Malicious PDF — malware analysis report

Static analysis result for SHA-256 76b8ff2d461b6b67…

MALICIOUS

PDF

70.5 KB Created: 2021-09-12 21:57:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: af8679250f46aa9d17b01b9d73e2c39f SHA-1: 8214256ccc6d22aa2f30a731e1c311b7d2da2f0b SHA-256: 76b8ff2d461b6b67ff233837ba3e721b88a2b207e51cfbfbceffdcb7ea49ea82
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farm heuristics, indicating its primary purpose is to redirect users to potentially malicious websites. ClamAV and ML classifiers strongly flagged this PDF as malicious, specifically as a phishing trojan. The embedded URLs and the nature of the heuristics suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://drafthe.ru/uplcv?utm_term=doraemon+android+game+download PDF link annotation
    • http://khonggianmang.com/upload/files/26415540010.pdfIn PDF document text
    • http://stilna-ya.com/_userfiles/file/34857268239.pdfIn PDF document text
    • https://www.icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/gobozewebomesenimuf.pdfIn PDF document text
    • http://color-gateway.com/userfiles/file/58629487418.pdfIn PDF document text
    • http://sweed-trans.eu/ckfinder/userfiles/files/fovomejotojedebu.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/1207256a8e8c17ad8b785ba760c7a309/39496703126.pdfIn PDF document text
    • http://yonezawanet.jp/units/24250/zcycom/files/55311008716.pdfIn PDF document text
    • http://papianiarch.it/userfiles/files/nonakakikeguner.pdfIn PDF document text
    • http://ranjitabiswas.com/userfiles/files/fowetevugunizimel.pdfIn PDF document text
    • http://mudrberanova.cz/userfiles/file/nigonotelumirawewab.pdfIn PDF document text
    • http://limeitec.com/upfiles/editor/files/disakazawiradakunoseso.pdfIn PDF document text
    • http://ohdiabo.net/images/ckeditor/files/27131841137.pdfIn PDF document text
    • https://777mto.org/contents/files/zikixadisenazakuzikuwaf.pdfIn PDF document text
    • http://michelesherrinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/15628464354.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/57291bf05abed3671462960a1c24c3dc/bofupiriruga.pdfIn PDF document text
    • https://behagi.eus/files/galeria/files/7719821598.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/161365da089274---naxevupenufukojewap.pdfIn PDF document text
    • http://nyett.hk/uploads/news/files/94361467153.pdfIn PDF document text
    • http://vinaktv.com/storage/ckfinder/files/wimoju.pdfIn PDF document text
    • http://bronnicy.inhome360.ru/admin/ckfinder/userfiles/files/75261403324.pdfIn PDF document text
    • http://bibliotekaludwin.pl/img/upload/files/lubakebasoku.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7f5db588c---fugew.pdfIn PDF document text
    • http://chongqinghaohong.com/upload/files/97697492000.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_off0000b67a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB67A 10412 bytes
SHA-256: b29e0bf19c657c4d8397938de46f3c780b4f22af4e48024b9e12cc158f61e821
font_01_sfnt_off0000cdc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDC7 15272 bytes
SHA-256: 45e8d57d9ecf2572715b9dbafb588c4d76d2e16b336dea642517194ea146711e
font_02_sfnt_off0000f447.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF447 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1