Malicious PDF — malware analysis report

Static analysis result for SHA-256 e12dde56136b7d5e…

MALICIOUS

PDF

96.2 KB Created: 2021-07-27 09:04:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ad32bba928c9809a37cfb9ed062ec34b SHA-1: 4b0d0ef3019e80cba722f5e9b322fa40edc89d98 SHA-256: e12dde56136b7d5e5585add6179932c84fa7ca3fa2fa6ff4e7515c63c8bad8bc
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 WordPress upload directories and other potentially untrusted hosting. The primary purpose appears to be directing users to external, potentially malicious content, which is a common tactic for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/87v88p6upk60jiteobbeq9thj9/78682632281.pdf In PDF document text
    • https://coebmsf.com/userfiles/file/55336818816.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/89103423431.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/70220934800.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/jlvek288eus1m0fr9kg7q69rin8nirs6/gitoxavofixet.pdfIn PDF document text
    • https://bdblue.com/ckfinder/userfiles/files/29667322646.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/2bbeabd31f72a37c8b7c57aac5fe2d86/deruvabanotixuzokisubasoz.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/ff4328537dd8b79724c87918f5b3ec70/sazoson.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085602c126bb---50624303825.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ae6079f1101---5454717789.pdfIn PDF document text
    • http://golfproradost.cz/webpagebuilder/ckfinder/userfiles/files/xifidiwoxurapefebixeva.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/dakajugunopuponilamasedu.pdfIn PDF document text
    • http://faw-asia.com/image/upload/files/zoxezuxalulobijuwizep.pdfIn PDF document text
    • http://greece-ex.com/images/blog//file/biwitirupizosujimunujuna.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/89823031174.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/jasupexuzifatanox.pdfIn PDF document text
    • https://www.truegridpaver.com/wp-content/plugins/super-forms/uploads/php/files/f4b0be1201b00165b40ed69bb31331c2/xivozarofokajotimige.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/g30qqj0mpfd96rrfcgs1fcl1nv/25507720007.pdfIn PDF document text
    • http://articolo17.it/siti//usr/foto/files/6309511123.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093e82a5ddcb---2020012995.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/knqs9hck3df7cbf7ui3a8ls7d5/gamutebajepatizugeni.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf6af42b3a---87076364798.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=how+long+will+a+mini+split+lastPDF 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_off00011368.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11368 17532 bytes
SHA-256: 58ce5a170b02d23da8750dd9ded37b4bce7947508103d6d1c881729a9db3190e
font_01_sfnt_off0001417a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1417A 10440 bytes
SHA-256: b23c3b48fe21443f0e15a0d589ebda2890225164cc64eae2776427a33993f782
font_02_sfnt_off0001592d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1592D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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