Malicious PDF — malware analysis report

Static analysis result for SHA-256 d37e799ca5493a44…

MALICIOUS

PDF

78.8 KB Created: 2021-09-17 09:07:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0fdedf0972f297624f1c6e3fea8e074f SHA-1: c89836c87c960d65921c1c1410baf6d7f99c09b6 SHA-256: d37e799ca5493a4485bb7d9e3f9b0d6a7ea6696dd64b3c3ea17fe4007839da23
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness with high probability. The presence of embedded JavaScript and a large number of external links, many pointing to compromised CMS uploads or disposable hosting, strongly suggests a phishing or malware distribution attempt. The document body is heavily obfuscated and unreadable, providing no further context.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138f19cb0a5c---pakituvomorujila.pdf In PDF document text
    • https://acconpriti.com/ckfinder/userfiles/files/16743101266.pdfIn PDF document text
    • https://kovrdom.ru/sites/all/sites/default/files/file/watidulisaserar.pdfIn PDF document text
    • http://imhyuk.com/imhyukeditor/userfile/file/50889607892.pdfIn PDF document text
    • http://esangsok.com/upfile/files/padewoladuwunima.pdfIn PDF document text
    • http://cetis156.neutronds.com/assets/js/ckfinder/userfiles/files/65578639676.pdfIn PDF document text
    • http://ozgu-yapi.com/firma/files/25861277892.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/dd4506a7f3e05061d7e91daa6a53d739/53221583817.pdfIn PDF document text
    • http://kimwendelldesign.com/ckfinder/userfiles/files/27878837548.pdfIn PDF document text
    • http://gavionescodeinsa.com/userfiles/22046578381.pdfIn PDF document text
    • https://www.newhorizonscrisiscenter.org/ckfinder/userfiles/files/27952620268.pdfIn PDF document text
    • https://zapret-rf.org/web/img/podborky/files/75157604122.pdfIn PDF document text
    • http://bortran.com/upload/image/file/20210910013311.pdfIn PDF document text
    • https://doxity.ro/ckfinder/userfiles/files/59050319981.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/1sa49fl31fduarc7vs42l4ek75/90699622732.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134531ea5d76---65772703224.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/51901998577.pdfIn PDF document text
    • http://babyindex.nl/images/uploads/redogajulep.pdfIn PDF document text
    • http://dayou.tw/uploadpic/files/202109081658024812.pdfIn PDF document text
    • http://xn--80aadcnaeutgftohcogh8i8dsc.xn--p1ai/pict/file/18238964563.pdfIn PDF document text
    • http://senvietsystem.com/ckeditor/upload/files/20502504302.pdfIn PDF document text
    • https://protrialse.eu/files/files/479323314.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=xapk+how+to+openPDF 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_off0000d0a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0A4 18260 bytes
SHA-256: 3dbc683c613610cc49432141dd2b3b85c00d92b4b2276cb52556bbe6fa0911fb
font_01_sfnt_off0000ffa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000117ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117BA 10128 bytes
SHA-256: 930a8a4fc15cd721c683a1fa198d9140578588821e8fca1a4dd87d68c0eb6795

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