f2ee---nafumir.pdf
    • https://cosmopolitanhotel.lastrada.bg/uploads/wysiwyg/files/43171033832.pdf
    • http://dorinhawear.com/admin/fckeditor/editor/filemanager/connectors/php/fckeditor/editor/filemanager/connectors/php/userfiles/file/1714209144.pdf
    • http://ivankrivanek.com/userfiles/file/karewekebu.pdf
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613d4aa018570---zodoj.pdf
    • https://almuhja.com/ckfinder/userfiles/files/58958573344.pdf
    • https://giridhareye.org/ckfinder/userfiles/files/nopimir.pdf
    • http://www.startbatteries.gr/ckeditor/ckfinder/userfiles/files/41910645694.pdf
    • http://gestioniarmatoriali.it/57860192757.pdf
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/bd7npue9hf771m7og8m27uflor/zimoxixanuwij.pdf
    • http://izhar-energy.com/userfiles/file/rubujelibasujejamapu.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=move+obb+to+sd+card
    • 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_off0000bd75.bin
43933d3568b69170f60be3ce9da9e0398084bde90cc09d8f0d1f3618e55c773e
pdf-font-stream PDF embedded font (sfnt) at offset 0xBD75 17840 bytes
font_01_sfnt_off0000eb9d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9D 16792 bytes
font_02_sfnt_off000103b4.bin
cae9f99e9885e50df45f5f4bb3e166d457ee4bd23bb7b99790bf592652cb23dd
pdf-font-stream PDF embedded font (sfnt) at offset 0x103B4 10320 bytes