Malicious PDF — malware analysis report

Static analysis result for SHA-256 502d88b584c595e7…

MALICIOUS

PDF

71.8 KB Created: 2021-09-05 03:51:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e76a20798daa1f16e807e4a85a6e48e6 SHA-1: 35a158b3e052a8ed65d92adcc0cc87e9085b6814 SHA-256: 502d88b584c595e79cb4239c1e4e724049da28503c14a85df8d3f86347f5a734
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress upload directories, indicating a link farm designed to host or redirect to malicious content. The ClamAV detection and ML classifier further support its malicious nature, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a8315c25dca---vorinoxudexupisutemu.pdf In PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160771bfeab6bd---fobunavanamovugazudowiso.pdfIn PDF document text
    • https://razredna-nastava.net/files/zukirekudalotu.pdfIn PDF document text
    • http://nanopena.cz/upload/file/pulerufowewovat.pdfIn PDF document text
    • http://gpp300.fr/userfiles/file/26339570915.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/cab9143f758d33ff34b15f048dfa95e4/sodemebenotudanagin.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16117fde4ee9d5---nesunilaninu.pdfIn PDF document text
    • https://daiichitravel.com/uploads/news_file/kuxuwukenorukew.pdfIn PDF document text
    • http://langmypham.com/luutru/files/disivud.pdfIn PDF document text
    • https://agrimal.pl/userfiles/file/vetumupudopifotozu.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/a6e53c6ee50227dc7e2dcd54b7109c83/domaf.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/50947776820.pdfIn PDF document text
    • https://eminentland.com/admin/userfiles/files/rupek.pdfIn PDF document text
    • http://amghanoi.com/images/ckeditor/files/nolinifiruralog.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161061180455ac---zerituzidabifudepameb.pdfIn PDF document text
    • http://kesherisrael.com/uploadEditor/files/468092910.pdfIn PDF document text
    • http://eluvial.com/sites/all/sites/eluvial.com/files/20452310685.pdfIn PDF document text
    • http://jmestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/8205760425.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/37c5caebd15f91a4543cba5327bf5901/65444512853.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/9da2c4f7fb7054ecee6cbf33d530c53a/kazujixetajotiw.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/6f99a77c1ea30b284f9c7c9b0cb356c0/fibuga.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/eda8f20781c4c5bb47ae9f198eae0059/13231767813.pdfIn PDF document text
    • https://fasleh.net/Files/files/jovedejagevufem.pdfIn PDF document text
    • https://people11people.com/uploads/File/3202693993.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/37186259266.pdfIn PDF document text
    • https://aspirans.com/files/file/25226879309.pdfIn PDF document text
    • http://holzweiss.at/71808492061.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=crupe+viral+tratamento+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b807.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB807 10688 bytes
SHA-256: 70301a43f101d3c3a6a9e4b1707c89765a82432773aab7f3dcb6ad9988b25d12
font_01_sfnt_off0000d07d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD07D 16160 bytes
SHA-256: 17089a454d42da13e41079c8b8fe145ac985fcec34da9935e40ea5fd713c10a3
font_02_sfnt_off0000f97d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF97D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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