Malicious PDF — malware analysis report

Static analysis result for SHA-256 361bbb45d79c980b…

MALICIOUS

PDF

77.2 KB Created: 2021-09-18 00:33:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9eb6127176d95b677243be33fbbef337 SHA-1: 312c18fb29b0f735bc9f16e0e2dfdc62e5dbb8df SHA-256: 361bbb45d79c980bbb1ca089d1c76e982355b20f8279f179ad209415b633b265
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://alimentosldm.com/userfiles/file/kafejizomadadaw.pdf In PDF document text
    • http://internationalnetworksolutions.net/files/In PDF document text
    • https://immsac.pe/sgi_userfiles/userfiles/files/15911484532.pdfIn PDF document text
    • http://abhinavabhishad.org/userfiles/file/gitimezeloru.pdfIn PDF document text
    • http://vrakskodamnetice.cz/file/43667415056.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16144722c6cc22---31581700476.pdfIn PDF document text
    • https://mpressivelabels.com.au/application/third_party/ckfinder/userfiles/files/loresu.pdfIn PDF document text
    • https://toliveinchristjesus.ceosale.catholic.edu.au/application/third_party/ckfinder/userfiles/files/39743064402.pdfIn PDF document text
    • https://budapestpainter.hu/ckfinder/userfiles/files/28471036188.pdfIn PDF document text
    • http://ntouioc.ntou.edu.tw/ckfinder/userfiles/files/bofudademepigasapiku.pdfIn PDF document text
    • http://tpokebar.com/uploads/files/27371576766.pdfIn PDF document text
    • https://gamedunyasi.com/calisma2/files/uploads/rekirigikirasuvumezorola.pdfIn PDF document text
    • https://sadhankendra.org/erc/media/13838253790.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16133e98b2727b---fubilejon.pdfIn PDF document text
    • http://goodfortune.hk/UpLoadFile/file///kunetobenutinufubeg.pdfIn PDF document text
    • https://mikludava.lt/images/files/vupadufube.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/b199ebd7e4522ecea3f0cf934d114ea5/54560431546.pdfIn PDF document text
    • http://websurin.net/UserFiles/File/bezidiwub.pdfIn PDF document text
    • https://selispin.com/calisma2/files/uploads/13477887791.pdfIn PDF document text
    • https://renesens21.com/ressources/upload/files/maguxivozu.pdfIn PDF document text
    • http://canissapiens.com/images/uploads/file/86864992941.pdfIn PDF document text
    • https://sklep-pinokio.pl/web/uploads/files/62249829631.pdfIn PDF document text
    • https://cupanghitam.com/contents/files/zivuzozok.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/afaf4726d29c73e46157768659537f52/nilewuvop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=photo+express+app+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_off0000c9d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9D2 10588 bytes
SHA-256: 286c1cce8359f39727ef0fabb578c1327e7119d4231b047857dfc0972af021b1
font_01_sfnt_off0000e20f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE20F 17632 bytes
SHA-256: 7784b061d92a55ed2e38aa533d5163f907e478e12447bd39799e6ed515d18869
font_02_sfnt_off00010f0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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