Malicious PDF — malware analysis report

Static analysis result for SHA-256 964e5734402349e9…

MALICIOUS

PDF

71.7 KB Created: 2021-09-09 00:52:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3d928e7458c3a2f0d0ba6594add46cc1 SHA-1: 2bc32bbfc005d98a6de171249960194a7d2c319e SHA-256: 964e5734402349e90188bb0094f0c27d861176b56293f4a4eece9016008c818f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Static analysis reveals it functions as a link farm, with numerous embedded URLs pointing to potentially compromised websites or disposable hosting. The presence of 'utm_term_redirector=True' and the structure of the URLs suggest an attempt to manipulate search engine results or redirect users to malicious content, possibly a phishing lure or malware download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://mazraeir.com/images/upload/files/semisiginaperoxalez.pdf In PDF document text
    • http://tinavaron.com/ckfinder/userfiles/files/wuzorenovifenajute.pdfIn PDF document text
    • https://telechips.com/ckfinder/userfiles/files/91511945037.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/49065787053.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/nabiwidebo.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/8a0b496bb2bda4c1b395f47976d2091c/zexowewikejuje.pdfIn PDF document text
    • https://sskundal.com/userfiles/file/riliximaburisukalefere.pdfIn PDF document text
    • http://barahi.com/assets/userfiles/files/fudotube.pdfIn PDF document text
    • https://larrialdiak.es/files/galeria/files/vofopufed.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132ac43b97c2---vepotelebusifetikibomadut.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f93479a3ac---39312892997.pdfIn PDF document text
    • https://weekendtripskolkata.com/userfiles/file/tadurox.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/48207077976.pdfIn PDF document text
    • http://paddockj.com/user_data/editor/ckfinder/core/connector/php/upload/files/67445555877.pdfIn PDF document text
    • http://jyotiacademicpress.org/uploads/file/kolafufusumanomewakiva.pdfIn PDF document text
    • http://istanbulballoons.com/ckfinder/userfiles/files/rusakobepagajifolid.pdfIn PDF document text
    • https://vzglavniki.net/data/file/14375753635.pdfIn PDF document text
    • http://protrialse.eu/files/files/811165988.pdfIn PDF document text
    • http://chanakyaaerospacedefence.com/userfiles/file/99805249917.pdfIn PDF document text
    • https://goez1.com/10005001208290177/ckfinder/userfiles/files/19974150437.pdfIn PDF document text
    • http://viquadro.com/userfiles/files/rezojo.pdfIn PDF document text
    • http://www.ximangsongthao.com/app/webroot/uploads/files/keledixofan.pdfIn PDF document text
    • http://invismortgagebroker.com/images/file/74955029462.pdfIn PDF document text
    • http://www.tecs4.com/intranet/ckfinder/userfiles/files/32323104544.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=cinema+hd+url+for+downloaderPDF 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_off0000b603.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB603 16440 bytes
SHA-256: 47b97b5749270fdd4a07fa59eb1d347558a017f793b1ee8159ad46f9602a74fe
font_01_sfnt_off0000e0c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f8d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D7 10572 bytes
SHA-256: 5d9b3d3a07f5fec7eaf867e3fd3bb7c784b298ed4708d318fce3584fba6d2a82

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