Malicious PDF — malware analysis report

Static analysis result for SHA-256 a88cd348d21f843c…

MALICIOUS

PDF

82.2 KB Created: 2021-09-01 17:51:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3ff8601db4e3357c7adf7e3b842fe6be SHA-1: 41dd58c84203ca58ed175bb41afe77e328c05931 SHA-256: a88cd348d21f843c9736f4160f33076a3396ceac4459c7ab462c92c20b3ccc8c
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm, with many URLs pointing to compromised WordPress sites. The ML classifier and ClamAV also identified it as malicious, specifically a phishing trojan. The document's structure and numerous links suggest an attempt to lure users to malicious external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160d78dd98cb07---lulekelevalonavagepexefow.pdf In PDF document text
    • http://yeditepegumruk.com/userfiles/xojari.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/f378473ed9b09900a4fbdd7017a10944/xikuzadipumavov.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160f4c41caee06---19054109192.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a05d30100ab---16876056290.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609be2980938c---baxikuligubi.pdfIn PDF document text
    • https://oxi-dental.ro/imagini_ws/raberixuwiloxozagaki.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/16074fc5403602---nimexejamadezugovitege.pdfIn PDF document text
    • http://www.golfusa.be/userfiles/files/93889876919.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/itc0fkjt1t0g2d5vp3ost93tp3/10659590139.pdfIn PDF document text
    • https://tenfci.org/userfiles/file/48361054255.pdfIn PDF document text
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/92332123687.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/16090aa382a94b---7258490169.pdfIn PDF document text
    • https://bomberosdenavarra.com/userfiles_nexo/files/58150626380.pdfIn PDF document text
    • http://stensoproject.com/userfiles/files/58141224317.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/masovi.pdfIn PDF document text
    • https://jasz-pap.hu/UserFiles/file/rafuweterixadoteb.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/61e2956a312bc6fee84eeaca421fae06/natedulazinataru.pdfIn PDF document text
    • https://trade.inter-ural.ru/ckfinder/userfiles/files/54011980653.pdfIn PDF document text
    • http://coolbiotech.com/upload/files/78789234857.pdfIn PDF document text
    • https://clubforeducation.com/FCKeditor/userfiles/file/58918569557.pdfIn PDF document text
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/4d771f9e7f7c70df492f9bd816152170/40686559935.pdfIn PDF document text
    • http://tuhs1970.com/clients/a/ac/acc339db084e87cdfae31a76a6c96f1c/File/37397782863.pdfIn PDF document text
    • http://ohmamakitchen.com/uploads/files/61325377350.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=minestrone+soup+with+pestoPDF 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_off0000dce5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE5 10320 bytes
SHA-256: 3492546fcbf4c5dfccad3939b9e8bc69abe6e4f18b35e1b5573a04144e6aadc8
font_01_sfnt_off0000f42d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF42D 17812 bytes
SHA-256: 6a6c7939941c0efa33e38fc3458af08e35b2550e0619db4de7a54812bc2942a9
font_02_sfnt_off0001226b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1226B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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