Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbaab7dd47348a2f…

MALICIOUS

PDF

77.3 KB Created: 2021-09-08 03:52:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1fb1a408a86ea9cac0f87a3f6de45036 SHA-1: 7231e0c3371508e12be4894e52b2f7e1063705d0 SHA-256: cbaab7dd47348a2fed0a479c0710575fe8248c74c1e94a4b1567046f82d7608a
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the URLs and the PDF structure point towards a malicious document designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://www.scsi.coop/wp-content/plugins/super-forms/uploads/php/files/000fedd2054c1d199bce82ced3c98f50/saxiporilejajuruzemapejem.pdf In PDF document text
    • http://pathtojanna.com/userfiles/files/dasedafekixerodufujo.pdfIn PDF document text
    • https://phoenixturkey.com/upload/ckfinder/files/50309514222.pdfIn PDF document text
    • http://helderlive.nl/ckfinder/userfiles/files/29706795311.pdfIn PDF document text
    • http://fge-service.com/userfiles/file/retax.pdfIn PDF document text
    • http://itkaufmann.com/images/fckimages/file/41342119888.pdfIn PDF document text
    • http://yaan121.com/uploads/files/202108190009115269.pdfIn PDF document text
    • http://zonwering-belgie.nl/ckfinder/userfiles/files/26765184001.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa8053b009---22634707808.pdfIn PDF document text
    • http://odessawa.com/userfiles/file/15169750827.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbba07d0d5---22057598133.pdfIn PDF document text
    • http://dansensvenner.dk/imagesfile///mejavanuxifizanekenubuwox.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/a6rpsdrjd3q1lnmbe2g1ei09vo/kuzumumidafagipitisota.pdfIn PDF document text
    • http://trips-in.com/ckupload/files/vodefejoxukaximil.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/52936269578.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/72ku9lfnf4mkl5cq19dljqsdg6/79394518074.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/snmuo8f993tvkd6et2na9rag65/98375513693.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/12493528178.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/kji2hclrnh0k2plb1kqqb53sch/4801222571.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/150a5c45448ed47840935fb265f16e3f/koladebuta.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/kinokusapalujagariw.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1611545997b84e---lamexamevi.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee737e4c55---vobilowilagonogiwoseju.pdfIn PDF document text
    • http://anpo.vn/upload/files/89251285140.pdfIn PDF document text
    • https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/92542cc49b2fc26ab2a7924a13c86b11/81131039071.pdfIn PDF document text
    • http://intrinhgia.com/admin/webroot/upload/image/files/mivosegizizuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=just+basic+programming+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_off0000cb29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB29 16552 bytes
SHA-256: 304850df97e5e9883b470a28632ceffba2189dbb012afc774003f2723d7719c1
font_01_sfnt_off0000f5d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D8 11016 bytes
SHA-256: 646df24db7bd1dfe9e4d6ace2b53146269def9b94b735c0ab5d4caa8b0a91639
font_02_sfnt_off00010f14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1