Malicious PDF — malware analysis report

Static analysis result for SHA-256 b73e7b833ec4ee10…

MALICIOUS

PDF

87.0 KB Created: 2021-09-04 05:14:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ce9b8ea0ff994ddd718791fd841a794d SHA-1: 8f1ab8b0b89be1fcf184f062eca65de3975c0dc9 SHA-256: b73e7b833ec4ee10260bf2d717d3bed13dee1dc7a330049813b1d37a52e7b997
164 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, with high confidence. It contains embedded JavaScript and a large number of external URIs, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm designed to redirect users. The primary purpose appears to be directing users to potentially malicious or phishing websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 https://irlanc.ru/uplcv?utm_term=tipos+de+tuberculose+pulmonar+pdf PDF link annotation
    • http://curry-box-deluxe.de/userfiles/file/63233897567.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/2ec4185a206f67689f9019913e8313c8/gepogetevupurujukabiriji.pdfIn PDF document text
    • http://kanizsakran.hu/userfiles/file/62416351637.pdfIn PDF document text
    • http://novosib-sport.ru/ckfinder/userfiles/files/wuwowupofuno.pdfIn PDF document text
    • http://karate-talence.com/newsite/userfiles/files/joseguxovazibimito.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9b86f1c96---gomuxijadatifubo.pdfIn PDF document text
    • http://wecans.net/_UploadFile/Images/file/29735480452.pdfIn PDF document text
    • http://dataprint.ie/uploads/file/80788148905.pdfIn PDF document text
    • https://dwitunggaljaya.com/sitefiles/file/zipubavor.pdfIn PDF document text
    • https://careersourcechipola.com/files/public/nodozovewogobuj.pdfIn PDF document text
    • http://royalrep.com/userfiles/files/volujovusok.pdfIn PDF document text
    • http://zhfangyuan.com/uploadfiles/files/lejesakovuko.pdfIn PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/led2geh3inj1s0noa7sn2t0dk5/44572956179.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca783f2c92---42776467186.pdfIn PDF document text
    • https://soyana.de/js/ckfinder/userfiles/files/govutawimudo.pdfIn PDF document text
    • http://etenindex.nl/images/uploads/82508848418.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/pkhlu7ufb0kpiovt8e6kugqhj7/60561162460.pdfIn PDF document text
    • http://websteravelandscaping.com/editorData/file/17867603244.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/73049605743.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210801041338.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/2f03ef32563e0107cd251edfbacab9c9/21189245311.pdfIn PDF document text
    • http://hanasushichoice.com/uploads/files/xalowaduvubadonazinevu.pdfIn PDF document text
    • http://swaminarayangm.org/userfiles/file/fatupoxi.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_off0000ea7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA7A 10984 bytes
SHA-256: 7590a2f6953bd25af6b42245bd6ef623c48af9c145c9b9340c40e42c256e224c
font_01_sfnt_off000103bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011bd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BD1 19276 bytes
SHA-256: 143275739f483dc440a969b069ea1ee260004b3de8ad3a7bc990d245ede54628

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