Malicious PDF — malware analysis report

Static analysis result for SHA-256 532e0b4647c24751…

MALICIOUS

PDF

77.4 KB Created: 2021-09-20 18:21:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c2c14a43ac5f01e19350d823d5444ca4 SHA-1: a17c26995199d67021bb57bf4e763dee49b1e185 SHA-256: 532e0b4647c247519b69259360432604f6d12548cf8ae39f461d4ccb8cd7707a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs pointing to various websites, indicating it functions as a link farm. Several heuristics suggest these links are part of a phishing or malware distribution scheme, with one URL specifically targeting search terms related to resetting Samsung Android devices. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://irlanc.ru/uplcv?utm_term=samsung+android+auf+werkseinstellungen+zur%C3%BCcksetzen
    • http://szhlfz.net/upload/23286419403.pdf
    • http://kietminhrivet.com/upload/files/32251157937.pdf
    • http://ausafe.net/images/art/files/kapomezozude.pdf
    • http://solo-reisen.com/media/images/file/17039549835.pdf
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/d5sh7qthl7qh16p4ehk3mk71ad/13945507698.pdf
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac7b79e29f---93657070334.pdf
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613fac019c17e---niduwufitateragabapido.pdf
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/6p4lfe66isf188653l33mkob66/13956701701.pdf
    • https://solucionaesp.com/ckfinder/userfiles/files/lodone.pdf
    • https://goldmenu.com/userfiles/file/xofenatiwisotizesumi.pdf
    • http://efuturesthai.com/uploads/files/zusexotezapikokikozinub.pdf
    • https://kme.pl/global/app/webroot/uploads/file/16318552870449.pdf
    • http://www.drivingschool-brno.cz/files/files/zodaxagaxow.pdf
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16141c4f72604f---24248340258.pdf
    • http://interiorconsignments.com/media/file/dabaxawolezi.pdf
    • https://schmitz.cz/res/file/romig.pdf
    • https://ph789.com/pinhsuan/files/file/84863873796.pdf
    • http://imapbook.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/97668254833.pdf
    • https://aildf.in/userfiles/file/73850306760.pdf
    • http://specialcats.nl/media/files/satuwewamokibubom.pdf
    • https://cfaegaianascente.pt/portal/userfiles/files/15726762559.pdf
    • http://retailpark.bg/uploads/wysiwyg/files/27805667009.pdf
    • http://tscyw.net/userfiles/file/20210912204437_svrpiw.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c376.bin
a1123e7db52111c878be03fef61a98b3917a07c085453287b9997d610f56279c
pdf-font-stream PDF embedded font (sfnt) at offset 0xC376 18528 bytes
font_01_sfnt_off0000f1da.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DA 16792 bytes
font_02_sfnt_off000109f1.bin
af6c9ca3f9f82bd81fb2535316665db5c4628c84f3653144c32bbd62ea62b1e9
pdf-font-stream PDF embedded font (sfnt) at offset 0x109F1 11424 bytes