Malicious PDF — malware analysis report

Static analysis result for SHA-256 900ac127384e2873…

MALICIOUS

PDF

100.7 KB Created: 2021-07-21 22:14:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 960bcd5a50a88c2e0db3c0ab876362d6 SHA-1: ad4f8683fe17b17e002320c11d075d80706ee456 SHA-256: 900ac127384e2873e4210556c4e2d52588816c7b16e0bc67224587ecac53bc34
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress upload directories, suggesting a link farm designed to distribute malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution attempt, likely leveraging JavaScript for execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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 http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160943046b3ea3---51021228311.pdf In PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4b82f12130---dororogixojikajizokagi.pdfIn PDF document text
    • http://moscow-vernisage.com/files/files/gopunafezozajeleso.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/1d40267bd0966a3b7e45271a4f9b87a7/getuxewurugi.pdfIn PDF document text
    • http://v-lukomorie.com/uploader/files/86368372996.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160eca673eab8d---mirix.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/ninuner.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/60259ec1519f32cdda7bad47927e67b3/nemutisetizosubun.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/27777540588.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/30585769950.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/bbbc1847771d8f6f9ba75b37fc001c94/revaneja.pdfIn PDF document text
    • https://menu2uplus.com/images/file/mizulu.pdfIn PDF document text
    • https://rintrans.com/files/vomupitiviralosa.pdfIn PDF document text
    • https://afayl.com/userfiles/file/91844553126.pdfIn PDF document text
    • http://crmrealty360degree.in/userfiles/file/zelisuriliwaje.pdfIn PDF document text
    • https://riolospettacoli.it/filesUploads/file/bajobepikugevunu.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160827ed601ec0---munisudifarotizosi.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/ob4keuqti5g70ethtvo5evm4k2/22374894865.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/626e92cd53598fc2c97ef14d146f82f1/nenejawuxawa.pdfIn PDF document text
    • http://gdlianyu.com/uploadfiles/file/zetalutaripiruwularire.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=have+the+relationship+you+want+pdf+freePDF 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_off000125f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125F2 17756 bytes
SHA-256: 759cd4d3e90eb9dfc826651109b961795e389df76e701ad521ce690ef0654d87
font_01_sfnt_off00015415.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15415 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016c2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C2C 10952 bytes
SHA-256: 6c013cd08575abddbad43195c83cfba0f1bff9eb9051938b3f05aea516950615

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