Malicious PDF — malware analysis report

Static analysis result for SHA-256 94466ddfd72f6b33…

MALICIOUS

PDF

140.0 KB Created: 2021-08-14 18:36:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 6eb4694948b0e59be15f45f7bdf2d6f0 SHA-1: a4358a12172226957c0ec8156d06f2bb638b4cf4 SHA-256: 94466ddfd72f6b33c9493ee9589e69a2a1402a311f8d8c2aebb146e9b29c5373
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to distribute further malicious content or phish users. The presence of external URIs and a link farm on disposable hosting further supports this. No scripts were extracted, but the PDF structure and numerous URLs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9781

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://www.thaiboat.net/image/upload/File/17915554324.pdf In PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b087fab3da1---lewivirapinilijosupeto.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083dba9c86dd---37541353986.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b97421a388---lamabifufonerimo.pdfIn PDF document text
    • https://nikoljski.com/ckfinder/userfiles/files/tomadipugefamawilajew.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/73400548287.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c6f7853b672---rotus.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab1bc14634---88052159429.pdfIn PDF document text
    • http://bennyhigh73.com/clients/3/33/33ce00c6a031cf3b17a3dcf69aaa7594/File/98610846053.pdfIn PDF document text
    • http://kemmurad.com/webroot/img/files/81815162259.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/guluxufedufo.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b345c1995---bekapukujofakovosilapuxo.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/39222203052.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3a8d702163be687660c8dbab5ad82868/99040192694.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160806e5319e0b---senup.pdfIn PDF document text
    • http://weymouthhighschool1960.com/clients/9/96/9679770cb43d952edac6f872f7aef95c/File/52628665623.pdfIn PDF document text
    • https://vannordenvastgoed.nl/userfiles/file/37372566894.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/51b258f96a083e2f142e5742dfdfc17c/30277891129.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/74915979847.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/1927dc3bad318135c5b637057283afb1/sasosivowujip.pdfIn PDF document text
    • http://cementfeet.com/userfiles/file/webenatose.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/ce7cfcf17eb65c1878c647e3006c1d1b/pamonilusawujix.pdfIn PDF document text
    • http://aliglobshop.com/userfiles/file/70407746031.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=mainstays+heritage+3+shelf+bookcase+instructionsPDF 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
font_00_sfnt_off0001a613.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A613 11224 bytes
SHA-256: dd9f4f2f804af0470ba0f68d9b1bef60ea11b105b8546c24221c6f3049eedcc3
font_01_sfnt_off0001c06d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C06D 16140 bytes
SHA-256: 00b1f632e8afe72716c8bcdb76b7901b56c060d1dc0f96f3f5c1b8373b85735b
font_02_sfnt_off0001d5e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D5E5 19372 bytes
SHA-256: ab9f3b995008bcb5278e8b91964e60a1613061153577cf2870503b8383a3196c
font_03_sfnt_off00020933.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20933 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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