Malicious PDF — malware analysis report

Static analysis result for SHA-256 124d0ea9b8ea5cf1…

MALICIOUS

PDF

84.2 KB Created: 2021-08-19 23:09:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: a42e636f8c0268a5a5b100ae2518ae0e SHA-1: 11e47affc4dfda4845e19a101691ce07a072a3c4 SHA-256: 124d0ea9b8ea5cf17d9bec66fe487c4906570fcf908a9a2722dc68ed3648906e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS upload directories, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely involving the exploitation of vulnerabilities or phishing lures through these linked sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 https://olivierdaulte.com/ckfinder/userfiles/files/guxobotowajisut.pdf In PDF document text
    • https://marmarases.com/upload/ckfinder/files/79773475780.pdfIn PDF document text
    • http://porpora.biz/imagenes/imagenes_contenidos///25107526632.pdfIn PDF document text
    • https://www.moxiclear.com.au/application/third_party/ckfinder/userfiles/files/didonizefezixapokama.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af955cf1262---jegijekumokilosebofuw.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/46044028085.pdfIn PDF document text
    • https://implant-drill.com/userfiles/file/lawalekutusijuru.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a554057ffe2---dugukixudisitajip.pdfIn PDF document text
    • https://ehotelgateway.com/bot/ckfinder/uf/files/lafixepimokajem.pdfIn PDF document text
    • http://hongdacable.com/d/files/13112725551.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160aa25938bed8---77104477540.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a647927ca4e---lovedewuzumowomavibop.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfc8b4520e7---bizesosodixevutos.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/rl658h4db9v948su63pr6sg053/koremixisu.pdfIn PDF document text
    • http://tungalag.mn/userfiles/files/95030479235.pdfIn PDF document text
    • http://bethelcommunityone.com/clients/880032/File/32938043493.pdfIn PDF document text
    • https://eitmedu.in/ckfinder/userfiles/files/vafaxobemowibugoxowito.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/9b05be4ab633842e4104e97f5437dd61/lorela.pdfIn PDF document text
    • http://teckim.it/themes/userfiles//files/zodunurunuxelelenifoxu.pdfIn PDF document text
    • https://wecareu.net/ckfinder/userfiles/files/62844324614.pdfIn PDF document text
    • http://robbinsfamilyhealthcare.com/clients/2/2c/2c787fa606fc56c3a3a24dfc5409695f/File/kemefemuxaratalizopo.pdfIn PDF document text
    • http://omak1968.com/clients/71178/File/zosirazomuseguwutigeror.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/gubarusolu.pdfIn PDF document text
    • http://accronline.com/userfiles/file/32083252678.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/82388574106.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=manualidades+con+material+reciclable+para+ni%C3%B1os+paso+a+pasoPDF 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_off0000e138.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE138 17796 bytes
SHA-256: e2ff6e357d18f1b6ffa01afd7b603bce136b4ee132ea008948d1fe8d57f220a2
font_01_sfnt_off00010dfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012611.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12611 11112 bytes
SHA-256: c4f5418d025c65e41868db9edad9a322d9a52efcc930b3065082e500ac9d3786