Malicious PDF — malware analysis report

Static analysis result for SHA-256 242221ed86df0511…

MALICIOUS

PDF

76.4 KB Created: 2021-08-25 12:25:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d98f1b8f55d191d08c4e13cc69c8fdec SHA-1: e0af25e204cb5062816f5aace1c21b23ab1a7614 SHA-256: 242221ed86df0511b663b0fe3c0037557c8e7d819afa2695db24ee1702454b4e
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 compromised websites or domains designed for SEO manipulation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing further malware. The presence of link farms on potentially compromised CMS uploads suggests an attempt to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 http://soundupgrade.nl/site/data/ws/files/5598837851.pdf In PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/654si68tmmr7mf8q6l0of1fil6/74418758508.pdfIn PDF document text
    • http://bestbuyfromindia.com/userfiles/file/64860035746.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a516f7d593f---mewezimaloj.pdfIn PDF document text
    • http://brixtontaxi.com/survey/userfiles/files/fedesuwepedefesax.pdfIn PDF document text
    • http://ronaldtan.nl/images/photo/76129365142.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fe5bec8d7a4---99072102302.pdfIn PDF document text
    • https://eurocomm-italia.com/file/mejow.pdfIn PDF document text
    • http://elma1.ru/!upload/files/pagokaso.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/farak.pdfIn PDF document text
    • http://globeksa.com/ckfinder/userfiles/files/92844314513.pdfIn PDF document text
    • http://www.dereformasenalicante.com/archivos/files/tevozin.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160eda8a8ce4ec---93793362968.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/pozegovitemugidelawarewat.pdfIn PDF document text
    • http://hy-concrete.ru/d/files/nelajisufep.pdfIn PDF document text
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/213ef460f81fe8fe41580193d1410050/65705866084.pdfIn PDF document text
    • https://hotelindigha.com/FCKeditor/file/dibovadivom.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/de8ee10b9286cd3e62871b3a68f18f3a/timenutaviki.pdfIn PDF document text
    • https://hojoairport.com/images/file/84735687958.pdfIn PDF document text
    • http://interstyle.org/content/xuploadimages/file/59543778365.pdfIn PDF document text
    • https://kalyna.ua/sites/default/files/userfiles/file/basutefexaru.pdfIn PDF document text
    • https://gizaviation.com/uploads/files/47635487890.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/g5vrj1ahk53mid4m0n6rd888n6/70723590584.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=a+thousand+years+guitar+tabPDF 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_off0000c71e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC71E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF30 16508 bytes
SHA-256: 3963bbdcc84fb6a08f0a9901fa22e07e66ca113899cd1c4b56a515f914551968
font_02_sfnt_off00010a8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A8B 10816 bytes
SHA-256: bf75315a486bc1a0b75bc65b9623c6e544d2b538e0a36759902cedd94e4189ff