Malicious PDF — malware analysis report

Static analysis result for SHA-256 527255f0925c4ad6…

MALICIOUS

PDF

84.3 KB Created: 2021-08-15 09:11:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 8fcfa20729dca1e6dcea08ccb1339645 SHA-1: f9a31b79262e0956b32fa5538685e55a095133b8 SHA-256: 527255f0925c4ad6c0313f29b71ad8d14e3b05810e8b67bdaa8ceb43c42240a7
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://parfumerieindex.nl/images/uploads/51348144405.pdf In PDF document text
    • http://identik.hu/editor_up/kewasekajuvedisulajexejel.pdfIn PDF document text
    • https://istanajp2.com/contents//files/15433140083.pdfIn PDF document text
    • http://scuderieverdina.it/scuderia/userfiles/file/33793827124.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/548a29dd6646c6e32878fc1b9000fe96/53580507354.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16086b2a487f92---xemewerepefi.pdfIn PDF document text
    • http://stonebreaker.at/61106029815.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607544936b0b8---71996350483.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16084c4e59be0b---wutujireredudazarilozene.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/l2pkpl2lp8auv88gq8k2jhd64k/71965897302.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/5509098027.pdfIn PDF document text
    • https://patc.fr/imagesfile/85847526044.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610054f8c806c---vexogizelik.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d48902712ac---nujosofugesimeva.pdfIn PDF document text
    • http://ranahytta.com/ckfinder/userfiles/files/40462836675.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/fa98e772db6d8ac7fbc1816cdbd19485/wikiworepogarovore.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160766645937aa---90421116006.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/rarowusigewewupolunodaki.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/beturi6rg8urnhuecbrfuiomj5/tafibigakenibotojoxozu.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/b984678c45775c80901c770d5ee02c37/wulaj.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/3fddadbe4e9dfceba749d3d7e834ce36/jivotaripukoxipi.pdfIn PDF document text
    • http://jedwines.com/cmsCart//upload/file/26504589916.pdfIn PDF document text
    • https://gs-hemeringen.de/ablage/userfiles/files/65289491962.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=captain+america+super+soldier+pc+game+download+apunkagamesPDF link annotation
    • https://www.unimedbelem.com.br/painel_template/assets/global/plugins/ckfinder/userfilesfiles/lopunegapevo.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_off0000e362.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE362 11168 bytes
SHA-256: 174148279fe83f2d3476aac634195dcc2690f922e4920e2eaaed4c7767edd6f0
font_01_sfnt_off0000fd55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD55 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011567.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11567 17044 bytes
SHA-256: 45fdcd8a8f54e2b20fb02059e2bced6f4dbd3df38bdfe73b078c2bc1443f02cc