Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9999fec3f8f7220…

MALICIOUS

PDF

82.2 KB Created: 2021-09-03 01:07:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 63746c2d25e9d34b3ec868681a15748b SHA-1: 94cb2ade8998f93bc14c3f05856a194a2df2d9b1 SHA-256: a9999fec3f8f7220e0cf8b1ad9b32c2ea5b4a6ad1a4bf5a90d00b4124255ee6b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file functions as a link farm, directing users to multiple compromised websites and disposable hosting domains, likely for phishing or SEO manipulation. No scripts were extracted, but the presence of numerous embedded URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest the document's purpose is to redirect users to malicious or deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1608a274819b4c---zofifadenasose.pdf In PDF document text
    • http://tantex.org/tantex/tantexuserfiles/file/tigorupenimag.pdfIn PDF document text
    • http://sashtraayurveda.com/ckfinder/userfiles/files/37781349254.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/f100abd38b6586f2887228c5a227388e/68974274464.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071c8f97e2a1---59923815398.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/8ba00d7195f7349a764c514c6a6e310a/19985961249.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1607da8a24c95a---65270384546.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/834a222d5c9459a15e9db046983c9d0f/14583892002.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a059fedf9e8---59669573667.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/nezibuzuwe.pdfIn PDF document text
    • http://waukeganeast1980.com/clients/877304/File/nazonaxapalegikadejujola.pdfIn PDF document text
    • http://phutungototuanphat.com/img-tvdl/files/47339678888.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/82506403430.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160a107c6b3479---guzamexufelatiwetexus.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/lfp0ms3g8ic8nc4gbiqjbprfl7/90894521742.pdfIn PDF document text
    • https://chungcungoaigiao.vnpec.xyz/uploads/files/wuzidawuparik.pdfIn PDF document text
    • http://montagnobozzone.it/userfiles/files/lazulasomojijovomexupabib.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/71091308865.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/26928456489.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/92705864299.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/d77fe2fcff430bdc05a30f020d2d0053/64758836947.pdfIn PDF document text
    • http://baliretreatcenter.com/olabali_ci/media/images/newsfiles/domeninenakebaf.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160acf735be4b0---lofowutuvajamufanili.pdfIn PDF document text
    • https://kurtoglumob.com/upload/file/lonigugudimagum.pdfIn PDF document text
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/1e6e6fc3812bb761103141919c45af6a/kalidi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=solution+and+colligative+properties+class+12+notes+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_off0000db6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f381.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF381 17632 bytes
SHA-256: 1ab81f637d140122f5a207d00fafc80be92d1b20c1355db566e503da39dca225
font_02_sfnt_off0001206b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1206B 11208 bytes
SHA-256: adcf396b3439edfd53d0bdeffbf97904c996647bafdc8ff97fc334a40a09a687