Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2de94995a142cdf…

MALICIOUS

PDF

93.7 KB Created: 2021-09-18 11:51:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c35f490867884ac0cd0b888f9e118b6c SHA-1: bd9ff237c37ba7410105d720ab8b212eea72eaa6 SHA-256: a2de94995a142cdff7d73174490b9dac9a6ba2dee48ea6a4ef941c271f9c45b3
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable domains, indicating a link farm or redirection scheme. The ML classifier strongly flagged this PDF as malicious. The document body is heavily obfuscated and unreadable, providing no direct user-facing content, but the heuristic firings strongly suggest a malicious intent related to URL redirection and potentially hosting further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

Heuristics 5

  • 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://laborke.ru/uplcv?utm_term=rang+de+tamil PDF link annotation
    • http://www.valathors.com/ckfinder/userfiles/files/19051625734.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/94516499082.pdfIn PDF document text
    • http://bebsulmare.com/userfiles/files/wururawetakolozeg.pdfIn PDF document text
    • https://ckmusicdesign.nl/userfiles/file/vikininejukasajufox.pdfIn PDF document text
    • https://lee-trading.tw/archive/upload/files/92801378776.pdfIn PDF document text
    • https://5udua.com/contents/files/borogibixin.pdfIn PDF document text
    • http://thebookmarkcafe.com/uploads/files/47325922168.pdfIn PDF document text
    • https://realxenon.ru/uploads/files/dazotonejazurajusidun.pdfIn PDF document text
    • http://avtokit116.ru/!upload/files/mijewefopototorofokavopo.pdfIn PDF document text
    • http://avon-bratislava.com/files/files/40866315936.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/e7935c113c6c06b6845f4c8206ea68c6/86640829277.pdfIn PDF document text
    • http://knowleangling.co.uk/ckfinder/userfiles/files/polikuvululoganal.pdfIn PDF document text
    • http://gabinetortodontyczny.eu/userfiles/file/zevolesotixaxaba.pdfIn PDF document text
    • http://gps-ambroisie.com/ressource/site-image/files/51890762211.pdfIn PDF document text
    • http://fasson.vip/images/editor/files/15373123821.pdfIn PDF document text
    • http://parfumerieindex.nl/images/uploads/26869624538.pdfIn PDF document text
    • http://forglass.sk/userfiles/file/20189644514.pdfIn PDF document text
    • http://dellalontra.it/userfiles/files/pofoguximolarikixesoviw.pdfIn PDF document text
    • http://hla.vn/upload/files/63118765534.pdfIn PDF document text
    • http://oletrans.sk/editor_uploads/files/33337011452.pdfIn PDF document text
    • https://thingstodobahrain.net/ckfinder/userfiles/files/28995317631.pdfIn PDF document text
    • http://hamlineparkplaza.com/assets/amund/ckfinder/userfiles/files/zupujogebuwu.pdfIn PDF document text
    • http://rtm-plus.com/ckfinder/userfiles/files/mupakofak.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613012609f02a---setowezevur.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/d4b97e07a274ded0241ad54a645a42ca/nunutogotudowolep.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
stream_006_off00012a82.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x12A82 25084 bytes
SHA-256: 6bd1fd63c556481d9d93df1c199d8732647a5ef37d89b9b8c0bdcdbe38cd21ac
font_00_sfnt_off0000e5cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fde4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE4 10248 bytes
SHA-256: afbd9d72421d890d257bab7d28f4e2fcce83af45fc911e58d7a5f0312ab97787
font_02_sfnt_off00011498.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11498 16244 bytes
SHA-256: fddcbe21bdf9fb2753729b4ab5b26d7a3fbb01e3fe51d41ab0725360e25c189d

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