Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1a8fcec89a79451…

MALICIOUS

PDF

75.4 KB Created: 2021-09-06 06:17:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2cb443923e1dc8284eb3ccd672a4a283 SHA-1: 6def0d60282c360753f7120f55fca80ae77f9022 SHA-256: f1a8fcec89a79451da431587db82238afa1f9058b1887258969c6aaa06123ab0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan PDF. It contains numerous links to external websites, many hosted on compromised WordPress sites, suggesting a link farm or redirection mechanism. The presence of embedded URLs and the nature of the heuristics point towards an attempt to direct users to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://medvor.ru/uplcv?utm_term=community+land+act+kenya+pdf PDF link annotation
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b927613d7b9---99480430372.pdfIn PDF document text
    • https://store-connector.com/_upload_bilder/_filemanager/file/42874390040.pdfIn PDF document text
    • http://hillsdale66ersreunion.com/clients/c/c6/c679c52642bc64dd8629b98fb95ccc77/File/62769907980.pdfIn PDF document text
    • http://ronaldtan.nl/images/photo/baxobuzototota.pdfIn PDF document text
    • https://ikima.fr/uploads/file/88382237388.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/16127d1596c4f8---zebitaselevesip.pdfIn PDF document text
    • http://kunmobile.vn/files/uploaded/20210805/file/41722010431.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/3a0449e673d2796538163794b79a3729/89063866789.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b423c09a317---53604254555.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160e4afdda4e4e---bekozomikipuzu.pdfIn PDF document text
    • http://showplus.ae/userfiles/files/gipegineruzogokivepokef.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/334011bfafbe13fedffb8b6e7e114fce/53107610729.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/8764a9c706fc21cd88c258a6848ff88e/33786804736.pdfIn PDF document text
    • https://tselectromechanical.com/uploads/CKfiles/files/vaziratos.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/f4af16a585f03df03771cf12461c354f/givafuvukopu.pdfIn PDF document text
    • http://hooleihomes.com/cms_images/file/bixevege.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608020b36f763---69595552583.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210805222400125823630.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c35041b54ac---marokaxisadexode.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/81c8fb7ad59e7de2373037020fd3efcd/51795723501.pdfIn PDF document text
    • http://xn--h1aaebbkfib4a.xn--p1ai/sadm_files/31632053546.pdfIn PDF document text
    • http://ixtvs.de/_upload_bilder/_filemanager/file/lonovuxijadomejo.pdfIn PDF document text
    • https://ngonluathan.com/images/ckeditor/files/katofiw.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bdda140c8a---22679663087.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_off0000c411.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC411 16896 bytes
SHA-256: 09bdb5a7c340f9b32f29222f569a402aec1630e2027fd8e05dfa87898d2e8427
font_01_sfnt_off0000eedc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEDC 10852 bytes
SHA-256: c153f3f8bfc484624e7314cc87ebc9e6caa4d1f15ec18292a9d8550ae4cf950e
font_02_sfnt_off000107f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1