Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a5c91fafdb42350…

MALICIOUS

PDF

70.3 KB Created: 2021-09-07 09:22:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f285c8e2559300b7fb19b32d299e27ab SHA-1: b14fc90c9457286f85679b843602715d870c8282 SHA-256: 3a5c91fafdb42350aa57cf6e01e1a158415848824c53bbaf86cab9d64141c6e4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to potentially compromised or disposable hosting, suggesting a link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm heuristics suggest an attempt to lure users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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 https://xn--80aaijzh9b.xn--90ae/documents/file/50290532173.pdf In PDF document text
    • http://tscyw.net/userfiles/file/20210619002827_gr6lei.pdfIn PDF document text
    • http://menloathertonhigh1980.com/clients/6/6f/6f83464fe0b13873896cace574d4baa5/File/xokabejukovefifixugutube.pdfIn PDF document text
    • https://sahodayabbsr.com/test/fckeditor/file/xufuzorofomukenubogen.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6e6e3aaadd---gesetatoledorewanimipodu.pdfIn PDF document text
    • https://cihangirhotel.com/upload/ckfinder/files/bivakebusigimogejeretax.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160f2d77a3421b---48007750469.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/vikonub.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7f017a300---turiga.pdfIn PDF document text
    • https://madhubanindiancuisine.com/nbloom/fckuploads/file/75182859.pdfIn PDF document text
    • https://www.deuba.info/wp-content/plugins/super-forms/uploads/php/files/jmjv5na9bjoe8mqk84q5vjo5jr/zumujezexikofi.pdfIn PDF document text
    • https://samarpanbharat.org/trila/userfiles/file/tutebenirubutelaran.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/39f0d03d30cc2266d8f3f83be3809c45/xinune.pdfIn PDF document text
    • http://isystem.hu/userfiles/file/bedixusivitozanonomaw.pdfIn PDF document text
    • http://nghieuphong.com/upload/files/mavojozalujenidoda.pdfIn PDF document text
    • https://strechybenesov.cz/content/65663848193.pdfIn PDF document text
    • http://studioagm.it/userfiles/files/golesexakiwotoferewit.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210706015331.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/06dffb01417db29d56b70a79105ff348/migupupono.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/12557123794.pdfIn PDF document text
    • http://lamorenj.com/userfiles/files/somisolanekozegixixuf.pdfIn PDF document text
    • http://dent-pro.cz/pic/file/47924961916.pdfIn PDF document text
    • http://thepnguyentran.vn/media/ftp/file/94433553824.pdfIn PDF document text
    • http://sun-eko.eu/files/file/32265368709.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a94ac16026ad2592f2412cd6636a5d12/vunutul.pdfIn PDF document text
    • https://turismopontevedra.com/ckfinder/userfiles/files/kutax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=where+can+i+download+best+pdf+reader+for+androidPDF 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_off0000b626.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB626 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE3D 10936 bytes
SHA-256: 9ca1ad056b643257a725681671d12c7ff419f6310a7d3246afaba577e75d9bc9
font_02_sfnt_off0000e753.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE753 14472 bytes
SHA-256: 157c475cfdd8c956a9bad12ff21cf45e4d52d52de30fa3c634af082d7534ddc1

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