Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d74759770b9d08c…

MALICIOUS

PDF

82.0 KB Created: 2021-09-09 11:26:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: de0b7074b95708566fb662eb511cd498 SHA-1: a82eeec69d0f2c663d388d739fb27bb95f96298f SHA-256: 2d74759770b9d08c9a245c5cd9feac9b41e93b69282596bfc0bb84ee24ebbb7f
156 Risk Score

Malware Insights

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

The PDF document contains a link farm with numerous external URLs, many 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. The presence of multiple compromised hosts and disposable hosting suggests an attempt to obscure the ultimate destination or evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jeanmarcrobion.fr/userfiles/file/roviwabotuna.pdf In PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/7bb3cf1de749bd0d658bb04239415d06/bazubowex.pdfIn PDF document text
    • https://at-studio.tw/app/webroot/userfiles/files/20210907_135112.pdfIn PDF document text
    • http://hainfelderteich.at/47641396540.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613959e448066---bazazivaka.pdfIn PDF document text
    • https://actor-conseil.com/files/file/jepuvexakeximevaz.pdfIn PDF document text
    • http://antasboru.com/guvennet/resimlerfiles/3316249275.pdfIn PDF document text
    • http://zopos.zohukum.com/ckfinder/userfiles/files/rakijov.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138d04d246f0---gupedelikazewexowi.pdfIn PDF document text
    • http://bernardthevenet.fr/ckfinder/userfiles/files/jutofaxakuwireguwifawatuf.pdfIn PDF document text
    • http://ordineveterinarivenezia.eu/userfiles/files/67574062668.pdfIn PDF document text
    • https://contemporaryteas.in/admin/uploads/file/mikuxijujesirefojovifo.pdfIn PDF document text
    • http://youngthisyear.com/ckfinder/userfiles/files/3134512815.pdfIn PDF document text
    • https://petek.biz/resimler/files/safudoresepawejix.pdfIn PDF document text
    • http://www.hausbaumesse.at/ckfinder/userfiles/files/10100685371.pdfIn PDF document text
    • http://cyklo-sport-servis.cz/UserFiles/File/rewedidolexopikiziwuxexi.pdfIn PDF document text
    • http://foodchemsino.com/d/files/28268549696.pdfIn PDF document text
    • http://holidayservicemarsala.it/userfiles/files/10533505645.pdfIn PDF document text
    • https://luatkhangthai.vn/upload/fck/file/wegolosozenun.pdfIn PDF document text
    • http://kes.org/upload/editor/files/valewonixarafiradoze.pdfIn PDF document text
    • http://kmsenior.org/file/files/senupaxukifo.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130b56f3a617---61060433792.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=biochemistry+books+for+beginners+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_off0000da83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f295.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF295 17796 bytes
SHA-256: 6217e1b68b8e29b69e952f3926573ef75221d63cce155b4e0420fb112e727ce7
font_02_sfnt_off0001204e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1204E 11260 bytes
SHA-256: 6460642f36b9ccc86189fdb6dc42dde6829e3d604fa677f40e8cf2b2e81f98de