Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4bd8282b0cdeba0…

MALICIOUS

PDF

79.4 KB Created: 2021-09-18 20:15:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 176e30fdc76666fd2ceff7bdfc9d12b7 SHA-1: 744e217cbe9901ce2623d98c87606a79a93a767a SHA-256: a4bd8282b0cdeba0f2f9d38042ae9d093025985a2fcb769fa3f5dd66236df57e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV, indicating a high likelihood of malicious intent. The presence of a link farm on disposable hosting and compromised CMS upload storage suggests an attempt to lure users to external sites. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://pixomot.ru/uplcv?utm_term=things+to+build+in+minecraft PDF link annotation
    • http://tofuyatogo.com/uploads/files/nonoman.pdfIn PDF document text
    • https://alarouba.com/ckfinder/userfiles/files/zapavokawina.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc45a825b8---96182625670.pdfIn PDF document text
    • https://ooo-kenk.ru/userfiles/file/41613066224.pdfIn PDF document text
    • http://retailpark.bg/uploads/wysiwyg/files/wemupozetepireputafabet.pdfIn PDF document text
    • http://interroadholland.nl/userfiles/file/gunubu.pdfIn PDF document text
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/rerozeboparufuf.pdfIn PDF document text
    • https://warungmimpishio.com/contents/files/90417455840.pdfIn PDF document text
    • http://aotem.com/data/home/qxu1780220113/htdocs/uploadfile/files/kaduwa.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16140bbdad33b8---26190408749.pdfIn PDF document text
    • http://fittbikese.hu/files/file/bakemesibezisoxakepisevaj.pdfIn PDF document text
    • http://stepasidemedical.com/images/uploads/file/6201383764.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff0f70c3bf---52583206655.pdfIn PDF document text
    • https://iveducentar.com/uploads/assets/file/4437580976.pdfIn PDF document text
    • https://webshopplus.nl/app/webroot/files/userfiles/files/wigobefodivagoxurikub.pdfIn PDF document text
    • https://viscom.bg/uploads/wysiwyg/files/rirok.pdfIn PDF document text
    • http://hulstcustoms.ru/uploads/files/wodijemari.pdfIn PDF document text
    • https://samsungklimamodelleri.com/upload/ckfinder/files/ximofutipalegam.pdfIn PDF document text
    • http://samurairamenbar.com/uploads/files/futusedex.pdfIn PDF document text
    • http://7seapharmtech.com/Uploadfiles/files/mezifagonuzudusep.pdfIn PDF document text
    • https://simbhaolipower.com/images/file/guwotokivesenukerezu.pdfIn PDF document text
    • https://oolong-dining-co.com/webroot/editor-uploads/files/94758916188.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_off0000d207.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD207 17192 bytes
SHA-256: a9b033a1432fdef7339e37acfd0d468d35b3c0d12921b515b35b9c833a34cb61
font_01_sfnt_off0000fe98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE98 11128 bytes
SHA-256: 18a6744c09b3621a803d436c59dcf8ce4cfd2e06452941144bd1d049347b0e81
font_02_sfnt_off00011825.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11825 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1