Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab59d9e536603dcf…

MALICIOUS

PDF

94.0 KB Created: 2021-06-26 11:16:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d862afdb4c9b3c230f99fed13e1880cc SHA-1: 63e514b04d8ae98d497bdd83ad67416b7ff3ac92 SHA-256: ab59d9e536603dcf50d1e3d09c415e6e4c97950bf667f06ad8f8d1c3253f2511
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating phishing and trojan behavior. It contains numerous links pointing to compromised WordPress upload directories, suggesting it's part of a phishing campaign or a link farm designed to redirect users to malicious sites. No scripts were extracted, but the presence of external URIs and compromised CMS links strongly indicates a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

Heuristics 6

  • 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.
  • 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://irlanc.ru/uplcv?utm_term=community+stakeholders+meaning PDF link annotation
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160ac9df5d3444---nopizoluwuxujo.pdfIn PDF document text
    • http://pronobile.de/catalog/file/74594321584.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a02dd7daf77---79227099099.pdfIn PDF document text
    • https://svingenieria.cl/userfiles/file/luwojezasa.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/75340306929.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c64abff3739---78507261467.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16085ba4a96495---pebabalif.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/fd441c63d79aaec7ddc4cbbc1abc8a28/durototonotumaxelopi.pdfIn PDF document text
    • https://nbcmedia.vn/ckfinder/userfiles/files/jatowupaxadimiredizojiba.pdfIn PDF document text
    • https://brahmagnanam.org/fck_uploads/file/wusos.pdfIn PDF document text
    • http://ort168.com/upload//ckeditor/files/sedovuvad.pdfIn PDF document text
    • http://perilatomsk.ru/ckfinder/userfiles/files/xipekogosufowasewapere.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/idru3sspf54mk87fnd211erhga/watedejenipufil.pdfIn PDF document text
    • http://lex-ter.ru/admin/ckfinder/userfiles/files/79573721664.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160b650ddefd24---50299341384.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160917bfca66e2---vajafopuk.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8864633cb---5139430366.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/f2pk66lv969dl81c0onbfrpgje/dagurovaxoxuliv.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/2056eai1jj07tn72u8rfuaea2h/4405182173.pdfIn PDF document text
    • http://cuacuontoanthang.com/media/file/29843235970.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1c9b171a2---27119413141.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160829b155f025---84641838308.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2e9efb0d95---32515514356.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/30b0fg05ct07mvtmmkq5dkkev3/24726793131.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c5adc65b8a8---93218309176.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9392219d06---retalikafajusavowa.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_off00010ac5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC5 11032 bytes
SHA-256: 5729f1af1216cf788c4293e10951fd2c8acb53cb3c628880208d5ab400603d67
font_01_sfnt_off00012414.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12414 17732 bytes
SHA-256: 5a3f8bfb220d32d0d28b50e07c7d893a15d2f374c2cbf56d0b05c2947935b315
font_02_sfnt_off000152a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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