Malicious PDF — malware analysis report

Static analysis result for SHA-256 55f03a05844892b7…

MALICIOUS

PDF

77.4 KB Created: 2021-09-02 03:56:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5104ea093115518e6111ad365c43714f SHA-1: 1c798139088e30b4168917c398f8ad70877fb60f SHA-256: 55f03a05844892b79af91fe3dda790479aa0dbbcaa84dfbc60c18b46e1798fc2
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting an attempt to redirect users to malicious content. The document body is unreadable, but the presence of numerous external links indicates a likely phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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://netisiletisim.com/guvennet/resimlerfiles/ligizejukidudepinepiboz.pdf In PDF document text
    • https://digidatadecolombia.com/wp-content/plugins/super-forms/uploads/php/files/64334c7a128a6dd648287f54dad33bdc/dubibirorixu.pdfIn PDF document text
    • http://viral-list-monster.com/ckfinder/userfiles/publics/files/24427453566.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///goranupofativ.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/55b75b8e44318998dc87f4635636dc3a/jipubuvunijalibiranir.pdfIn PDF document text
    • http://hnfhdc.com/UpLoadFile/2021082314132233778.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160722502d26ab---jovileleliwabamolujo.pdfIn PDF document text
    • https://khogiaydantuonghanquoc.com/images/news/file/nibinabazefus.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9acb0c7b63---talodenitajasunemubarigo.pdfIn PDF document text
    • https://lexconsulting.ro/webroot/files/media/vugonetitadizopepexopa.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/rukejowufukafu.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f199a5251f---bepezusureleri.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d2303290dd---25113161588.pdfIn PDF document text
    • http://olympusflights.com/files/files/ruleparesevu.pdfIn PDF document text
    • http://bclgrouptt.com/userfiles/file/moluwerubasesopipevelukom.pdfIn PDF document text
    • http://gagutp.com/sa_upload/userfiles/file/20210812074114.pdfIn PDF document text
    • http://myoffice2561.sesao33.net/UserFiles/File/petulakowifesekofepak.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607411f48023e---89640329833.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a19fe86dae4---85915862853.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/6e8dc0b97cb979fb623154297c75c533/39008924445.pdfIn PDF document text
    • http://jngf.cn/files/file/memamujapazufalakabug.pdfIn PDF document text
    • http://biometria.pl/photos_fck/file/buxamifad.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/f95ee19be618c6d7c346b16bbff180a4/14299600194.pdfIn PDF document text
    • http://stevis.cz/files/file/73644577918.pdfIn PDF document text
    • http://masonhn.com/d/files/toren.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/5789991a09b571296499c1c0c62fd1df/51967652923.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=flights+to+barbados+from+detroitPDF 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_off0000ca1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA1E 10812 bytes
SHA-256: d3e82f605cfbfecfb1f242571010ea08f0e1ff72690eabe64d16792428e97b2f
font_01_sfnt_off0000e2d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fae6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE6 17044 bytes
SHA-256: 4127a967a47b7d7fc490d65252a70dfe3c13a3f1cf5b1bff611553a930407693