Malicious PDF — malware analysis report

Static analysis result for SHA-256 952510d596839be2…

MALICIOUS

PDF

91.2 KB Created: 2021-08-07 15:30:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d0b9bb8214c1c7b575474eb3efb78aec SHA-1: de199b0ad404ac9d411a40f58b7eaae7f7aca979 SHA-256: 952510d596839be28f63c4c0ce7b612ada7a1e4e94f42ecff11231249d69c4c9
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting domains, forming a link farm. This suggests the primary purpose is to redirect users to potentially harmful content, likely phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://drafthe.ru/uplcv?utm_term=melhor+livro+de+direito+tribut%C3%A1rio+para+receita+federal PDF link annotation
    • http://stepsforstarlight.com/clients/c/c6/c668404594a1c08d975ab50c7bec58f6/File/jutisifugazuketawalakek.pdfIn PDF document text
    • http://kxzyjy.com/CKEdit/upload/files/2851924752.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/nnm7v3llcju79l4t3hsncnmjfh/80292294002.pdfIn PDF document text
    • https://scanclean.bg/upload/ckfinder/files/lowojeratiridewixiwevibuf.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/383a26b84665db5d6f1404b503ed2d45/38779648383.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608a6ad802e32---jewenaravexadafoxaxaxerej.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/53ab56f21b24599c6ba3b63943a489df/bimavumivefurigakikim.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/53a626c43b1d518c787e4c429731c1df/8335273035.pdfIn PDF document text
    • https://hanahana.vn/media/ftp/file/4510681868.pdfIn PDF document text
    • https://newtop-eg.com/userfiles/file/jolopetonidawaje.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/9ac17b3b802e6e10a4e28f4fb703b41c/11475502601.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b2c75e0b6---rosewigafunutobopoti.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/m4gbnba18kuhl580iomnq8cjq3/77383021468.pdfIn PDF document text
    • http://turexpert.md/userfiles/images/file/63370964034.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/ei49e68a2r4kpde6ghjaj7gstb/89012784933.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/7b64262faa4958b14b59da399f72ffd0/nakimuvaramininazikaje.pdfIn PDF document text
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077fac3192af---31851106808.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a05a575577f---92848293520.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160be99d3aa6f9---28243460109.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/sr7nm8597p9pgd60k21p9rsu4m/sifonuduwub.pdfIn PDF document text
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/f804e87567c5c0efb84d143ff547a7c9/37523093350.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092405a684d6---pufulu.pdfIn PDF document text
    • http://boathousebrokerage.com/userfiles/file/37525809392.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_off0000fb09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB09 10924 bytes
SHA-256: 4e650477b933233ba439cb1438f1dc85a960b2f97dc107df9c5ab97e23c2e59a
font_01_sfnt_off000113da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012bec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BEC 19068 bytes
SHA-256: 6cd9f3ae6e6004058bf312e2c7bda18f047e195c00fb631b5b137b740a806f71

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