Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd728767663ed4d0…

MALICIOUS

PDF

83.1 KB Created: 2021-09-17 11:05:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d9299234850b1d412145b77b87efc1ee SHA-1: 02a39304a6664dc23cd99988d8a5b04555291f46 SHA-256: bd728767663ed4d0e9f344174ee55e2c8bccdb59dba8a54ef8110887acc6197f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to compromised websites, suggesting a link farm designed to host or redirect to malicious content. The presence of a 'download button' heuristic further supports the idea that this document is intended to trick users into downloading further malicious files. ClamAV detection as 'Pdf.Phishing.Trojan' confirms its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613e0420b9574---wuwujoridazupenodubaluz.pdf In PDF document text
    • https://braintreeclinics.com/app/webroot/img/files/lunoso.pdfIn PDF document text
    • http://scard.vn/app/webroot/uploads/files/22645820303.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/39075673099.pdfIn PDF document text
    • http://pegasomeeting.medcoast.net/ckfinder/userfiles/files/74563344506.pdfIn PDF document text
    • https://xetnghiemadndanang.com/upload/userfiles/files/6309086661.pdfIn PDF document text
    • http://abwingscolley.com/uploads/files/37166905743.pdfIn PDF document text
    • http://www.aunay-sous-auneau.fr/ckfinder/userfiles/files/dugirobikikopogoved.pdfIn PDF document text
    • http://stilna-ya.com/_userfiles/file/48985999062.pdfIn PDF document text
    • http://hotstamping.pl/files/file/19923870866.pdfIn PDF document text
    • https://excore.hu/ckfinder/userfiles/files/96475294916.pdfIn PDF document text
    • http://synfarm.com/upload/files/58462801473.pdfIn PDF document text
    • http://aj-freight.com/ckfinder/userfiles/files/bekenolugetopufivosu.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/50393086f958871ed2610dd4adc341b6/vulomupemariwojotup.pdfIn PDF document text
    • http://ecompletecontact.com/ckfinder/userfiles/files/79787661132.pdfIn PDF document text
    • http://tehpromyar.ru/media/file/xopizogomimugezoxonewo.pdfIn PDF document text
    • https://viveironativodevicosa.com.br/ckfinder/userfiles/files/76611689976.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd7937050f---43001865168.pdfIn PDF document text
    • https://cometsecurity.in/admin/userfiles/file/45812060515.pdfIn PDF document text
    • https://saunadlaciebie.pl/userfiles/file/23001878641.pdfIn PDF document text
    • https://elemental-ia.com/userfiles/file/33735642666.pdfIn PDF document text
    • http://scuderieverdina.it/scuderia/userfiles/file/mojafotizoliwufiborisa.pdfIn PDF document text
    • https://sadex.pl/fck/file/saduwazixuvutafanexidurim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=master+tamil+movie+online+watch+freePDF 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_off0000df24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF24 10748 bytes
SHA-256: cc27e0ee60d544af63681a38abd82edfd71f15837673e93e39f039c38c2afeaf
font_01_sfnt_off0000f7bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7BC 18088 bytes
SHA-256: e96c2606bdeec8d6bc4cca9098404080d6299c0564354d692ecda3bf7429a92e
font_02_sfnt_off0001268c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1268C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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