Malicious PDF — malware analysis report

Static analysis result for SHA-256 88b2ef6dca8206a2…

MALICIOUS

PDF

84.4 KB Created: 2021-08-19 18:32:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ac730893eb1dea0ecc2a6855ca7a6464 SHA-1: b1b6d4f44d75e6513eb19e191f45cb1d3b48a624 SHA-256: 88b2ef6dca8206a23e903801dcb19e0c49e07670e475ff5ac561cf7a56cc29cb
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting. The primary purpose appears to be directing users to potentially malicious or phishing content, consistent with a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 http://caramelitos.sk/files/xuvizoxowubenudefodivudo.pdf In PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/3a10b2b66a536396ab676511318ad58d/67437217467.pdfIn PDF document text
    • https://lazerom.pro/media/file/lugasotejelagofila.pdfIn PDF document text
    • http://hoanggiaphatland.com/uploads/image/files/10867494899.pdfIn PDF document text
    • http://musicpark-live.de/userfiles/file/boxogunufu.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/463572ebe64ab04c62002a5d58b6700d/lekotuvusozogirogexe.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e060c8d1608---30626943172.pdfIn PDF document text
    • https://guijek.com/userfiles/file/96401557920.pdfIn PDF document text
    • http://crimesla.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/50774821575.pdfIn PDF document text
    • http://joyear.com/ckfinder/userfiles/files/82277876357.pdfIn PDF document text
    • http://blbr365.com/userfiles/file/1625145330.pdfIn PDF document text
    • http://nppmaudaha.in/ckfinder/userfiles/files/tamobewesizut.pdfIn PDF document text
    • https://perfecthospital.org/FCKeditor/file/13401755463.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072f925b1e1f---vokuderudafepakelasixip.pdfIn PDF document text
    • http://ahsaipu.com/v15/Upload/file/20214291646181560.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/68f2e1490987f77f4afa0a8088972988/75774988064.pdfIn PDF document text
    • http://temple.mo/userfiles/file/dejatupulitaxodowukuzena.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210805033008.pdfIn PDF document text
    • http://www.pethouse.es/ckfinder/userfiles/files/katazufujus.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/404f7fa28080948b531ec887775a1726/rabobujopipufipafemukok.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c54cb4df545---96787044031.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=government+budget+analyst+interview+questions+and+answersPDF 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_off0000e592.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE592 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fda4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA4 16800 bytes
SHA-256: c72d92bfe02a128d9535e43a0c0d8d489f850926b167def9f59ec0a8edefb570
font_02_sfnt_off0001291b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1291B 11280 bytes
SHA-256: 8bdb6b2dab6c8f1df56534a2098a846236f2c222a959a3344a46c0e11987b351

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