Malicious PDF — malware analysis report

Static analysis result for SHA-256 289477651e9ee8e8…

MALICIOUS

PDF

85.0 KB Created: 2021-07-29 13:42:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: c0541716b53300e526f4240fb2f814ec SHA-1: 4ffb218ca6edf3ec61f036e7263435c9db948d9c SHA-256: 289477651e9ee8e8f56f8c32b74981530d7c417f17a9f6e5c4efdd96eaf29c9a
176 Risk Score

Malware Insights

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

The PDF document impersonates a cloud file-sharing service, a common lure for phishing attacks. It contains a link farm with numerous URLs pointing to compromised or disposable hosting domains, designed to redirect users to malicious content. ClamAV and ML classifiers strongly indicate this PDF is malicious, likely a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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.
  • Cloud document impersonation lure medium SE_CLOUD_DOC_LURE
    Document impersonates a cloud file-sharing service such as SharePoint, OneDrive, Google Drive, Dropbox, Box, or Microsoft 365 and asks the user to open, verify, or access a shared document
  • 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://yule-sign.com/upload/editor/file/20210603044608.pdf In PDF document text
    • http://emeraldcovepartners.com/_data/images/file/gepivurudilawex.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2e7e503c7---gofinuvobirajibowip.pdfIn PDF document text
    • https://drisraadentalcenter.com/userfiles/file/menavumitenanuxo.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/v7qrtp7s28kct9qvq82a4opjju/rajiwewesizaditazosis.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/e28d8951994afd088a62b30868cef702/wivawumanegowivajupujegut.pdfIn PDF document text
    • http://autodilykanka.cz/cmsimple/images/file/gifukibedemewu.pdfIn PDF document text
    • https://bamor.org/userfiles/file/reronopatarowugesefodutex.pdfIn PDF document text
    • http://www.dramayaramendes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2f90b7285---nulujoger.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160982e7c70146---5780704898.pdfIn PDF document text
    • https://dunaweb.co/bg_image/files/vonitagawimedef.pdfIn PDF document text
    • http://upservice.expert/admin/ckfinder/userfiles/files/42178971880.pdfIn PDF document text
    • https://landi-bg.com/images/file/9204084318.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/m8rva1pnif851hnkigrlq01d9a/liwufavusisexajugavanetaj.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/96904286443.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c09c2109a61---76251360599.pdfIn PDF document text
    • https://luminex.pl/upload/file/54101588321.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609f41c331ec5---20894490728.pdfIn PDF document text
    • http://hkacca.com/userfiles/zinejesexek.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/0gb8tlbskkgdr1rs02va9urr2r/24301219988.pdfIn PDF document text
    • https://northwestconvention.cz/data/files/98873373937.pdfIn PDF document text
    • http://rotarylaspalmas.org/documentos/file/jimowafaberunezipe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+download+files+from+teams+chatPDF 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_off0000e9c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000101d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D4 16528 bytes
SHA-256: 34d85353767435f11e6c402efcfb1860fa62130fa5bdea6c0b47945dcd4222eb
font_02_sfnt_off00012d14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D14 10820 bytes
SHA-256: 8c82b74c2a83b95e2d9760f9698786d66644f4153d25dce74570f59d2cf96619

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