Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9cddbe0016a70cf…

MALICIOUS

PDF

84.6 KB Created: 2021-08-15 17:10:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b238d92271d6b004f67667ce6d3b0d33 SHA-1: 9cac0092148e61325f29dc85ae098e89e08d4751 SHA-256: d9cddbe0016a70cff59767f604defe960e7f5852bb698161340f2b6d478194ac
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The presence of numerous links pointing to compromised WordPress sites and disposable hosting suggests a link farm designed to host and distribute malware. The document body, though heavily obfuscated, likely contains lures to trick users into downloading the payload hosted at these URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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.
  • 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://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/q45toqniat8k8tsalfbca7f1r3/jewodiveruguwebovakiwuxe.pdf In PDF document text
    • https://hinodanang.com/uploads/image/files/67381171918.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/a6c0cd72edf252016853e6d5a0b19f3c/kitirepetazumajiwiriwuv.pdfIn PDF document text
    • http://resheto.ru/users_images//fck/file/78047634752.pdfIn PDF document text
    • http://slenderclub.cz/ckfinder/userfiles/files/bemaxasinuxowerupomilajo.pdfIn PDF document text
    • http://color-gateway.com/userfiles/file/72700525752.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/3b9a1e8fe2680595bda586d34091ed81/tenasuwu.pdfIn PDF document text
    • http://thietbidienmpe.net/upload/files/dapikogeverunekiwu.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/42b477fc5424b3d8abb4d15dcc66b1d7/8144428583.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/voxivefiwilukigajuxifito.pdfIn PDF document text
    • http://trans-serwis.com/userfiles/file/85607687851.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/cadb42982c2d71bc17ac1fa2a3fe8901/dodukugoma.pdfIn PDF document text
    • https://calmoinc.com/upload/editor/file/nekusaduvelawimudovefu.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1610305a75c96b---8436025.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086859066d63---87317993130.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/79239285788.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/s84cteaq2ebm8f8iu61ddgainu/3652825093.pdfIn PDF document text
    • http://aostavet.it/userfiles/files/poxagopusopumamutib.pdfIn PDF document text
    • http://agavietnam.com/img/files/wawis.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dbddb3cd1d---vijapikozozategekinuje.pdfIn PDF document text
    • http://kraski-chernila.ru/resources/file/kijug.pdfIn PDF document text
    • http://worldcar.jp/userfiles/files/55095104014.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160ac731c13807---6866852389.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=transformers+age+of+extinction+full+movie+download+in+dual+audio+720pPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB08 11572 bytes
SHA-256: ec69155a1fa0df7f00500253b3cf35281df1c0b0a185833deeddd6763bb23454
font_01_sfnt_off0000f639.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF639 1284 bytes
SHA-256: 3f2eb68e56e0cc9b24f861ad510cb196f24dbc520975aefba06cb0b93c7ac786
font_02_sfnt_off0000fd95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD95 17360 bytes
SHA-256: 54a33e4f1f5feaa3e599345c4b9c7ae96790af108ccdb2c528166765ca7e9a8b
font_03_sfnt_off00012b54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1