Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c539287555576da…

MALICIOUS

PDF

99.9 KB Created: 2021-09-16 07:12:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e09e4355dc6ddabf63910bc0fcc58607 SHA-1: 8bc87e5456e22c7cc21c1f797a15f01252f62cdd SHA-256: 9c539287555576dac47a91d4c8cf210904481269da9341ee2a1ba24542fad0ca
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV also detecting it as a phishing trojan. It contains numerous external links, many hosted on compromised or disposable domains, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the nature of the heuristics indicate that the primary attack pattern involves directing users to malicious external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9875

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://crewmak.ru/uplcv?utm_term=download+mnml+screen+recorder PDF link annotation
    • http://automozg.by/upload/editor/files/girajotibitiroxefo.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/8605fe83ae239b86dfc233d7301b57ba/sovabusipuxujonab.pdfIn PDF document text
    • http://intranet.uts.edu.co/portal/app/ckfinder/userfiles/files/lotakusosagara.pdfIn PDF document text
    • https://kampusogrenciyurdu.com/file/ripovevusazofebovatove.pdfIn PDF document text
    • http://orthocarecentroortopedico.it/userfiles/files/30229304831.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/6b2cf39a4fcaf84a668c891c9e9080bd/xuxosa.pdfIn PDF document text
    • http://megat.pl/uploaded/fck_files/file/34003386691.pdfIn PDF document text
    • http://liceoadultos.juniorcollege.cl/userfiles/files/89908233783.pdfIn PDF document text
    • http://zhfangyuan.com/uploadfiles/files/91476208325.pdfIn PDF document text
    • http://jrmhandling.nl/upload/file/jorexafumukomasudag.pdfIn PDF document text
    • https://clubforeducation.com/FCKeditor/userfiles/file/30846128630.pdfIn PDF document text
    • https://www.newhorizonscrisiscenter.org/ckfinder/userfiles/files/sunekifakibiduga.pdfIn PDF document text
    • https://agermag.ro/mm/file/divafemi.pdfIn PDF document text
    • http://anquocrealty.com/uploads/image/files/felubaxejenagikobedaxobel.pdfIn PDF document text
    • http://viquadro.com/userfiles/files/vilewel.pdfIn PDF document text
    • http://emannsltd.com/userfiles/13701280668.pdfIn PDF document text
    • https://csn-alliance.com/data/files/6293821627.pdfIn PDF document text
    • http://boothbayharborshipyard.com/userfiles/file/basevedaruvexaturoxe.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/83635885673.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/ceed2504a16b27cf39e6b882e5e709b2/fuxus.pdfIn PDF document text
    • http://rsti.biz/files/fck/file/bikakidiri.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/kevenotinefulenexuxop.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/706275221.pdfIn PDF document text
    • https://badoza.net/userfiles/file/67392657312.pdfIn PDF document text
    • http://futsalcb.cz/picture/vtextu/file/58595840827.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16132c524d07d4---2931042343.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_off00011586.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11586 10428 bytes
SHA-256: 7b0596db9ef7395cd6a3c1199d717e59ef8fd54e518be8d38d1d9d5b89d05220
font_01_sfnt_off00012d33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014545.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14545 22800 bytes
SHA-256: 9f558355af6ff6903e9832a304700142a0f8897c772ff7fac30bd3f16cfd7145

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