Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1009d77c533c4be…

MALICIOUS

PDF

83.8 KB Created: 2021-09-05 19:43:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 76ab3c1d8e40bae23bab696ef8f71d40 SHA-1: 55e5d32311c5a49a41242c9449e22da9874e0f39 SHA-256: f1009d77c533c4be0a96bc0c7774e66ff0c262beeecf8c86aab3f26fe7666b17
156 Risk Score

Malware Insights

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

The PDF contains numerous links to various websites, many of which are hosted on compromised CMS platforms or disposable hosting, suggesting a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of multiple unknown URLs indicate a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://gps-tw.com/CKEdit/upload/files/7585873746.pdf In PDF document text
    • http://daydreamspin.com/userfiles/file/73724379525.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a2cac7e68bc---gojiso.pdfIn PDF document text
    • http://verkaufs-akademie.com/userfiles/file/xotimasorurugipapar.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/8d80bfb3628e5bb3ef699d8e709e853b/35124038886.pdfIn PDF document text
    • http://heydarbaba.org/resimler/files/regifemeselugigewo.pdfIn PDF document text
    • http://anandtouristcorporation.com/uploads/mujedifuzo.pdfIn PDF document text
    • http://mayinmaunhat.com/upload/files/kabege.pdfIn PDF document text
    • http://airelimpio.mx/img/editor/file/34474518222.pdfIn PDF document text
    • http://czechdidgeridoo.com/admin/upload/file/mabiju.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/79lv2pirs4d13mbudapp4a6p8a/mizodafufoxari.pdfIn PDF document text
    • http://stevis.cz/files/file/relojabaniduji.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160741e3c42324---87750344701.pdfIn PDF document text
    • https://loyalangkorapartment.com/userfiles/file/37181685587.pdfIn PDF document text
    • http://mistral-paints.cz/userfiles/files/fusewoweragibigaxiwa.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/cb4501f94f157ceb39f039b5d6548b80/bibiwuxigemugup.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/161045f6729e58---81783570528.pdfIn PDF document text
    • http://ourconn.com/userfiles/file/202107260330142162.pdfIn PDF document text
    • http://donkaew-furniture.com/ckfinder/userfiles/files/12362979607.pdfIn PDF document text
    • http://praconsulgroup.ru/pict/file/nabemuwubed.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160981fe118f48---26255820921.pdfIn PDF document text
    • http://xn--h1agcmh.com/ckfinder/userfiles/files/pozuj.pdfIn PDF document text
    • https://wecareu.net/ckfinder/userfiles/files/dedopesujixomuxuroseb.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/c3808d3b076df8cc272c49f2a70945f9/bivegirone.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=rar+file+pdf+converter+free+onlinePDF 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_off0000e247.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE247 10556 bytes
SHA-256: 96d43bdd8574cab8eb0a7350f9f907f8073d5f73d62e4c9a8264efeb2f0bb5da
font_01_sfnt_off0000fa71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA71 18612 bytes
SHA-256: 34b4b6028f29b1d2dfe253b3c4fe17229e821bc774aaea2523ad878e7c9dd7a0
font_02_sfnt_off00012934.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12934 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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