Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed8ddbd47599c7f5…

MALICIOUS

PDF

80.1 KB Created: 2021-08-26 19:59:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d08e7d89ac20b826111ee2ba6a57e4d3 SHA-1: 1fb771ad69149eb5e723c73ce2e9522046f3d711 SHA-256: ed8ddbd47599c7f5fba71208691c37a35fa91e142385b0b3fd93384e3926bf1b
172 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised or disposable hosting, forming a link farm designed to trick users into downloading files. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The presence of embedded JavaScript, though not directly executed in this static analysis, further supports the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ozanatalan.com/iboard/includes/userfiles/files/fogusanemasebupineju.pdf In PDF document text
    • http://profesniprukaz.cz/ckfinder/userfiles/files/wasomisewisekizedaxuw.pdfIn PDF document text
    • http://daieimotors.com/js/upload/files/gisatuvasajuwub.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160baf385b9744---sirivufagazovo.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/5l9ffoaojf1m73143m05dq3do4/zawodododelara.pdfIn PDF document text
    • https://ukmalayalamnews.com/userfiles/file/jujegowasopunot.pdfIn PDF document text
    • http://nnrhc.com/clients/9/98/980d61ede38c9a35fe3396fb65651545/File/93843404088.pdfIn PDF document text
    • http://albertopizzetti.it/userfiles/files/kojuvepabemiwinuvuzumu.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/d9968f43da8bc4accdfc7d4ccc1b19b8/66746304506.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/b2c7ac43905282462566cac04e22c2df/28513450890.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd2156bab1f---gesegugomazo.pdfIn PDF document text
    • http://dynamicyunnan.com/ckfinder/userfiles/files/rodavekog.pdfIn PDF document text
    • http://asclyziarskyklub.sk/userfiles/file/toxilolaxagebazixo.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160844d5ce08a4---56391812011.pdfIn PDF document text
    • http://mamnonlittlesun.com/upload/files/wofanow.pdfIn PDF document text
    • http://frappsreagent.com/upload/files/1768852518.pdfIn PDF document text
    • https://privatecambodiatour.com/userfiles/file/jujitujenulinijemu.pdfIn PDF document text
    • http://stroytehcentr.ru/images/file/40154584066.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083d5aeb52df---velurujajonomiw.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160828d03752a5---juvixiv.pdfIn PDF document text
    • https://hamzsabegi60szallo.hu/UserFiles/File/12257357544.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/ac757e458ab75600f46fb635d986408b/diwedogogexirofowerupefem.pdfIn PDF document text
    • http://tainghe.vn/userfiles/file/74898722030.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609166243fcb7---pedobiku.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16121b19ae2723---23356628570.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=electricity+and+magnetism+book+pdf+downloadPDF 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_off0000d2e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2E4 11380 bytes
SHA-256: 0137f725cbd39c210e85e26125f441f2c478ef507a11939490ec9ee3b3848169
font_01_sfnt_off0000ed51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010563.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10563 16852 bytes
SHA-256: ce1a1d67dc5b303058888122abc50b7a2923609855baa795a0ce62f11ad22ab8

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