Malicious PDF — malware analysis report

Static analysis result for SHA-256 b43437b69323bbc3…

MALICIOUS

PDF

75.5 KB Created: 2021-09-16 08:07:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2b24c0d69cc83c9ec80c4f1f3253200d SHA-1: b126de39df296573d4000697dabcc923656fd7ae SHA-256: b43437b69323bbc3bb7598eace8c20c17cf2508c416ed7d556742c273d3c9cf2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains embedded JavaScript and a large number of external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting an attempt to lure users to malicious sites. The presence of embedded JavaScript indicates a potential for further malicious actions, such as downloading additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://huntic.ru/uplcv?utm_term=como+localizar+un+telefono+android+robado PDF link annotation
    • http://kursadowicz.pl/Upload/file/moreta.pdfIn PDF document text
    • http://konyanincigkoftecisi.com/userfiles/file/35359768254.pdfIn PDF document text
    • http://ylplj.com/ckfinder/userfiles/files/widijer.pdfIn PDF document text
    • https://sunnyrosesschool.com/userfiles/file/wagoxeluw.pdfIn PDF document text
    • http://nakajima-ya.com/upload/save_image/files/pajeluvodiralegurekenowo.pdfIn PDF document text
    • http://dirpub.org/editor/ckfinder/userfiles/files/tugozapepofewazusogolaro.pdfIn PDF document text
    • https://medgal.pl/admin/ckfinder/userfiles/files/62973731191.pdfIn PDF document text
    • http://recepti.plovdivweek.com/js/ckfinder/userfiles/files/ginifaxitusur.pdfIn PDF document text
    • http://sherwoodchambergolf.org/ckfinder/userfiles/files/dajafodutiwisijularovuko.pdfIn PDF document text
    • https://tranduongauto.com/app/webroot/files/images/pages/files/57195488597.pdfIn PDF document text
    • http://suliaok.com/v15/Upload/file/20219102052236319.pdfIn PDF document text
    • http://margheritango.it/userfiles/file/zavuxewodowoxovidaf.pdfIn PDF document text
    • https://shirbandifelt.com/userfiles/file/sixifasipisevigabaxopupiz.pdfIn PDF document text
    • https://pr-dienst.ch/file/14451195587.pdfIn PDF document text
    • http://s-pack.kr/userfiles/file/20210908022849.pdfIn PDF document text
    • http://studiolauramoschini.it/userfiles/files/jupujazuzateterovofudinet.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/zupesenumuwujutuzifa.pdfIn PDF document text
    • https://ahirealty.in/admin/userfiles/files/vekogodibub.pdfIn PDF document text
    • http://mariancozma.com/_user/file/tusikebudusepopimolirofaf.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161342f051dc44---96563935580.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141474411cbf---gurededokejekavefawaxib.pdfIn PDF document text
    • http://sobinco.cz/ckfinder/userfiles/files/52858278376.pdfIn PDF document text
    • http://pastadimatteo.com/ckfinder/userfiles/files/fovosufaxoxu.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614234f987f13---minuxamebajesibulanu.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_off0000be05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE05 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d617.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD617 18864 bytes
SHA-256: 6f2a68b613637fa98dc20a6c0d87ceeb1455105c8c1b0773f744c40627e7fa54
font_02_sfnt_off000105c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C6 10800 bytes
SHA-256: 30208644f63dd49e5c9d4a1708dd5265790b2bb6d11343711792f4909064da18

Open this report in the interactive analyzer, or submit your own file for analysis.