Malicious PDF — malware analysis report

Static analysis result for SHA-256 c118f29c8eee23bd…

MALICIOUS

PDF

124.6 KB Created: 2021-08-29 23:18:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 73c5760150a891bd6953f2b942c77e46 SHA-1: e2089a57e192a3129c99e619e1f59838a8ced05f SHA-256: c118f29c8eee23bd403f02053445ca0322a0f779493ad307fe5be21cc0b6e571
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF containing embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities. The heuristics indicate the PDF contains a link farm pointing to compromised WordPress upload storage, suggesting an attempt to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://gianniarnaudo.com/userfiles/files/temuveterarubebegotufowi.pdf In PDF document text
    • https://aduanaldelvalle.com/userfiles/file/28247737648.pdfIn PDF document text
    • http://salinahighschool1967.com/clients/c/c9/c9c88be04994199279bceb128c91314f/File/77155801465.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/7k7aduvstqj26ak6viaffqaafa/korotodojodimekunewav.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/qke2juiekjevq3qgiu52sfov7u/wabarexizidowopa.pdfIn PDF document text
    • http://xsjprinter.com/d/files/gidonutezu.pdfIn PDF document text
    • https://thinkglobalcompliance.com/ckfinder/userfiles/files/tojizugijekekuj.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb48b8d0b3---nenofelofizemagutaxu.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/61b261510ad33cffa4037b378525ebbf/92517687023.pdfIn PDF document text
    • https://mides.vn/images/ckeditor/files/47552181428.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f293666426---sozijagax.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c69e69a487a---pupatisefojakabababumo.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/161006d137a4f6---tobaxosixabemujubaledubej.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/38776754549.pdfIn PDF document text
    • https://pediatricpotentialsnj.com/PP/PPpng/files/55903288631.pdfIn PDF document text
    • http://ubest.ru/images/file/fugomewapetefaneme.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4e2c9744a4---zoferakux.pdfIn PDF document text
    • http://gaishachuukobuhin.com/js/upload/files/puxarovobuzuso.pdfIn PDF document text
    • https://thehouseconcert.com/ckfinder/userfiles/files/mukodesigopoz.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b57fc065a95---11849709461.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/87b1aaaafdf6427af45a79599a1591d7/51107354807.pdfIn PDF document text
    • http://gsemilia.it/userfiles/files/57337224361.pdfIn PDF document text
    • http://xlsferrosilicon.com/d/files/gomusuwopob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=and+god+said+i+will+send+it+without+wingsPDF 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_off000178a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x178A6 10596 bytes
SHA-256: 3cbcfbe6ca7cefddd71ab6a653f1cbf59d1eb55184f8e6cf792ffb3c597fc1ff
font_01_sfnt_off000190b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x190B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001a8c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A8C5 22724 bytes
SHA-256: 35bfdc28d796a5c9d20067ac10b10f8c04e5c15fbd776fb12fbe5efe9ddd1939

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