Malicious PDF — malware analysis report

Static analysis result for SHA-256 aab318cd95cc2654…

MALICIOUS

PDF

68.9 KB Created: 2021-09-05 05:08:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2132955541c345ca4248fcf2cc7a06a6 SHA-1: 4b6e4dae5825c2f17673a44aa01a84f3500cda99 SHA-256: aab318cd95cc2654dd3e1caa564ea008dfc576e17a5b9ccbada35da6681c41d5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. It also features numerous external links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier further confirm its malicious nature, likely as a phishing or malware delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160960ae8d8198---4107159985.pdf In PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/mlmc7ociopnplsegkn661f43hf/mataxenobovizerodaf.pdfIn PDF document text
    • http://4appsoftware.it/file/78380521061.pdfIn PDF document text
    • http://personal.sut.ac.th/chantira/port/ckfinder/userfiles//files/22971216823.pdfIn PDF document text
    • http://autothudo.vn/upload/fck/file/sejitokupidiwibuxetudita.pdfIn PDF document text
    • https://wickedcheesy.com/images/file/muminoranajamawupigewa.pdfIn PDF document text
    • https://abisspaandboutique.com/nbloom/fckuploads/file/642057681.pdfIn PDF document text
    • http://nensi.si/upload/file/liturun.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/7173535136.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd97bae663d---96142310776.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0c75796ac---40264380758.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/3hh2u02htcuviulqfr584c2dhd/piromaziwutizam.pdfIn PDF document text
    • http://betheaskssd.com/flash/betheaskssd.com/file/pedonirilowivajaleri.pdfIn PDF document text
    • http://cnzhongkui.com/fckeditor/editor/filemanager/connectors/php/uploads/file/252036155893.pdfIn PDF document text
    • http://plovdivweek.com/app/templates/js/ckfinder/userfiles/files/69227528491.pdfIn PDF document text
    • http://youngthisyear.com/ckfinder/userfiles/files/xeboropurenofus.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613361c138353---busuxotilen.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b49b43f2b09---74914749160.pdfIn PDF document text
    • http://mamnonlittlesun.com/upload/files/zamatuwifiwaxopatamonabad.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16081bf5179e81---fegerufovujeb.pdfIn PDF document text
    • http://sterenstein.ru/userfiles/file/28153827173.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aefde8a16fb---28373486456.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/xilupoviwaju.pdfIn PDF document text
    • http://mtsskzy.com/userfiles/file/tuxasadewumozexamofutiji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=phpmailer+attachment+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_off0000b330.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB330 14016 bytes
SHA-256: 5192896a71825ddfbe2f3a2634404c55532a3414748d4212214939ccd881ff19
font_01_sfnt_off0000d638.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD638 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ee4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE4F 10600 bytes
SHA-256: cb9a41bf502fd7cb26838c6f781789827b47f2e40e631a206bc4575c33df09a1

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