Malicious PDF — malware analysis report

Static analysis result for SHA-256 6be193fd1eb3647f…

MALICIOUS

PDF

81.6 KB Created: 2021-09-06 22:52:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6b5dfffdf27c2090db4a793efced101c SHA-1: 1c61962ed15e40abaa17acff741741d6694b4254 SHA-256: 6be193fd1eb3647fbc17cf5cfa6c3f1c599ef752fb5f0da76b943ef627660e1b
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous links, many pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The presence of multiple external URIs and link farm heuristics strongly indicates a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://migger.dk/userimages/file/45706399119.pdf In PDF document text
    • http://klick-tipp.at/ckfinder/userfiles/publics/files/91801485384.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/0e6a389bb009ff51e35fbb08cd2bd534/boziguzifemi.pdfIn PDF document text
    • http://ljjxmining.com/uploadfile/file///2021090413153716.pdfIn PDF document text
    • http://www.integra-cr.cz/administrace/ckfinder/userfiles/files/99652292216.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///20215296355455.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/7af9d8d47acf279ed3fb16cbb44382f5/jixusewuwol.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/6901056498.pdfIn PDF document text
    • https://sabunwangi.com/contents/files/poboseziborujuzu.pdfIn PDF document text
    • http://inbeeldt.nl/userfiles/file/xuzizibiborut.pdfIn PDF document text
    • https://bandotrading.com/uploads/file/93338575785.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/97a613c02d3a9bd39a5dfb422e6564ef/pituponexopanufib.pdfIn PDF document text
    • https://principesgs.com/userfiles/file/zazelilimukunolugebotil.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/dotonoxelu.pdfIn PDF document text
    • http://hrjok.com/uploadfile/file/42174809750.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/43108516317.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb78c6c8dd8---27939744339.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/b7b40432887d58b57e1076da415fed55/55746284165.pdfIn PDF document text
    • http://konferencii.org/web/uploads/assets/file/66168451120.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609c81300c3c9---87464109401.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075614ab2a00---733450606.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078e003147ec---13141517346.pdfIn PDF document text
    • http://patanamachine.com/imgUpload/files/40111679276.pdfIn PDF document text
    • https://muahohangnhat.com/app/webroot/uploads/files/wuvipedevuwasu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=development+plan+2034+pdfPDF 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_off0000dc9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC9A 10860 bytes
SHA-256: d13640c8913484be08e542cea5a61408731642b311ad47404290dac5f72ee2b5
font_01_sfnt_off0000f5c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C1 17144 bytes
SHA-256: 6ba6b0d385ad07c8800bafec080b6749e4dc646e53e12f995bc6a098f69f46af
font_02_sfnt_off000120d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1