Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9fdcdab06c3445b…

MALICIOUS

PDF

86.1 KB Created: 2021-07-17 05:17:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e0626c81bfbd83023cd8d5c2274ace81 SHA-1: 8e0658cf333fa577f84e581f2248741af48f3d17 SHA-256: b9fdcdab06c3445b33c6a271019f7346a9db75d8036a38e7ef133276f341f377
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload directories, suggesting an attempt to redirect users to malicious content or phishing sites. The presence of multiple distinct hosts and the use of 'utm_term' parameters further support the link farm and potential phishing lure.

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://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/49db41932bed8557c6b0c9c5fc9a7711/pajivaf.pdf In PDF document text
    • http://refinerlink.com/userfiles/file/95979010414.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d746c11db95---79922877740.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8315713c8---53674956654.pdfIn PDF document text
    • http://euroteam.vn/ckfinder/userfiles//files/15486389557.pdfIn PDF document text
    • http://senn60reunion.com/clients/876260/File/6391673603.pdfIn PDF document text
    • http://thementalhealthadvocates.org/files/userfiles/file/kofiromokinegulalar.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/094477d2f444c5e5f5f785985081ab46/rubag.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/b152afd20df3067a3a7dca6806fb4c92/57245968277.pdfIn PDF document text
    • http://componentcnc.hu/uploads/ckfinder/userfiles/files/27145481866.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b3fdf13f2bc---toxag.pdfIn PDF document text
    • https://beatmuellerfoto.ch/userfiles/files/36224267218.pdfIn PDF document text
    • https://alteanetworks.fr/img/file/peduvikebanavinulesom.pdfIn PDF document text
    • https://samtee.com/admin/images/file/80755778900.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/b4d528777139d3ded3b96df7303d10f4/tijepinariranu.pdfIn PDF document text
    • http://creptiles.dk/userfiles/file/kepirakilezaf.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/n570r98djtaadf2nq2ugmvbud3/vuwowasewes.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609f47877955e---geloluvepepudopimomaw.pdfIn PDF document text
    • http://10glazsikeyrosa.ru/file/kevomubuni.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9c9ea9b1e---liletija.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/lg7ilvfmemm7shim425hlep402/2401505432.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/52321bf9ea9ed554dda440accf378a0d/xezul.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/e2fdd524e33e4a2949ee0cffab6f685d/25317875227.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=dm+and+collector+are+samePDF 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_off0000eb70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB70 10440 bytes
SHA-256: 21a1987b6286398e9491c2c4f69fdab1848a3174a0d2fae8a48b70c6f46dda87
font_01_sfnt_off00010319.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10319 18112 bytes
SHA-256: a2ba554e53c085aec79141083caccdf68b37b991810ff073f4132948db609552
font_02_sfnt_off000131cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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