Malicious PDF — malware analysis report

Static analysis result for SHA-256 3799376c5131e6ec…

MALICIOUS

PDF

136.4 KB Created: 2021-06-27 02:24:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3b1ed4e75f5b65061f4469595f95b594 SHA-1: 85bd1d6ff51db15567c540891b0d1c671053369b SHA-256: 3799376c5131e6ece5eac9ae0a69f43eb0f46b1e5787f68464f7093c88acea30
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9921

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 http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c885f7c1640---9828998654.pdf
    • http://wjvanderheidedienstverlening.nl/uploads/file/59257355699.pdf
    • http://korean-school.hu/hangul/userfiles/file/mekoxusejugutuvego.pdf
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/5d5bggbdrtfd8km16ern7m6dd6/wiverapakejaruxepesire.pdf
    • http://eau-msu.ru/ckfinder/userfiles/files/56614833366.pdf
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/4m7o1dm7o1t9e064jfru8q1675/dikiru.pdf
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160704c3aca956---nuxozilegafuro.pdf
    • http://lafenicealcamo.it/userfiles/files/26847596003.pdf
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/m30dh6auiqnp4kb6fbat073nfi/wukukunizatax.pdf
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1608add7c02039---51987082475.pdf
    • http://aarogyamedico.com/userfiles/file/numisineboxomoxoxedupetag.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16072c0ad8f6cf---82952772851.pdf
    • https://allcreaturesinc.com/files/files/28749556028.pdf
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/a1a2eaef2bde0c85f94f98c9075d2414/xixopuxotexifilogezedite.pdf
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/044ea9f9947130b9af1ba1474875bfc1/63885956773.pdf
    • https://n-zvuk.ru/upload/file/divinesa.pdf
    • http://alexanderkanevskyartgallery.com/clientMedia/file/kufidoturesi.pdf
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071be08a20a6---botivuradit.pdf
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609560b04e0e2---zuwugitigizofi.pdf
    • http://specimport.by/files/files/vopowadapesubuwefugujej.pdf
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16098456a41681---wufinebelenikivej.pdf
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/cec71b84a7ca2b9e750e201e186f1dbd/sejurovojad.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=gta+3+android+version
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001b559.bin
bd11319beb72fe6f6449fe795ef96d40aaa8dd9880421380a42f88787ceee2ae
pdf-font-stream PDF embedded font (sfnt) at offset 0x1B559 10472 bytes
font_01_sfnt_off0001cd5d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1CD5D 16792 bytes
font_02_sfnt_off0001e56f.bin
622eb7e30a053eabb055c06d08973d6c00a4015d129de76d9ec0ac3416373085
pdf-font-stream PDF embedded font (sfnt) at offset 0x1E56F 17712 bytes