Malicious PDF — malware analysis report

Static analysis result for SHA-256 97c1815120ec6e69…

MALICIOUS

PDF

73.2 KB Created: 2021-09-18 08:29:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3832ed8eab409f4e4016100c93fe271c SHA-1: 028124c852c3f0242a2a4b6c7d15257924f0c331 SHA-256: 97c1815120ec6e697c8f899b0e8bac2d6477bdb092ea0a99efbfe4a0b508bdc2
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to compromised or disposable hosting, indicating a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure and URL heuristics are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://crysiq.ru/uplcv?utm_term=complementary+symmetry+class+b+push+pull+amplifier PDF link annotation
    • http://elskenecologie.nl/files/fanixud.pdfIn PDF document text
    • http://peak-experience-japan.com/images/blog/file/63601555505.pdfIn PDF document text
    • https://brihat-group.com/assets/userfiles/files/32508058093.pdfIn PDF document text
    • http://trineckevzdelavani.cz/webpagebuilder/ckfinder/userfiles/files/jidibafuxosejiwanakufar.pdfIn PDF document text
    • https://shindah.com/images/ckeditor_img/files/99243613087.pdfIn PDF document text
    • http://anm-av.de/uploads/files/kexujaloputas.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/4e5d24b30a54d51e61a88b56e50710bc/10986126345.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139d2098038a---wixofazenuzesomanitu.pdfIn PDF document text
    • https://serrechevalier-skifun.com/imagesfile/nabojukoralotafavo.pdfIn PDF document text
    • https://etevent.itweald.com/uploads/files/613f15aa7137e.pdfIn PDF document text
    • http://topp.pl/_topp/file/38792610088.pdfIn PDF document text
    • http://www.siposferenc.hu/html/38242378416.pdfIn PDF document text
    • https://mchs.kz/userfiles/File/99280107244.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/s9ca7v506t4t03g63ibshvhiqt/lukafitovevaru.pdfIn PDF document text
    • http://nm-union.ru/ckfinder/userfiles/files/wokiv.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/b345fe90d9057110d61c6df52cd51f57/vediki.pdfIn PDF document text
    • https://ambalatender.com/upload/files/fijedakalorulokos.pdfIn PDF document text
    • http://srs-budapest.hu/uploads/files/35008525995.pdfIn PDF document text
    • http://candleelectricals.com/uploaded_files/userfiles/files/tasovefejabozefivirupipo.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1613983c66ad2a---80443845256.pdfIn PDF document text
    • http://canoto.us/Images_upload/files/pigimuduzes.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/689df9c2efec201d990ad88460995dc6/xigekuwexuzof.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/14943233042.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/buxalonamarexejisutore.pdfIn PDF document text
    • 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_off0000bb21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB21 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d338.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD338 11132 bytes
SHA-256: 249682f3162fad2123ebe2220fd86420633f79fb90797fe6fe6c2a21b7421562
font_02_sfnt_off0000ecca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECCA 16256 bytes
SHA-256: 2f440c8f331cb9346a2da16184c8c10955c372f7c3890da957dd4765cb9f043f

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