Malicious PDF — malware analysis report

Static analysis result for SHA-256 44a3cb281f76933e…

MALICIOUS

PDF

78.9 KB Created: 2021-09-10 03:06:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 18917eeaf5c182ff885dd60cd268ed00 SHA-1: 9fa145ba66aab8c15fdfae3f4732b94b7109170d SHA-256: 44a3cb281f76933e4d23873e7930934a976fbb24affe8b63225003f6c24859a2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many pointing to disposable hosting or compromised CMS upload directories, indicating a link farm designed for SEO manipulation and potential phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or delivering a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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://mrcookie.tw/upload/editor/file/072054032709.pdf In PDF document text
    • https://mcq-exambd.bdbabymart.com/app/webroot/ckfinder/userfiles/files/79769694726.pdfIn PDF document text
    • http://factblogs.com/uploaded_files/userfiles/files/21179629711.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/lelokidexu.pdfIn PDF document text
    • https://yennenga.org/business_school/uploads/file/bimitamujuwamamoveziv.pdfIn PDF document text
    • https://wecareprogram.org/images/file/30253141142.pdfIn PDF document text
    • https://olivier-daulte.com/ckfinder/userfiles/files/18309098199.pdfIn PDF document text
    • http://5percent-design-action.com/upload/users/files/98833496370.pdfIn PDF document text
    • https://landtop.com/filespath/files/20210909170416.pdfIn PDF document text
    • http://giaydantuongphongngudep.com/images/news/file/turajalisa.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/zidubewis.pdfIn PDF document text
    • http://maulich.vn/attachment/files/fogiletasedanudilazo.pdfIn PDF document text
    • http://faizleathergloves.com/userfiles/files/tarukib.pdfIn PDF document text
    • http://tms-technology.com/ckfinder/userfiles/files/tabon.pdfIn PDF document text
    • http://autoservizimensi.it/images/fck/file/56678212025.pdfIn PDF document text
    • https://kildevangen.dk/files/87176873429.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/9604524752.pdfIn PDF document text
    • http://xn----7sbicwad4afgcgd5aph7d5e.xn--p1ai/ckfinder/userfiles/files/muwijinogopajepe.pdfIn PDF document text
    • https://dananeye.com/uploads/files/202109031318228191.pdfIn PDF document text
    • http://jr.ac.th/ckfinder/userfiles/files/supuvupejazati.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/161328767720fd---xolemexuxatoxitadak.pdfIn PDF document text
    • https://mintedimages.com/ckfinder/userfiles/files/63353784099.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/ec92f0f6e923099a44948a80a4048a25/76513439858.pdfIn PDF document text
    • http://eurogeographyjournal.eu/admin/fckfiles/file/mumoxowesebufasofola.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=deities+and+demigods+cthulhu+pdfPDF 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_off0000cdc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDC5 17784 bytes
SHA-256: d6041571be65b049771b3f18c8726eb01baa375b695f788a3d34ca3fc4594617
font_01_sfnt_off0000fc81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC81 11068 bytes
SHA-256: 655857babbf6a4a32fe763223818d40a89959066ffadb2eb53ec4a6a935f13ba
font_02_sfnt_off000115e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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