Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4acc760a149ad85…

MALICIOUS

PDF

73.6 KB Created: 2021-09-26 01:58:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 723a9ad6d00c4e77e485fbd4ae26644b SHA-1: c77548445b6e9a2808cbbe11d9807640b14d049b SHA-256: c4acc760a149ad85aef6d8cc641226249de83b7852c7363f16ab1aa1c9ac5f8d
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple PDF link farm heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://ippon.lv/uploads/File/nisefikoza.pdf In PDF document text
    • http://sakurahoaanhdao.com/webroot/img/files/85667270462.pdfIn PDF document text
    • http://forspeed.cz/ckfinder/userfiles/files/vagepi.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/7v3j3l93l6qohcjm1n1vbli3e1/10885486354.pdfIn PDF document text
    • http://casavacanzesanvito.eu/userfiles/files/54383188265.pdfIn PDF document text
    • http://netmode.net/app/webroot/uploads/files/2719346703.pdfIn PDF document text
    • http://dalnoboy.org/data/filestorage/upload/files/xizikuv.pdfIn PDF document text
    • http://uniontsg96.ru/admin/ckfinder/userfiles/files/dafamuvafenurif.pdfIn PDF document text
    • http://highgaincomposites.com/img/file/202191305044.pdfIn PDF document text
    • http://dungculamdep.com/fckeditor_userfiles/file/46984392081.pdfIn PDF document text
    • http://isagenixmakessense.com/ckfinder/userfiles/files/zufasemo.pdfIn PDF document text
    • http://valentine.tutaylamhet.com/storage/ckfinder/files/vasazalunutabi.pdfIn PDF document text
    • http://westfallassociates.com/documents/file/pagipajajuw.pdfIn PDF document text
    • http://quangcaosms.org/media/ftp/file/jeburomeririjavimejavife.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b556eaa222---91328852189.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/92ee9c0929b0507d7f6db21951cce6ae/67572972621.pdfIn PDF document text
    • http://lesbambousbleus.fr/ckeditor/upload/files/88277202662.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/jenoloxovafaxegovanafo.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16138469ecd472---2414250260.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/82d2684353fa84d0d7be9ba6f5cd57b3/46836179775.pdfIn PDF document text
    • http://canoeing.by/pics/files/matexerodetu.pdfIn PDF document text
    • http://hurtowniagrafit.pl/userfiles/file/11471342765.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/fbb020fc97b58d0f84a008807de889a7/73809628429.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.fr/userfiles/file/mopesow.pdfIn PDF document text
    • http://flexa.cz/docs/file/32399174495.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=how+to+get+the+photos+which+are+deleted+from+galleryPDF 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_off0000b732.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB732 18256 bytes
SHA-256: d73611c3d0908660329b17604a36446f549c344bc3b4a76164a40a843eecc238
font_01_sfnt_off0000e5df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5DF 11156 bytes
SHA-256: 38481bd3467acb5a6acc21875772a582e41877c940d1edae44f4b3c0d8b908d8
font_02_sfnt_off0000ffd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1