Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba59cc9ec9a7e7d0…

MALICIOUS

PDF

87.3 KB Created: 2021-09-16 10:22:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1dcbae9760754162c2c8f99a91de8bba SHA-1: bb8dab9b9f2672ce7b54495ad1e7c724a64b458c SHA-256: ba59cc9ec9a7e7d0d6d94a4bbbe18b8b39ba10517366028054dcff15ba5ff94d
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting. The document body is unreadable, but the presence of numerous external links suggests a phishing or SEO-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://hotelalbicia.com/userfiles/file/24746761533.pdf In PDF document text
    • https://manpowernepal.net/ckfinder/userfiles/files/48397076993.pdfIn PDF document text
    • https://westhigienia.hu/editor_up/besuxafufopifebozul.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f4cd491e82---nemexarobekosodedakidir.pdfIn PDF document text
    • https://alaqart.atelierleuthold.ch/userfiles/files/80205502704.pdfIn PDF document text
    • https://tktravelkorea.com/FileData/ckfinder/files/20210910_7905A63985AD8D82.pdfIn PDF document text
    • http://biznesfishki.ru/files/userfiles/files/wobonagugamodejipome.pdfIn PDF document text
    • http://charivne.info/images/file/37966060160.pdfIn PDF document text
    • https://marljivo.hr/userfiles/file/werapewexulasasuxurox.pdfIn PDF document text
    • http://praconsulgroup.ru/pict/file/xoduga.pdfIn PDF document text
    • http://sibinetweek.ru/userfiles/file/pesukifolo.pdfIn PDF document text
    • http://abwessex.com/uploads/files/romalukif.pdfIn PDF document text
    • http://flairpens.ru/uploads/files/zokejugarej.pdfIn PDF document text
    • https://bimstudioinc.com/media/files/navoduwufi.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef9b71bfd1---31336579382.pdfIn PDF document text
    • http://rosesrealtyhomes.com/userfiles/files/39101643269.pdfIn PDF document text
    • http://www.louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/69585974506.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/75b44a753007fafcedef9f328c78e223/85861296886.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613e7fd0d1e51---21008681459.pdfIn PDF document text
    • http://vikingpaint.com/user_file/file/68851659576.pdfIn PDF document text
    • http://laser-piskovani.cz/democms/userfiles/file/govizetutanuvorojevixa.pdfIn PDF document text
    • http://luberoff.com/userfiles/file/romekamaxoje.pdfIn PDF document text
    • https://peltonfell.org.uk/ckfinder/userfiles/files/metarom.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/16130adfc3e9a5---fuwerunezaturutopow.pdfIn PDF document text
    • http://xn----7sbezcba9a5aggb3j.xn--p1ai/ckfinder/userfiles/files/xikituwa.pdfIn PDF document text
    • http://actinq.nl/upload/file/rigarogosimiwetamofifuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=analog+clock+app+for+androidPDF 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_off0000ec6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010485.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10485 10468 bytes
SHA-256: 0de21e87b81a801d35356c3659ccd11411724843075eb3d10bbd6ad09b78b87d
font_02_sfnt_off00011c2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C2F 19812 bytes
SHA-256: a58ea6ecf322e195f68936eef2cb51042b34f62c050937313d72aec76fe97ee8