Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cfa2db68f52a07e…

MALICIOUS

PDF

83.2 KB Created: 2021-09-07 21:03:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3ea787dccb42c9795325ddd63067f670 SHA-1: c77e7f3fdd10bca1650cdafab36ce3fd846b3eed SHA-256: 9cfa2db68f52a07ee08011a876b98a5966edd4fba2d13c0187f4c3f6d76cf031
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting an attempt to distribute malicious content or phish users. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://ehotelgateway.com/bot/ckfinder/uf/files/55151499818.pdf In PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1608255411a7ab---kivobidu.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c5a1e80646f---85611846432.pdfIn PDF document text
    • https://guruamardaspublicschool.com/userfiles/files/runipigilog.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160753555454e2---33908526180.pdfIn PDF document text
    • https://bulgariapools.com/contents//files/84344418991.pdfIn PDF document text
    • http://cuanhuadanang.vn/uploads/image/files/somade.pdfIn PDF document text
    • http://essiac.cz/UserFiles/file/zajurolatedewenegosiv.pdfIn PDF document text
    • http://zonweringnederland.com/ckfinder/userfiles/files/sovitizexeniwoseza.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16094521ed5c8f---xoxinumanamarodene.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/57fde1c6cf1218ae07ad4a94e7aff00e/55293388126.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085c7fb0eadb---toduronupetigifunode.pdfIn PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/a40b3a47d65b0b84691151ab3622b9c0/32941654504.pdfIn PDF document text
    • http://doo-san.com/userfiles/file/20210620031940.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/323b65a5dc7e76ae8d42712946b287b2/23175679287.pdfIn PDF document text
    • https://ifbscalidad.eus/files/galeria/files/56915659986.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070146344aba---gumevapeluf.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/849323949d33ebc25f479700e996729f/94034083160.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/847846dbd3b580fa0d93da51ff34e7d6/38854337695.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/f4a96d0814c1081dd1ab9dad34b8f0ac/xomexenosi.pdfIn PDF document text
    • http://centralgiving.com/media/userfiles/file/21898968937.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/38481414526.pdfIn PDF document text
    • https://valleyrentals.com/userfiles/file/30278041183.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=quantifiers+grammar+explanation+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_off0000db9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB9A 11100 bytes
SHA-256: 8913be80835bdbf8763f8b9f0e1cdb42a8bb6814fc8b3f76ed29c893f2f108a9
font_01_sfnt_off0000f561.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF561 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D73 19420 bytes
SHA-256: 903f32ac279916fb31d20813f1954d6b4c4f5c5750a04154652b9deae1b021ce

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