Malicious PDF — malware analysis report

Static analysis result for SHA-256 87a0ed5b69ff5f3b…

MALICIOUS

PDF

87.7 KB Created: 2021-07-08 04:29:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 43747e72e074c25f77314892d0d524b6 SHA-1: 9f7ce81b5355695ff486f6bc82e8dd901cb37422 SHA-256: 87a0ed5b69ff5f3b7252b894f67ea013509311515b05ea201f5f5519bb3f43fa
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to various URLs, many of which are hosted on compromised CMS upload directories. This suggests an attempt to lure users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/7a949cc38e7278b74b6be93fe87dced2/joxibekitikikip.pdf In PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a4556dbf8---tefugubovataxujena.pdfIn PDF document text
    • http://vasvaripalmuzeum.hu/upload/file/boxedawutaligaxak.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b0acb7be5---dugadunomizunatirekukeg.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160c474fb1825d---84213922207.pdfIn PDF document text
    • https://frontlinetherapist.com/wp-content/plugins/super-forms/uploads/php/files/e48c26abd57ef8602c39f8c3de96e5db/rugugekifope.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/54744752995.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16078afcda1c8e---zenajitarejadapo.pdfIn PDF document text
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/201cefd7966562e054f169cb0fbc6ca3/xefosikugaf.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/402dedac4dd1a9819526f796ca862adf/14825250320.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/26p2q0kujtobh35s9qu7fvtfet/64528499119.pdfIn PDF document text
    • http://geoplan.su/userfiles/file/21276697512.pdfIn PDF document text
    • http://cnzhongkui.com/fckeditor/editor/filemanager/connectors/php/uploads/file/030733309247.pdfIn PDF document text
    • https://ev-owners.jp/userfiles//files/tomefazatutofetigubizuw.pdfIn PDF document text
    • http://ristoranteibucanieri.it/userfiles/files/lesodotokuvaxuruxemibedu.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/gedupixidezusijarodi.pdfIn PDF document text
    • http://greenplanetnepal.com/userfiles/file/pudujavutapur.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/2d35574c8c3499d08ea9d9962c99bd43/zozowizixufebefep.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/72cde16207b099567b96058ad4ad5bd8/gavukusetusazavemen.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/23559958897.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/a1425e4cf97034f5743213813b533196/kazamag.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/1but3pkq24338gja1j0dcqc795/73139047598.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/0b5e3a3deb237f945495e52949d44fa8/sobifovepugakosi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=maine+coon+kittens+russiaPDF 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_off0000ed1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED1D 21288 bytes
SHA-256: cb88aa8485398ebf891e667215dcfa7d4bee441414ba1d52867733e4e469ceb8
font_01_sfnt_off000121d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000139ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139EE 10364 bytes
SHA-256: 20af30e768c617bd946bcffd6ba5dd5dd1112bbb85c2b4987bd10f9d957e29d5

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