Malicious PDF — malware analysis report

Static analysis result for SHA-256 23f8ec0e8fb59720…

MALICIOUS

PDF

77.8 KB Created: 2021-09-21 18:28:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 653effff51616479932a9cac2a6242a7 SHA-1: c391e5ce77d82e63cfce904b5f408bb38327a995 SHA-256: 23f8ec0e8fb597206d18933230abd7ec170918a07385863a8a7e199c181a4b06
156 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 disposable hosting or compromised CMS upload directories, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9829

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://maintogelonline2.com/contents/files/kolud.pdf In PDF document text
    • https://asfus.net/virgsurv/userfiles/file/44931939563.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/28700821352.pdfIn PDF document text
    • http://www.saletime.gr/admin/fckfiles/file/14104063460.pdfIn PDF document text
    • http://www.asap-recruitment.net/upload/file/56778001393.pdfIn PDF document text
    • http://himalayakebab.com/shipinc/userfiles/files/delisivegixogefega.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16134f149b27f5---54277378357.pdfIn PDF document text
    • https://mygoaltv.com/ipp/images/uploads/files/fovimopumojoxeda.pdfIn PDF document text
    • http://teplolux72.ru/upload/file/rabifajezenilutawapaxotin.pdfIn PDF document text
    • http://emiem.pl/public/upload/ckfinder/userfiles/files/14609950721.pdfIn PDF document text
    • https://thebookonpersonaltransformation.com/FCKeditor/file/26716022368.pdfIn PDF document text
    • http://cayxaotamphan.net/userfiles/image/file/12080791197.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/25108694621.pdfIn PDF document text
    • http://otohyundaidanang.com/uploads/image/files/wemixi.pdfIn PDF document text
    • http://theclelandgroup.com/img/upload/file/katidoko.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/b07f9a3b6941796065ac5b3c485364d9/julikunexobowisiwulivof.pdfIn PDF document text
    • http://boras-sjuharad.boj.se/uploads/userfiles/files/68548996818.pdfIn PDF document text
    • http://a899.net/userfiles/file/56026195268.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/308a8fad63c86e6d308176c04c7df1bc/32962670057.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/9igs7avh460rq36lbm97m6nmv0/48981432464.pdfIn PDF document text
    • http://3qlohas.com/CKEdit/upload/files/87108082356.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/nudozeruleposivod.pdfIn PDF document text
    • http://vnationwide.com/userfiles/files/13013456197.pdfIn PDF document text
    • http://euro-ex.net/images/blog/file/kikorawowexir.pdfIn PDF document text
    • https://flavio-tonon.it/public/file/71004392186.pdfIn PDF document text
    • https://oceanflowerhotel.com/uploads/image/files/xezagugafaketat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=spider+stickman+game+downloadPDF 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_off0000c306.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC306 11108 bytes
SHA-256: fda27e0970f87c02e952c60069023467985e4682b0e04fb8328e15c74fd576b6
font_01_sfnt_off0000dcc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC0 20116 bytes
SHA-256: 3c72874dfa53b8eeefbc761bbb13e4ee17712eac4d4b06a6cb23489d887002af
font_02_sfnt_off000111ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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