Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdd169f04053bfb8…

MALICIOUS

PDF

87.0 KB Created: 2021-09-18 22:20:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 481c11ec064880d69d7024b98f7e6921 SHA-1: 87c7f051baea0f67b6ca6ca8d3fef16050a06251 SHA-256: fdd169f04053bfb85b646210cb838cdc32f0f5d579e94cd66a6ecc956fd370be
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to disposable hosting or compromised CMS uploads, suggesting a link farm designed to redirect users to malicious sites. The embedded JavaScript stream and ClamAV detection further indicate malicious intent, likely for phishing or malware distribution. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9807

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.
  • 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 https://irlanc.ru/uplcv?utm_term=mod+farmville+2 PDF link annotation
    • http://erbamedica.org/userfiles/files/62650103178.pdfIn PDF document text
    • http://notariocprietoa.com/notaria/documentos/files/14356742523.pdfIn PDF document text
    • http://vitacanes.com/uploads/files/sijatinub.pdfIn PDF document text
    • http://yevres.fr/ckfinder/userfiles/files/mosodopokekifiwot.pdfIn PDF document text
    • http://www.pratikchoudhury.com/fckimages/file/xusetujubut.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612fec009289c---wamape.pdfIn PDF document text
    • http://atrsara.ir/resource/files/46321843168.pdfIn PDF document text
    • http://zhfangyuan.com/uploadfiles/files/50408337867.pdfIn PDF document text
    • http://www.rify.us/cms-uploads/files/donujiditiduganus.pdfIn PDF document text
    • http://www.heatandgas.com/EditorImages/file/63530451967.pdfIn PDF document text
    • http://brain-sh.tw/upload/file/nofanuxomatikenumo.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/9fc3a4e407507ae80be82c8e21422f6f/99548023918.pdfIn PDF document text
    • http://purepoem.com/resource/docContentImg/file/2021-09-18/43059706f4ac55523ed957cb45db60f3.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6f826d23f---dagorunanex.pdfIn PDF document text
    • https://sysyanginguvenlik.com/uploads/files/16552457688.pdfIn PDF document text
    • http://taiwanglassgroup.cn/userfiles/file/fofozo.pdfIn PDF document text
    • https://brukspec.pl/upload/file/26498560508.pdfIn PDF document text
    • http://vssteel1999.com/ckeditor/userfiles/files/peguz.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613df76a3c6e5---59502201202.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/e1b246662c0da61fb027e2ca9de0e900/61765528574.pdfIn PDF document text
    • http://sirinthepgroup.com/userfiles/file/5526919075.pdfIn PDF document text
    • https://airbays.com/userfiles/file/42391954392.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16138ec84123cf---rinonuparomotitok.pdfIn PDF document text
    • https://kuraniterbiye.com/resimler/files/30565480694.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/duredaxoxena.pdfIn PDF document text
    • https://grupo.iberia.com/js/ckfinder/userfiles/files/kikuwusisiz.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB2B 1868 bytes
SHA-256: 9d2bb2d94384256bb38bab4c3005c13f44a8b25eb5b232dcefe64ad24aae4b51
font_01_sfnt_off0000e3e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fbf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF4 22956 bytes
SHA-256: 33df1a01197e4af334e08ae0ab71394cd99e942dc70d13f6a8e646bcc6f33eef
font_03_sfnt_off0001365a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1365A 10324 bytes
SHA-256: 2f2241ae59e249d272fea867e3684bc011f30881660c4bb75ebac6d72708f07c

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