Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6b11f2d958179bd…

MALICIOUS

PDF

75.0 KB Created: 2021-09-15 15:02:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: daebba79c1ba59b4bac1fbc582d8fb5c SHA-1: 8f810385ca06d607404d9cd831197672d6c2679a SHA-256: a6b11f2d958179bdde06f2d762f7b31aff888bd4b75c3d155b7afc41a8762a93
156 Risk Score

Malware Insights

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

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, directing users to multiple external websites, some of which are hosted on compromised CMS uploads. The primary goal appears to be to lead users to potentially malicious or phishing content through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613e7c0ab2b44---kesumelajepazala.pdf In PDF document text
    • http://twozonechickenlasvegas.com/uploads/files/zufaw.pdfIn PDF document text
    • https://sicurezzaips.it/uploads/file/54731049329.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140db149c37d---zazomovedutulerusevewaji.pdfIn PDF document text
    • https://ginecologmuresan.ro/ckfinder/userfiles/files/rawagixateved.pdfIn PDF document text
    • https://tjpapigroup3.com/contents/files/62099636200.pdfIn PDF document text
    • https://aporpeter.ro/userfiles/file/38976408355.pdfIn PDF document text
    • http://ymjgolf.com/file_media/file_image/file/91876803084.pdfIn PDF document text
    • https://designmaster.in/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/40642462174.pdfIn PDF document text
    • http://kondicionery-elektrostal.ru/upload_picture/file/5964897176.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161408fc518027---6166873901.pdfIn PDF document text
    • http://sun-green.nl/ckfinder/userfiles/files/13782853876.pdfIn PDF document text
    • http://garmaclima.com/uploads/ckfinder/files/50522487680.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/75327947490.pdfIn PDF document text
    • http://clubselectionvoyages.com/images/file/61743904888.pdfIn PDF document text
    • https://marbletreasures.com/uploads/image/files/fetodukenep.pdfIn PDF document text
    • http://p-itos.net/admin/userfile/image/file/lapejogefukubob.pdfIn PDF document text
    • https://lufty.cz/UserFiles/files/23035146205.pdfIn PDF document text
    • http://dokumsuzgec.com/userfiles/files/segisufokapagapufupasutad.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/sekokigoxitapafa.pdfIn PDF document text
    • http://debseven.net/UserFiles/File/41235471514.pdfIn PDF document text
    • http://rainternacional.com/userfiles/file/sakoruvamam.pdfIn PDF document text
    • https://funbugs.ie/files/file/texekotixal.pdfIn PDF document text
    • https://jerseyshorepirates.com/userfiles/files/58519386287.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/38871675712.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=statistics+for+machine+learning+book+pdf+free+downloadPDF 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_off0000bcf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d507.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD507 17220 bytes
SHA-256: f33996a0280ff93ed5297a85e67b092a20ea0fcd2df5d6e2bcdde7c7a5c5a099
font_02_sfnt_off00010193.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10193 11460 bytes
SHA-256: ef7d0b7f67bab598c407deffbd192a9fde8674da498da6a6507366c17b96a46b

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