Malicious PDF — malware analysis report

Static analysis result for SHA-256 37a619b572c70e16…

MALICIOUS

PDF

75.7 KB Created: 2021-07-31 12:43:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5ddeebf9bc94e8b8dd7df79ec766a863 SHA-1: 2c19cec4fe4302ae47ea09d530537dcd7a6b30a2 SHA-256: 37a619b572c70e1680ca962d2f8f8b695d74671b2d7d2cf0e0825c43fdf6363d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs, many of which point to compromised or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely involving the execution of embedded scripts to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9939

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://donauwell.at/userfiles/file/zajukamerozapejid.pdf In PDF document text
    • https://luyenthitoeic.info/userfiles/file/jekusatirus.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/c64902b2c77ff6f127ed743ad889aad2/87911338920.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607008b02c380---79280317512.pdfIn PDF document text
    • http://tanabuauto.com/js/upload/files/11313515416.pdfIn PDF document text
    • https://o-dance.com/upload/files/33743478935.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021051521052373499.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/b1855f7126fa360a27df731922d0d8ff/wudenigexez.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/vibokoxegu.pdfIn PDF document text
    • https://psiakocky-potisk.cz/webpagebuilder/ckfinder/userfiles/files/sigate.pdfIn PDF document text
    • http://vivo-mebel.ru/upload/file/83456756311.pdfIn PDF document text
    • http://chromatographvials.com/d/files/nimenerevawaxafoxikaw.pdfIn PDF document text
    • http://solarexperten.ch/fckeditor/editor/images/file/durugus.pdfIn PDF document text
    • http://atya.eu/files/file/dabopijigevojuzagiji.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/6e02eb6c33313aba8496bcc4e438fec0/89001592327.pdfIn PDF document text
    • http://popnmusic.fr/userfiles/file/bamawojebese.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073762c47141---vevuwalobevatowonigovivoz.pdfIn PDF document text
    • http://allnatureint.com/userfiles/file/kuvukep.pdfIn PDF document text
    • https://happycolaborativo.com/uploads/files/36323653517.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d20b078c168---54155636660.pdfIn PDF document text
    • https://fanaf.com/article_ressources/file/93867396351.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/abdcd22f8c24b04f51ed3b5b999504f6/58976397451.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b684af78cdb---timevinifewajotirajonu.pdfIn PDF document text
    • http://airholic.com/UpFiles/WebEditorFiles/file/zewegofowibifelobefen.pdfIn PDF document text
    • https://hyundainhapkhau.vn/upload/files/tosigikajefi.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/fbb29877f12e6b963bc3032d3037e6f4/93991875130.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=hoja+de+seguridad+del+reactivo+de+tollensPDF 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_off0000c130.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC130 18108 bytes
SHA-256: 7a9037d32a9947fbe07e170151175339de6f5e90923255acb241f16c3c24df2d
font_01_sfnt_off0000efc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000107df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107DF 10832 bytes
SHA-256: 0863f121fe15bf98ed4931def5bf96a7f2c6079d2beb49611ba5dcf1c0a9a7dc