Malicious PDF — malware analysis report

Static analysis result for SHA-256 76d1f72c2fde0133…

MALICIOUS

PDF

90.2 KB Created: 2021-09-01 10:56:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ccf4fdf728c21de1a213e953a7f6b58a SHA-1: bc868798799e715f5b8a079b2408a798701160b2 SHA-256: 76d1f72c2fde013397fc7979b850fadecec6bf1fe4f66e5016de6d8a883450e8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious activity, likely involving the exploitation of PDF viewers or redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://fdscience.com/UPFILE/userfiles/files/54240280953.pdf In PDF document text
    • https://ises.ca/phpsites/vertical_living/uploads/file/luxamogon.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/624e2262a26a98a89e213c97fab4c5a2/80940281103.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/ife37rhphg88q003s1saenmbp0/67335903638.pdfIn PDF document text
    • https://sedefartphotography.com/resimler/files/vemuf.pdfIn PDF document text
    • http://qazaqbanki.kz/data/content/files/gelabu.pdfIn PDF document text
    • http://sun-green.de/ckfinder/userfiles/files/fokekusu.pdfIn PDF document text
    • http://happinessgown.com/upload/users/files/33581125058.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/34923488de9baa0e843faa7bdb501bcf/12370215782.pdfIn PDF document text
    • http://youngthisyear.com/ckfinder/userfiles/files/2899635219.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/hai5bj0e17a3iu7soch4vr5t45/sipimixibeta.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/fugaxemobilikako.pdfIn PDF document text
    • http://copingconversations.com/userfiles/file/30393792028.pdfIn PDF document text
    • http://thestarbusan.com/FileData/ckfinder/files/20210723_37B01C40DFA52F51.pdfIn PDF document text
    • http://studioingtassinari.eu/userfiles/files/mutuwujejowuj.pdfIn PDF document text
    • http://zae.me/datafiles/file/97753074305.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160885dc880ed5---3821297487.pdfIn PDF document text
    • http://live-lessons.net/lcj/web/uploads/assets/file/8062081706.pdfIn PDF document text
    • http://phsclassof1970.com/clients/875774/File/66260920411.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/kazaxavowutudepufitofi.pdfIn PDF document text
    • http://aweibel.com/Photo/file/28989918458.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/9dcb4ba4b73d6c4a0d77846820fb37d1/senedisalelofolikoramibu.pdfIn PDF document text
    • http://rafaelokazakov.com/file/sezurejewojila.pdfIn PDF document text
    • https://hagepoorter.be/files/files/xolejowatafobufesoja.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/jdmfm6716348hau5g24ed6a355/4506263422.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=html+all+tags+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_off0000fb42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB42 17620 bytes
SHA-256: b961cec151ab9ddd8f78d421e2ad9b93197bcd98981fb43c37789b7be6733dc9
font_01_sfnt_off00012951.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12951 10824 bytes
SHA-256: d62763748c53de623eb368b5d1deebb3f6c2aac4fa4e8bee770a5c34b35840c8
font_02_sfnt_off0001421b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1421B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1