Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2c9ea438753a6d9…

MALICIOUS

PDF

71.8 KB Created: 2021-09-29 00:24:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 009c8ac0207a3878c31944071e4bd371 SHA-1: 48ef9ad7940a00043696d1830f50981b1c324a55 SHA-256: a2c9ea438753a6d9cb0dfbef65f75fa1d4091d76acff6bb72a3619b5c689ddb6
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and links to compromised CMS upload storage, indicating it's designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the link farm nature is a clear indicator of a malicious attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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=gradient+ai+photo+editor PDF link annotation
    • https://www.karelo.com/uploads/File/51435743702.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.com/ckfinder/userfiles/files/99382532343.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141177fa50c1---wavilezuxivibanaduranedav.pdfIn PDF document text
    • http://torremaggiore.sitmap.it/files/files/zivizotukedu.pdfIn PDF document text
    • http://youngthisyear.com/ckfinder/userfiles/files/radekofefifirux.pdfIn PDF document text
    • http://baocaosudanang24h.com/uploads/image/files/43284051695.pdfIn PDF document text
    • http://builderall.info/userfiles/file/kutatoxitufamidodifiv.pdfIn PDF document text
    • https://www.la-providence-ehpad.fr/ckfinder/userfiles/files/rasapedodejuribewirulit.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/f917b4ea921828da7306276d0acb015f/wukosinatebiduzibivuded.pdfIn PDF document text
    • https://consultemergingmarkets.cubsindia.com/files/88891001273.pdfIn PDF document text
    • https://myclubowners.travelenvogue.com/userfiles/files/48084002425.pdfIn PDF document text
    • http://studionegro.net/userfiles/files/gazijut.pdfIn PDF document text
    • http://1-champagne.com/blog_images/blog_/file/xetofojebibegobosukamox.pdfIn PDF document text
    • https://kaktutzhit.by/uploads/files/4494478336.pdfIn PDF document text
    • https://renetravel.ro/images/files/kowapawolamijeroposetub.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/93794517550.pdfIn PDF document text
    • https://aymfly.com/aym_image/files/kenafebiwavizodekinavifux.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021090307384557.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/e9d0b57dc07832cde41dc6a51aa6ffb2/82960543547.pdfIn PDF document text
    • https://jpjplumbingandheating.com/FCKeditor/file/2124682318.pdfIn PDF document text
    • https://smartcirclegroup.com/userfiles/file/98431339930.pdfIn PDF document text
    • https://kcharp.com/ckfinder/userfiles/files/lewezisatizabizasej.pdfIn PDF document text
    • https://sanvexe.vn/webroot/img/files/16467632334.pdfIn PDF document text
    • http://tuhocxuatnhapkhau.com/uploads/ckfinder/files/28198777974.pdfIn PDF document text
    • https://partroyfuneralhome.com/partroy/assets/file/furewipowaxidabuzigij.pdfIn PDF document text
    • http://bikaji.zohukum.com/ckfinder/userfiles/files/moponaxekebavujidegosofup.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_off0000b67f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB67F 17248 bytes
SHA-256: 6a2bdbaedb1d67db383162ca2c9b52b0cbda3ac158ed0d0cf563547bc0837c11
font_01_sfnt_off0000e289.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE289 10312 bytes
SHA-256: 90d4e72f4be99226716be83d2ab1f4b7602387c989ab77aba47ea4760f2c738a
font_02_sfnt_off0000f9ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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