Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc02800ea24d9ef7…

MALICIOUS

PDF

69.4 KB Created: 2021-09-25 06:05:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: ea06a213ff9b164e5faec0c7ffe2fca9 SHA-1: cf683a2abcaf83af7891af83ab296900f16ac79b SHA-256: bc02800ea24d9ef777b2eb2a4b610bbb93127f374adf52a548746366c552a3b7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to potentially compromised websites, as indicated by the 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded URLs likely serve as lures to phishing sites or downloaders for further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • 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://hkfew.org.hk/ckfinder/userfiles/files/jasajufisamomumoteve.pdf In PDF document text
    • https://prokoncept.hu/admin/blogfck/image/file/91443178587.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/a45d4fb69f761172813fb32e3edcbe88/wazexiro.pdfIn PDF document text
    • https://suthuytinh.com/app/webroot/uploads/files/gatexodovas.pdfIn PDF document text
    • http://ediljolli.com/userfiles/files/11020136648.pdfIn PDF document text
    • https://adikkedua.com/contents/files/bukaxenedikemixefi.pdfIn PDF document text
    • http://sieuthibongda.net/ckfinder/userfiles/files/turesuvatetosi.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/161341a0c46ec0---jalovubinonogubuzotamali.pdfIn PDF document text
    • https://adtw1.elfjane.com/ckfinder/userfiles/files/banolopabulik.pdfIn PDF document text
    • http://nikolalepojevic5.com/multimedia/file/musisopejosuxalolajosezab.pdfIn PDF document text
    • http://veterky.ru/ckfinder/userfiles/files/gupekasami.pdfIn PDF document text
    • https://www.ksmt.edu.np/assets/ckfinder/userfiles/files/jafanula.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/2945002501.pdfIn PDF document text
    • http://markjfox.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/55689036765.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/5b58f2c6a31522c80393be9f4dbdadae/11356061014.pdfIn PDF document text
    • http://starma.pl/files/file/26324071804.pdfIn PDF document text
    • http://pjzhengwang.com/upload/file/20210909_120352_183.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/xotanaponufoliwerarulolu.pdfIn PDF document text
    • http://rracc.com/file_media/file_image/file/banamixedexetopo.pdfIn PDF document text
    • http://sziazsauto.com/uploads/files/46612600240.pdfIn PDF document text
    • http://kamerton.nl/clientfiles/kepobiruvi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=samsung+vs+android+tvPDF 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_off0000adc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADC1 16820 bytes
SHA-256: 94d0a66c7782d8c572fd92019e4da6accd339d556d448fef3469ba214ab89aec
font_01_sfnt_off0000d842.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD842 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f059.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF059 10652 bytes
SHA-256: b2c534d78fbd749b61503fbaa11c20275e3acd5b6b1e6c1d4f49e94d43bbc72f