Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ce25d19ad9c7bf4…

MALICIOUS

PDF

74.8 KB Created: 2021-10-03 09:06:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: cb5f94dfc4992312ecc4d30d070805b5 SHA-1: 6177bb20219a5c045211764ee06e78fe65c3906e SHA-256: 4ce25d19ad9c7bf49793b5d9fa92f2d825c8a6a29f56e6e2b17c7c6187c5e8a4
156 Risk Score

Malware Insights

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

The PDF was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress sites. The document body is unreadable, but the presence of numerous links to potentially malicious content suggests an attempt to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef2072b64c---wasirudotosen.pdf In PDF document text
    • https://ikima.fr/uploads/file/tazimegutunazoferisav.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16139f02a09fe0---xedefaxodepipupewi.pdfIn PDF document text
    • http://halaljones.com/uploads/files/soweda.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/ditaratudexofujanesatow.pdfIn PDF document text
    • https://debcopharma.com/userfiles/file/pajiz.pdfIn PDF document text
    • http://zakuskymoser.cz/www/ckfinder/userfiles/files/32248868696.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16130d9c2df110---59252755545.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614907bf4f651---magumese.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/e2761fdc9ac4f5967098f64b9961d9b0/88325247116.pdfIn PDF document text
    • http://retrievers.su/ckfinder/userfiles/files/48128434966.pdfIn PDF document text
    • http://kyanite.tv/userfiles/file/luwanejumiru.pdfIn PDF document text
    • https://bouveau-consulting.com/userfiles/file/14652220843.pdfIn PDF document text
    • http://generale-bureautique.fr/gdb/files/file/59312173313.pdfIn PDF document text
    • http://dienhoabacninh.vn/webroot/img/files/40316122975.pdfIn PDF document text
    • https://balbok.net/admin/ckfinder/userfiles/files/30513251061.pdfIn PDF document text
    • http://magiepourenfants.com/images/mediamanager/file/7254860931.pdfIn PDF document text
    • http://greenld.com/userfiles/10605353603.pdfIn PDF document text
    • https://priscar.com/documents/files/xosil.pdfIn PDF document text
    • http://gr-chem.com/upload/files/dorapajof.pdfIn PDF document text
    • http://enovosti.info/ckfinder/userfiles/files/vusazukuxasafasatebowo.pdfIn PDF document text
    • http://dreamwith.gni.kr/ckupload/files/fisujapizoxupukako.pdfIn PDF document text
    • http://icsbc.ru/fuploader/file/jakugixujuvefuxujizuzav.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1614c06e0724ad---luxeje.pdfIn PDF document text
    • http://keletunderground.hu/images/uploaded_pics/file/jebinakuruwupekalaran.pdfIn PDF document text
    • http://agrostroi-proekt.ru/ckfinder/userfiles/files/dunixefosuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=mnemonic+meaning+in+teluguPDF 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_off0000bb86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d398.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD398 19356 bytes
SHA-256: 220f1ae2bebfa9a3c07f536e5b5c46c30883014303079d3b8a0ed33ccec83fdc
font_02_sfnt_off000105e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E1 10400 bytes
SHA-256: 86e1b804931b0c375d982c4f897b82748931bdfeff294bf813c47c500958be2a