Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc9d62352892ddaf…

MALICIOUS

PDF

82.2 KB Created: 2021-09-04 21:46:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 839d946f55f1661c08f272e0f3233810 SHA-1: 2a7df58a42909c7efc870104abaee576ee6d4d68 SHA-256: fc9d62352892ddaf1e05aff0fa4577e2a9e91df999e043a0bb921261fcae674e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for malicious documents. It also contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the execution of JavaScript to redirect users or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://drafthe.ru/uplcv?utm_term=network+marketing+concept+pdf PDF link annotation
    • http://colafranceschi.it/userfiles/files/teratif.pdfIn PDF document text
    • http://fmi.lu/userfiles/files/nerokifapomurafalazezew.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/da5c9b8e86b236b0a6df73ccd12fcda2/82862572001.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086922c2b7c9---nonudoke.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/zemebuxa.pdfIn PDF document text
    • http://thcsnguyenvanhuyen.hoaiduc.edu.vn/ckfinder/userfiles/files/69724113003.pdfIn PDF document text
    • http://biotop-zamosc.pl/userfiles/file/55835341459.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/lojodugeravazikov.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/1e19bc563e143c459ed9fbf32f43cd0a/palarexowofo.pdfIn PDF document text
    • https://xtrafitcoaching.com/www/images/files/lazekuferofupobalosejugu.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/cbfm907ojtm9na018jp3u51oe9/72875975592.pdfIn PDF document text
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/wepelogu.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/8pmunss6nlpp8jk52hnm20mea6/30965160865.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b65202ea449---26583574641.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ac3375d3991---totinijolosufulekimobi.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bce99d95362---joverijegeziwemolagurel.pdfIn PDF document text
    • http://mousike.it/img_ins/files/89865619188.pdfIn PDF document text
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/52ucthq65brlp39lduaae5i95u/wobejoboju.pdfIn PDF document text
    • http://giasuthienphuc.com/Images_upload/files/minurevopatixazokinux.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/sloonj2avt2t4qsf3id6nra2r4/53924226961.pdfIn PDF document text
    • https://0900107678.com/upload/file/nadovenuxonujeziwofub.pdfIn PDF document text
    • https://vrindaindia.com/php/joseph/uploads/file/miwafixozugejimokifuzogi.pdfIn PDF document text
    • http://www.ville-civaux.fr/admin/js/ckfinder/userfiles/files/40112771223.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/d036ade15f28a565b686d5c68a26b5de/59361488740.pdfIn PDF document text
    • 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_off0000ddb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB6 17180 bytes
SHA-256: c056dc9cf75c99725181e38abd134ddba688cedd8be6b89cfcf8ea1a9e21e0dc
font_01_sfnt_off00010a0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012222.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12222 10904 bytes
SHA-256: 72672c695e08dd07bb98b7282a5c047ed7754686fcaa2c3c035f00e5afa23a91