Malicious PDF — malware analysis report

Static analysis result for SHA-256 b18c3ecf43c760d5…

MALICIOUS

PDF

82.7 KB Created: 2021-09-02 21:22:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 929cbf5010ceb56d1beec7c1326d73cf SHA-1: fb7a9c89ce780e00d76beeefa497a49752b506d6 SHA-256: b18c3ecf43c760d5192408f35ff3e4cae687f72a784d2648c2bbb036f443810b
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a link farm pointing to multiple compromised WordPress sites, likely intended to trick users into downloading further malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a deliberate effort to obscure the true destination of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/vdil1e0rf6lac5kd217ukvg8sp/dekipinerelip.pdf In PDF document text
    • http://gomientrung.vn/uploads/image/files/madixiwikobu.pdfIn PDF document text
    • https://www.epicbrands.co/wp-content/plugins/super-forms/uploads/php/files/86dc61e6c70e0a85199434a0cc37cb1e/15613890319.pdfIn PDF document text
    • http://mesahighclassof63.com/clients/79820/File/fimubukosegikiliw.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/cbe7dd2r0tecjbhv1gja9qb6q0/82100868587.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/77326406915.pdfIn PDF document text
    • http://upservice.expert/admin/ckfinder/userfiles/files/vurejanedejozinolofinozi.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/d2be346e3bdb0dbb5d98d8991c8657b9/gugadamimopanemepukugul.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d19d5d0cf22---ginasewuboxikukewovosij.pdfIn PDF document text
    • https://mimpishio2bet.com/contents//files/kowabode.pdfIn PDF document text
    • https://kogan-photo.ru/wp-content/plugins/super-forms/uploads/php/files/fe475180c0f5c11a2ea609a30f7e60fc/muvapunoxujatow.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c878938bff---nodututoxajagajalo.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/16090f91f26709---bikafetiboroberige.pdfIn PDF document text
    • http://josephlillianmorrisfamily.com/clients/59960/File/54457180954.pdfIn PDF document text
    • https://agmatbaa.com/upload/files/vusuzidanotedov.pdfIn PDF document text
    • https://gulceoyunlar.com/calisma2/files/uploads/noloriripokujedo.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee3b5eac757---novebejosujazagomamatigud.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088f44c6a84f---baxafanexiv.pdfIn PDF document text
    • http://beijinghuojia.cn/userfiles/file/29201897247.pdfIn PDF document text
    • https://www.vignolaweb.it/ckfinder/userfiles/files/kewuvawanegagab.pdfIn PDF document text
    • http://textingrights.com/userfiles/files/borenaduputepami.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/50e90be57fc8a6bfbf40c2717be593c4/57258774199.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=curriculum+vitae+pdf+da+compilare+e+scaricarePDF 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_off0000ddf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f60e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF60E 10876 bytes
SHA-256: e23b87ed152cb232be8a3e6dabcc8fc9f5ec662357a6af0d520a92f2a15b8185
font_02_sfnt_off00010f40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F40 17444 bytes
SHA-256: e08dcec0ff78ff09832e6f2320e18fa4d31386efc204a5b5d55e01f4edf3731f

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