Malicious PDF — malware analysis report

Static analysis result for SHA-256 c61c8c765a6346b0…

MALICIOUS

PDF

87.9 KB Created: 2021-07-06 14:32:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b68369de0adc87d8c60dd89ed0c976d1 SHA-1: 437b20f8283cd5fa876d6c57d9589173fa677d4a SHA-256: c61c8c765a6346b00837aac20d37562841a25dccd5190f0b2133bbfe3705da77
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The document body was unreadable, but the presence of many external URIs and the overall structure strongly suggest the file's purpose is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/5110e749f2caeadae434cd0a30c73150/sitizosazuviwurewefuna.pdf In PDF document text
    • http://michianaorchidsociety.org/clients/2/28/2832e32407c795c8d28ffe68102aa18e/File/refigobadanilosox.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/68bacdebd70afca5c199f05ac6a6ec5d/jugunu.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a305db3bc8c---futobe.pdfIn PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/xopuwamil.pdfIn PDF document text
    • https://incoyun.com/calisma2/files/uploads/88013188251.pdfIn PDF document text
    • https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/7derml9r777ikp2l1e75jhoafq/69465714525.pdfIn PDF document text
    • http://guides2alpes.org/uploads/file/wumewa.pdfIn PDF document text
    • https://petrovsky14.ru/docs/files/21517311606.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/770d73uvmr1ckacn9nkdftdvm0/37522181731.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/8e8eb0ba83be1eb993b3665565728578/16074835814.pdfIn PDF document text
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/99307076208.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3d80706c9---paxuguvelegus.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb641e71c0d---vosido.pdfIn PDF document text
    • http://parejalecaros.com/adjunto/upload/fck/files/49735248417.pdfIn PDF document text
    • https://chp-travel.ir/data/file/54044180748.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/709c99664f06fbcb2090a2ec71270d2a/jipigonudegara.pdfIn PDF document text
    • http://beachhigh65.com/clients/879402/File/57199204061.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/wawep.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/e701ce79a98bd7cdf87fe598ced097b0/zujawaporazotu.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c65c9da59e---95021082908.pdfIn PDF document text
    • http://fabriziocar.it/userfiles/files/tinimet.pdfIn PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/d7095b2497df96677029124c47886b24/41687624725.pdfIn PDF document text
    • http://cableesmaltado.com/d/files/86628428232.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/g2orq6dtvrbuemn84rlhsejl83/41034967285.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=human+nutrition+pdf+free+downloadPDF 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_off0000f498.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF498 10668 bytes
SHA-256: a41144a95f62f8de3e3508894fb5b76a266b5b9caa524b0d82cf7b15d0d265a5
font_01_sfnt_off00010cf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF9 17472 bytes
SHA-256: 04e424af4c61041dd02eb438fdb4c7c0ba22fb89531f7e9b9ee5156401cfe24f
font_02_sfnt_off00013a5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1