Malicious PDF — malware analysis report

Static analysis result for SHA-256 2df9dff26ebc089c…

MALICIOUS

PDF

75.5 KB Created: 2021-09-02 05:13:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 850e597048788b727c5d88ba46c7d204 SHA-1: 012c416c85a95fc99d64f5d251358460a531a24d SHA-256: 2df9dff26ebc089c37179158f08ac6b93d31e20cea949bb5682596e68fb72232
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to distribute further malware or engage in phishing. The embedded JavaScript is a common method for exploiting PDF reader vulnerabilities or initiating malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://innotack.com/userfiles/files/9938264138.pdf In PDF document text
    • http://adria-ex.com/images/blog//file/libuvozi.pdfIn PDF document text
    • https://sportsht.com/userfiles/file/jubetepif.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/27673509683.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/25746544954.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16091d712a29a9---88501138385.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d483efe6252---feketepimujarixozadedul.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/a6850aef258128fe77b213d533ab1b7c/nujofomotogogazu.pdfIn PDF document text
    • https://jesssmithtri.com/jesssmith/ckfinder/userfiles/files/29858174483.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/4e55dc015bd1bc22804f27a5cdbd62c6/viwilavomamipeju.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c51c4b3dc90---67385205632.pdfIn PDF document text
    • http://paradisoseminatrici.it/userfiles/files/78907753678.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/wajotuxazorujemeb.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075982580389---konewifovawomisaduko.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a42c43a3617---raxumonumipeliwakogide.pdfIn PDF document text
    • https://weddingitaly.jp/images/file/digosidobasevag.pdfIn PDF document text
    • http://pokemom2.com/uploads/files/18481047280.pdfIn PDF document text
    • http://balie.overeembv-profielen.nl/upload/files/wetodowotosajopovipapivab.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/11aqm1oraolvdf4ifl7k5bb53b/fezivafeve.pdfIn PDF document text
    • http://karpatskiles.ru/store/files/dizotepesok.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/0b4de618efcd8111a185063234427660/44613266188.pdfIn PDF document text
    • http://attep.com/home/sandbox/domains/heekee.com.hk/public_html/ckfinder/userfiles/files/28616794185.pdfIn PDF document text
    • http://abwingsjanaf.com/uploads/files/vagorubewabotusamekude.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/lujakojepo.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/d62882dcc95d5c0725c9e911be40901c/jubewoponafaro.pdfIn PDF document text
    • http://kingsauto-bar.com/js/upload/files/kademofalojujezuni.pdfIn PDF document text
    • http://indigobaby.eu/upload/files/35691456463.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=ali+babar+and+the+40+thievesPDF 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_off0000c688.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC688 10612 bytes
SHA-256: 3a9e4e4236c2c444c63a3cb6459f50933aea6e75aedd501547413c79bf033363
font_01_sfnt_off0000dec5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC5 15796 bytes
SHA-256: f6c12544a1399b9969143fe0c7edf27a61078617ef151a2c1d9a26c98f455269
font_02_sfnt_off000106fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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