Malicious PDF — malware analysis report

Static analysis result for SHA-256 86cdb4c5d353aa4a…

MALICIOUS

PDF

80.0 KB Created: 2021-09-07 05:51:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: be5eeef2f07b809096d4b1ae2ee81d87 SHA-1: ef26d1bda24044f1ebfce1cc956b114bac3488b6 SHA-256: 86cdb4c5d353aa4a4ba16369e1289500af1fdb0de2e3df0db49617abc575d259
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and links to compromised CMS uploads, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the PDF structure itself is used to host and distribute malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://archism.ru/uplcv?utm_term=structure+of+atom+class+10+pdf PDF link annotation
    • https://europacreativaeuskadi.eu/files/galeria/files/46309058005.pdfIn PDF document text
    • https://tonwen.org/userfiles/file/zulatatososatogasevo.pdfIn PDF document text
    • http://ehs1958.org/clients/73155/File/49381059756.pdfIn PDF document text
    • http://geyikkimya.com/userfiles/upload/file/21131223556.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/f28fc4f07a3364246bc9c27ff0541d15/kimupagagupidodawizelija.pdfIn PDF document text
    • http://tkhomedeco.com/assets/uploads/ckedit/files/20210609135123.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/zosalorufuwovuzuxojep.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/kijanatewoweve.pdfIn PDF document text
    • https://kungfuclasshongkong.com/louis/taichi/ckfinder/userfiles/files/67352621513.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/770e09660b7ef7a2c3b5e0dc0d4e3f81/begarabagosimivuxijul.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608871fcc8116---losisal.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/gmp8i6a5uvrpgj0s1pl4ujvuo2/bifukekuma.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cfb04527ab---66001981263.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/0fcf66ac7bea890b0e8cbdfcbd378e89/36537841526.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210810135717.pdfIn PDF document text
    • https://euroroma-bg.org/files/file/juludawo.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/8d3eln4q7crj9ja85vl2o1nju0/48498161233.pdfIn PDF document text
    • http://e-kva.ru/admin/ckfinder/userfiles/files/40163988678.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc8eb2b7cc---80884481899.pdfIn PDF document text
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080220460dc8---vebexodukodukapog.pdfIn PDF document text
    • http://szkolka-wiercioch.pl/files/file/22741511072.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612732c262e0b---nodovozebosarosi.pdfIn PDF document text
    • http://parkhighclassof60.com/clients/871169/File/58819296842.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_off0000d03a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD03A 18520 bytes
SHA-256: 4e128384389098aeaf9ccac1aaed654f44e77c4074fd66f4d7dc7d4a31f84a26
font_01_sfnt_off000100c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C7 10936 bytes
SHA-256: 09ced3bf484ab5c99515fc8fab30a1138dbc56ca4bf4b50b244f050bc2fd3520
font_02_sfnt_off00011a37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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