Malicious PDF — malware analysis report

Static analysis result for SHA-256 a138dbe314b67f0c…

MALICIOUS

PDF

80.1 KB Created: 2021-09-18 14:33:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 153ace1118fbdcd027591ebde24efe64 SHA-1: 79cc5a99da57fd8fcce9d95596fc5d889ff00e3f SHA-256: a138dbe314b67f0c0e2e241687d4f949df347a6573a702b2f3d6a690d0baef92
204 Risk Score

Malware Insights

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

This PDF document was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing and trojan delivery mechanism. The document contains numerous links to external sites, many of which appear to be compromised or disposable hosting, suggesting an attempt to distribute further malicious content. The presence of a 'Browser extension / update installation lure' heuristic indicates the document likely attempts to trick the user into installing malware disguised as a necessary update.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://garglob.ru/uplcv?utm_term=idm+internet+download+manager+chrome PDF link annotation
    • http://ajej.pretty-match.com/upload/files/wutave.pdfIn PDF document text
    • https://www.fangjin.org/ckfinder/userfiles/files/nuwijezopibojokasav.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/16138079c39ba2---rogiwokitaporirikilokam.pdfIn PDF document text
    • http://revize-elektro.info/UserFiles/File/siropazut.pdfIn PDF document text
    • https://msiutilities.net/documents/54364603549.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16143dc1e20145---99733316354.pdfIn PDF document text
    • https://abisspaandboutique.com/nbloom/fckuploads/file/48386983646.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16130e13d2e6d8---34330864715.pdfIn PDF document text
    • http://centralcogtc.com/uploads/file/17641868459.pdfIn PDF document text
    • https://epagneuls-bretons.fr/caningest/images/file/80085040307.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/gue3rfe91gnrr6le0r20r1rfre/81917438414.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16140d664b04cf---nibimivixusapuvogakibe.pdfIn PDF document text
    • https://ssekolkata.com/ckfinder/userfiles/files/timag.pdfIn PDF document text
    • http://rotang.net/userfiles/file/46465782026.pdfIn PDF document text
    • https://coffeetuanvang.com/Images_upload/files/30111379455.pdfIn PDF document text
    • https://charteriraq.ir/basefile/charteriraqir/files/zajaroxekagiwudubenajoze.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613d8ee62808e---nusisifoboropazeva.pdfIn PDF document text
    • http://yilbasipromosyonu.com/userfiles/file/vefizapawoxuranir.pdfIn PDF document text
    • http://career-id.org/ckfinder/userfiles/files/61584640265.pdfIn PDF document text
    • https://mallncart.com/userfiles/files/89818016135.pdfIn PDF document text
    • https://landi-bg.com/images/file/78401596616.pdfIn PDF document text
    • http://zeminyerkaplama.com/upload/ckfinder/files/wupileworudulibiru.pdfIn PDF document text
    • https://institutdesante.org/userfiles/file/gogeruguji.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/b933290210eabbc44a6460497d8c3973/mebazusa.pdfIn PDF document text
    • 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_off0000d6ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6AB 10684 bytes
SHA-256: 3dcc7d82ebfa3407746e21c6762679fbb663d6f17f156c4317c38396b14aa6f9
font_01_sfnt_off0000eebf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEBF 16664 bytes
SHA-256: fb88c54997d3b450a946afc6800e1499ef1bd92edcef19925266f58208023c22
font_02_sfnt_off00011960.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11960 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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