Malicious PDF — malware analysis report

Static analysis result for SHA-256 caaba5f888c7641a…

MALICIOUS

PDF

90.9 KB Created: 2021-09-06 12:21:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: be8d87f0909cf33095c6b338acc549bf SHA-1: b263646c70b03716e19abb3c59198fc85257ed08 SHA-256: caaba5f888c7641aa3292e2d66994ec7e947785c4858810b5131cf858c2cc660
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs, several of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure suggests a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://inarchengineering.it/userfiles/files/8428393337.pdf In PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096b78adab82---40554133398.pdfIn PDF document text
    • http://interiorconsignments.com/media/file/52507891308.pdfIn PDF document text
    • http://ptaki.info/imgekoprojekty/files/nixaguzejiriwasokikiluto.pdfIn PDF document text
    • http://anhhieu.vn/hinhanh/file/xuvisinuzatopaxi.pdfIn PDF document text
    • http://dyglas.com/userData/board/file/17562411106.pdfIn PDF document text
    • http://dietaltop.com/userfiles/files/jidigunogenelosabirufigi.pdfIn PDF document text
    • https://arnetbilgisayar.com/upload/ckfinder/files/81479811909.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075896933601---99897170922.pdfIn PDF document text
    • http://ecofincas.net/ckfinder/userfiles/files/junuratubo.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0cbea01912---31842419069.pdfIn PDF document text
    • https://www.kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/tizifowobivin.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac493fbe6ec---94472432841.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/89630818901.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/f46910a60f469486e9d9d71135ea1fa2/64845902970.pdfIn PDF document text
    • http://abaj.cz/UserFiles/File/99782278932.pdfIn PDF document text
    • http://enjoy.sk/editor_uploads/system/files/jutimexet.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/userfiles/file/70872248963.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/794be3c72ce8719040dfdba3c0516e68/96492427675.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607147c4a270d---59518245959.pdfIn PDF document text
    • http://bundoreh.com/fckeditor/files/file/gomalalofumetevidesixeg.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/zevexuwuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=quartiles+percentiles+deciles+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_off0000fda6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA6 10652 bytes
SHA-256: 0936a74bd95c4cd4c3a9a375e6c6c0280e102b0e8385fc1bbbc4f0f7d94bf063
font_01_sfnt_off00011635.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11635 17976 bytes
SHA-256: 144d3678831d71062f7072e6e6e6524dc132a28422e60a697d81ec69cbb8b0ff
font_02_sfnt_off0001458c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1458C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.