Malicious PDF — malware analysis report

Static analysis result for SHA-256 a32eb43c97c0b55c…

MALICIOUS

PDF

90.1 KB Created: 2021-08-09 17:36:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 470f3800ec3dbc30bc9ef202283d78d1 SHA-1: 35430948fee9c5e57721b3ef28e1ad4330ecd517 SHA-256: a32eb43c97c0b55cdd20778081322b2ee6a4a0af28999fe97aa18f02cd0be097
164 Risk Score

Malware Insights

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

The file is a PDF identified by ClamAV as Pdf.Phishing.Trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to potentially compromised websites or disposable hosting. The ML classifier also strongly flagged this PDF as malicious. The presence of numerous external URIs and the 'link farm' heuristic suggest the primary purpose is to redirect users to external, likely malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://zuestag.ch/userfiles/files/58736057328.pdf In PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082812cbf06a---visumokabepusirefekel.pdfIn PDF document text
    • https://implantsdentairesdesmoulins.com/upload/editor/file/36158911668.pdfIn PDF document text
    • http://emke.hu/uploads/ckfinder/userfiles/files/37597617583.pdfIn PDF document text
    • http://usagimatur.com/files/others/xubinobemupifapif.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-7-15/20210715230226236508.pdfIn PDF document text
    • http://newdimension.su/userfiles/file/dazuxetogigesokebo.pdfIn PDF document text
    • https://gtijsr.com/userfiles/file/xupimufiwavujorozune.pdfIn PDF document text
    • http://planbmedia.hu/files/84594927180.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160de301be7154---70089876804.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/bhmkim2i143c85ke5cdp87u6rc/womilokekumujagenida.pdfIn PDF document text
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/932c614971fade83510274c4479b29ef/zimenugavomu.pdfIn PDF document text
    • http://security-m.jp/tool/images/file/98755954639.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/b88ea44dfaa0a4dc682c2caef61a7f4c/pagakobekakagaziv.pdfIn PDF document text
    • https://sahodayabbsr.com/test/fckeditor/file/59248709570.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16078df795b3f7---84661294327.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/9b04a181209ceadd78681f00bf63ed3b/98682880141.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099f96ec8c37---figipaluroros.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/lerosutikivos.pdfIn PDF document text
    • https://12shio3.com/contents//files/76722354560.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/535e2776fe41aa3636774fb91c9a8a32/fomezopezixat.pdfIn PDF document text
    • https://yellowstonewildlife.com/27920501647.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=assetto+corsa+all+free+cars+modPDF 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_off0000fa5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001126e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1126E 18232 bytes
SHA-256: b8902881f9e79ae5712fb5789bbf7b202601b5690c5aba5b3d091fac5d85b719
font_02_sfnt_off000141c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141C2 10424 bytes
SHA-256: 5c77bc0532e2ad252869c56cb03deacfd11ecc4c8bbe79e9b4fd8887d83e33ac

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