Malicious PDF — malware analysis report

Static analysis result for SHA-256 238b5619266d41fe…

MALICIOUS

PDF

81.8 KB Created: 2021-09-03 22:02:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 475f13dc435b032f08c8cd5058a0eeb6 SHA-1: 8d9ff0d4bcd7f03468a62e1d5e965bae79a0321e SHA-256: 238b5619266d41fe95620eb250db5a96a9e4a091f5f12eb3d1a3f9f031711b0a
156 Risk Score

Malware Insights

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

The file is a PDF identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which point to domains that appear to be compromised or disposable, suggesting a link farm designed to redirect users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of multiple unknown URLs strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://omonetach.pl/foto/ilustracje/file/21480666027.pdf In PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160878a8b412f2---88894464780.pdfIn PDF document text
    • https://smsenerji.com/resimler/files/98130823881.pdfIn PDF document text
    • http://gldbirdgel.com/user_img/files/34863853265.pdfIn PDF document text
    • https://artenika.pl/fck/file/9080748271.pdfIn PDF document text
    • http://princeverma.in/uploads/files/nunuzagonuvajuf.pdfIn PDF document text
    • http://thangmayedex.com/webroot/img/files/19542542107.pdfIn PDF document text
    • http://chinazzjx.com/d/files/82600761402.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607b7345ad079---pomugeris.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a7072c28539---vipinoxidizirukakapetow.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/kikorapulutavexor.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/183349dbe150ccaed7fb630514e1e6de/72858433815.pdfIn PDF document text
    • http://jcnjl.com/userfiles/files/6962225051.pdfIn PDF document text
    • http://palazzodiaz.com/userfiles/files/tananagid.pdfIn PDF document text
    • http://qlinairnv.be/userfiles/file/roxagu.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/gci0rodplj20st0kfps2j36djt/kuvemit.pdfIn PDF document text
    • https://art-eria.pl/mandarynka/pliki/files/27411083218.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/vubalumivalarizez.pdfIn PDF document text
    • https://istanbulbalbir.com/upload/ckfinder/files/kipelefuvigiwixiv.pdfIn PDF document text
    • http://cyklo-sport-servis.cz/UserFiles/File/68965433128.pdfIn PDF document text
    • https://dailyiat.com/html_upload/file/xuzaka.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c7002edb3f---32759565379.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=choral+music+notes+pdfPDF 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_off0000d85f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD85F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f076.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF076 11016 bytes
SHA-256: ee025e0b4ff6914b7527ee7d9e0b6a7309d19a182ca3421e8ed67e20c37d088e
font_02_sfnt_off000109e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E6 18792 bytes
SHA-256: 2c4c9cdbe0ef2989c6ad49770085561ef6271e2657c77651e9411017925a582a