Malicious PDF — malware analysis report

Static analysis result for SHA-256 0450a8d1c79873a1…

MALICIOUS

PDF

83.9 KB Created: 2021-09-15 12:25:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ba7219300bd2fceacc608f184e2b3d3a SHA-1: f9033b5720920a5ce690c3c4af64b5adf54293d0 SHA-256: 0450a8d1c79873a173c5e9ff25fde00561a0133c7dfa0c701cd78f4e75d5d4b8
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, suggesting a phishing or malware distribution scheme. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the nature of the URLs and the PDF structure points towards potential exploitation or redirection to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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 http://oilmachineydy.com/d/files/fuvobezosunid.pdf In PDF document text
    • http://www.ondebiz.com/userfiles/file/86364582979.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/161324c34422fa---48097573742.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/0fa57db0d77e78a8e9cc051978225874/rosiwaradewebavusekur.pdfIn PDF document text
    • http://sententtech.com/file_media/file_image/file/jekave.pdfIn PDF document text
    • http://kronospan-mofa-hungary.hu/editor_up/bidase.pdfIn PDF document text
    • http://mkconline.com/landmark/ckfinder/userfiles/files/32567557221.pdfIn PDF document text
    • http://urgentcarepb.com/userfiles/file/polowujerup.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16131ad1add4c9---nimonipewolasu.pdfIn PDF document text
    • http://dafangtour.com/fckeditor/userimages/file/tuvevapa.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/161380432e6d2f---lasuvolaxadozerizoj.pdfIn PDF document text
    • http://dangkydoanhnghiep.org/hinhanh_fckeditor/file/kodakibogezapovobem.pdfIn PDF document text
    • https://dallaslandscapedesign.com/media/files/mazakevigiketexeloxaweb.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/tumas.pdfIn PDF document text
    • https://ms01bet.net/contents/files/11101082586.pdfIn PDF document text
    • http://www.chp.pl/ckfinder/userfiles/files/pesopusiwakoxew.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/a2e2q1e70a4licfjeuh0riaa2e/48686365428.pdfIn PDF document text
    • http://viermaalh.nl/Bottesteyn/Site/afbeeldingen/file/diziwojepuladetugij.pdfIn PDF document text
    • https://obermeyer-modemarkt.de/upload/file/62690356910.pdfIn PDF document text
    • https://lenaoyunlar.com/calisma2/files/uploads/10844044977.pdfIn PDF document text
    • https://irish-setter-zucht.info/ckfinder/userfiles/files/90466980798.pdfIn PDF document text
    • https://gedayapi.com/userfiles/file/84636010553.pdfIn PDF document text
    • http://ninda.vn/userfiles/files/juxupunixufitut.pdfIn PDF document text
    • http://gilendor.cz/userfiles/file/tokiset.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/fd5c3a4e74bea139f4c3498be73cfb32/tiribotovumaxikagakugug.pdfIn PDF document text
    • https://songhong-thudo.com/img/files/61898791546.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=best+live+wallpapers+apkPDF 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_off0000e5f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F8 10320 bytes
SHA-256: b831da8c7272fafa68497fd28680de1445ec217b66f5ed86e9b64469e673a21f
font_01_sfnt_off0000fd7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011590.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11590 17076 bytes
SHA-256: de16a0818c826a91116fe82c6c1c83750b9478da0fcb0845ad2d23fcb9aac64b

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