Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8c45d02800c50ba…

MALICIOUS

PDF

79.5 KB Created: 2021-08-25 21:23:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: fc5863e3abc6185b856b38eb1fdb0e90 SHA-1: 4655e46954908655c54c6543c60d773761d172b7 SHA-256: a8c45d02800c50babf7c55d551d3fefd59616ea3111f24f1a65817d0488a32bf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious. It contains a link farm pointing to numerous compromised CMS upload locations and disposable hosting sites, suggesting a phishing or malware distribution attempt. The presence of external URIs and a link farm indicates an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://nomylo.ru/uplcv?utm_term=down+at+the+mouth PDF link annotation
    • http://alburigiott.it/userfiles/files/xiripobanopopovawakobemem.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/391231df4a85924be5214f06eb562af6/gusevug.pdfIn PDF document text
    • https://volnynaklad.cz/data/file/naxizedalutod.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/gbos5hp3te2pdg339unknmf5tl/71659710482.pdfIn PDF document text
    • http://asu78.ru/userfiles/file/45035217355.pdfIn PDF document text
    • http://thevisionkharj.com/userfiles/files/23342389837.pdfIn PDF document text
    • http://parkhigh65.com/clients/4970/File/bezowinunu.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/flgp00ugruf8vovg41djiqmen3/63467851780.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/e768io6m7jinqfpbvfo2818iiq/befesotemu.pdfIn PDF document text
    • http://kuwaited.com/cote_dor_import/admin/ckfinder/userfiles/files/74793961136.pdfIn PDF document text
    • http://mevlanaasm.com/resimler/files/62998279371.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a53cfae211e---96737356144.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071442c1b939---16665602864.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a48df69d6d2---55984417052.pdfIn PDF document text
    • https://orrizon.ru/images/file/nuwugaxenamabuno.pdfIn PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/g2j7ks9dpfuk43ns290b4kmag7/32516118154.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/532684bd9c3844c2b0e74443b23c223d/kitek.pdfIn PDF document text
    • http://namlinhchisapa.com/userfiles/image/file/tejabivusokus.pdfIn PDF document text
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/99120325730.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b04295a3c9f---61454867820.pdfIn PDF document text
    • http://gleneaglehoa.org/images/file/nevuxuvomazaneto.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9b4bdaa7d---meliranar.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_off0000d27e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD27E 10156 bytes
SHA-256: 8574087aa07c35edb6cb74daafbdab265b97d3f9e668ffd5f67f36d95e0711cc
font_01_sfnt_off0000e90f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE90F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010121.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10121 17896 bytes
SHA-256: 5adfec306f82a8b41ba30fcd035526b4aa31632ec1e7abdbaa6a95d2fc6188ef

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