Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cece9a4c91038f3…

MALICIOUS

PDF

82.7 KB Created: 2021-09-10 21:21:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 187b735741ed8bf73e5cbe74ca8065dc SHA-1: 8c2dba5d0ae724960398591805c22752487aee01 SHA-256: 1cece9a4c91038f36c948dd614178ce980016a536435d66058439cbc2141faf0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external URIs and link farm heuristics, indicating its primary purpose is to redirect users to potentially malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing or trojan delivery mechanism. The document body is heavily obfuscated and unreadable, providing no direct content-based clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://archism.ru/uplcv?utm_term=android+studio+for+beginners+pdf PDF link annotation
    • https://betenagro.com/sites/default/files/file/rovixalew.pdfIn PDF document text
    • http://talani.nl/userfiles/image/file/latifidupux.pdfIn PDF document text
    • http://lednotice.com/userData/board/file/nisegivurag.pdfIn PDF document text
    • https://1tlstar.com/storage/uploads/files/bedogopaserepalu.pdfIn PDF document text
    • https://irastuff.com/admin/ckfinder/uploads/files/43960844051.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/14636976702.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137df578569b---23352178911.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1612f97df682ec---63350788787.pdfIn PDF document text
    • https://vnmmalta.com/userfiles/file/2880905596.pdfIn PDF document text
    • http://stmrcstvm.com/userfiles/file/kepusetupiforozedu.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae4a9cb106---gepojibajowunoralabuf.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/majunemerokoradev.pdfIn PDF document text
    • http://supragyn.cz/userfiles/file/68148625485.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613953b5791e4---58293676903.pdfIn PDF document text
    • http://pension-erlkoenig.de/img/editor/file/18866696511.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132d89b8ebd7---detokegibe.pdfIn PDF document text
    • https://next-engineering.com/userfiles/files/xibesumibatebuvuzerowad.pdfIn PDF document text
    • http://yjccnc.com/upload/files/wamavewe.pdfIn PDF document text
    • http://interstroy96.ru/uploads/files/tujon.pdfIn PDF document text
    • http://dmkaudit.sk/101/upload/file/41330778257.pdfIn PDF document text
    • https://luxm.pl/userfiles/file/16447219957.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/85afd7897779c1273988ca0192f64be7/nukemupimasigisaxono.pdfIn PDF document text
    • http://tion.hu/upload/file/lereborinifewolep.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613859e17a854---sosoxelumifupebeg.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE61 10688 bytes
SHA-256: 704163ac1cbb23196da831fcad36248a80f22843aca9a287324d2de6e94b7e32
font_01_sfnt_off0000f69a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF69A 17984 bytes
SHA-256: 54470fea8ef334712bf9e8b49027cef037699c9b27251b6e0f0ba54021646e12
font_02_sfnt_off00012514.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12514 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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