Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc9aade7b20fe0be…

MALICIOUS

PDF

91.6 KB Created: 2021-09-02 21:20:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e7d05a88582f52b997cdda48f0300b15 SHA-1: 9b4938ad5ae39d7cf159dadc8b0142c6f8c05d05 SHA-256: cc9aade7b20fe0bed7ca12e1b6a874b41fca26620f69d08bbc732cf0117c4145
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to redirect users to malicious websites or download further payloads. Several heuristics indicate the PDF is part of a link farm hosted on potentially compromised or disposable domains, suggesting a phishing or malware distribution scheme. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9765

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160f8633dd1e43---71860826829.pdf In PDF document text
    • http://sun-marche.com/app/webroot/js/ckfinder/userfiles/files/6254459282.pdfIn PDF document text
    • http://www.samuitns.com/image/upload/File/lulonixudesudevirefale.pdfIn PDF document text
    • http://katyababash.com/images/uploads/file/41998246833.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/4cce646dbb0115e75e7f7fb5516b6001/96377383826.pdfIn PDF document text
    • http://lulanjina.net/upload/files/matozufasatizolabopog.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160c60bcc0a1b6---potejejipukazu.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/gowigava.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/4f77lnqnoouis29l0qn1d5902r/geletinesadevixaf.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/30580cfa68ddc6cedc305cb0935e7e33/33761579850.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-24/20210524215010575442.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4358c001f1---zavunimixuvilazoda.pdfIn PDF document text
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/145e85d8d0cc2ff166b2edb1f6fe6666/20826644860.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/2021510220527926.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160942718104cd---witesoxubebememotutonaz.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/277ecc30e9fadf3fe200712ee1ca47ad/43286103629.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/79366be39f9caee710212010b030f3af/sidaleles.pdfIn PDF document text
    • https://okazionche.com/files/35045078656.pdfIn PDF document text
    • http://reikihaus.com/clients/75291/File/fofekifimawoxola.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/37012280379.pdfIn PDF document text
    • https://xuantruongtech.com/images/ckeditor/files/guwege.pdfIn PDF document text
    • http://bagliodeimille.it/userfiles/files/40085959184.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160a34e7b1f2d8---20001970326.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/b4d2db65f7b5d2acc003bde60d412736/vofamadelefeva.pdfIn PDF document text
    • http://perchegouet.com/ckfinder/userfiles/files/difuwapukawemagib.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/nazosobezusibasomomusudof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=demonology+and+witchcraft+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000fb65.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xFB65 18592 bytes
SHA-256: 8cd231ffcbebbec642514ccf78428d464e138e662b3e1f56dbec316eb9ab3635
font_00_sfnt_off0000e354.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE354 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011914.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11914 11100 bytes
SHA-256: 1acaf61b27b70f330a1823a66de9c3e2b26ce569414428e9b8f4162adf390f5f
font_03_sfnt_off00013297.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13297 17536 bytes
SHA-256: c80d5af29347642e7b229d7bc06f415f28a2206b7e25068c2f01d603bf142d6b

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