Malicious PDF — malware analysis report

Static analysis result for SHA-256 7da0b7b0baa1e6ec…

MALICIOUS

PDF

84.7 KB Created: 2021-09-20 04:26:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d4681884e1b58919f8b1f103d66dcc0e SHA-1: 525c631815bfc7fd35a236f894dd50e853252ae0 SHA-256: 7da0b7b0baa1e6ec1374bc2586d512c85f9b1ea162df602f2d2f7b7d5abe996c
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and does not provide direct clues, but the heuristic findings point to a malicious link distribution pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://garglob.ru/uplcv?utm_term=how+to+move+things+from+your+phone+to+sd+card PDF link annotation
    • http://tzsunup.com/upload/75761846215.pdfIn PDF document text
    • https://ceiling.holcom.vn/webroot/img/files/74342907849.pdfIn PDF document text
    • http://www.ciesol.es/ckfinder/userfiles/files/xuwofimo.pdfIn PDF document text
    • https://www.willmarareachamber.com/ckfinder/userfiles/files/beluxepebozolopuxoloderak.pdfIn PDF document text
    • http://hotel-gerard-dalsace.com/upload/document/pokijozaxomuxevasej.pdfIn PDF document text
    • http://cartopack.be/Images/file/tikekaroseturenugaxefagip.pdfIn PDF document text
    • https://ruiguoex.com/upfile/files/2021/09/03/55192982651.pdfIn PDF document text
    • http://nhakhoauytinhaiphong.com/upload/files/3221944142.pdfIn PDF document text
    • http://www.aunay-sous-auneau.fr/ckfinder/userfiles/files/benudelureta.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7bbbe17b3---xitimadagira.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/ceb75e6aebf4c920520ec69f016cd799/xusadedepipiri.pdfIn PDF document text
    • https://solener.info/ckfinder/userfiles/files/53499447925.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/47239947307.pdfIn PDF document text
    • https://paroles-vives.com/ckfinder/userfiles/files/89119782163.pdfIn PDF document text
    • http://wixoon.hu/upload/file/rimuwop.pdfIn PDF document text
    • https://learnrkbin.jugalbandiresearch.com/ckfinder/userfiles/files/fokajejorazimexatanokakij.pdfIn PDF document text
    • http://easytravel63.ru/ckfinder/userfiles/files/67244599016.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161434b356443c---magelojipegasuboxoki.pdfIn PDF document text
    • http://spamsmsgiare.com/media/ftp/file/79072772875.pdfIn PDF document text
    • http://buren-kompanie.de/userfiles/files/webojejinanabale.pdfIn PDF document text
    • https://jagominum.com/contents/files/bezuzogasivukax.pdfIn PDF document text
    • https://villamishkan.com/310renonew/front/images/files/biberatak.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/b0a013c761020c53df2bda1df7c4d6d0/sufomabexipoloro.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_off0000e520.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE520 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD32 17352 bytes
SHA-256: f8cd437600ce00d529244b33693e27d8797c2441585b11d66d9edd8fe2b278b4
font_02_sfnt_off00012a5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A5F 11380 bytes
SHA-256: 0c88944b21ca4fe82898efd5da38fe6e7b36be94260bf3fc4d91cb66894916e1

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