Malicious PDF — malware analysis report

Static analysis result for SHA-256 572a9e45c1aa09af…

MALICIOUS

PDF

72.6 KB Created: 2021-09-08 00:48:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 99942c5169591921b1bc67597631f520 SHA-1: 97f7b36629ad9e7fa60756b3f5bcd44a7337b414 SHA-256: 572a9e45c1aa09afd25db9a81a4e8c66bdd5d0aa41c63bdfc0350b3a94960ae4
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised WordPress upload directories, suggesting a phishing or redirection scheme. The PDF structure and embedded links are designed to lure users to these external resources.

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://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ada7e7be4ec---ladisarugutig.pdf
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/jrun8d6fb756p50vv3ogt9fde2/52546823030.pdf
    • http://vitalenzyme.com/uploads/fckupload/file/ginavudukimimisujezozilon.pdf
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/ol1tbjv5svck6vs2vpd5uqhin3/81960715088.pdf
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160799269aa0c5---41623698447.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/b80709efe016a886f7088b9ad05e873f/nurofemuliwugexuwozisun.pdf
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/772f0b47546d26b87b9ba17ca22d9c79/9200279033.pdf
    • http://xinyaoqiye.com/upload_fck/file/2021-6-15/20210615144624639152.pdf
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c21921549cf---woxeromuturelufugo.pdf
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/wisabixilaxetot.pdf
    • https://successstudio.net/userfiles/file/73315531731.pdf
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/16112411273379---8177637266.pdf
    • https://trotusgrup.ro/ckfinder/userfiles/files/vunok.pdf
    • http://sp3siemianowice.pl/userFiles/files/72891119421.pdf
    • http://www.gpe-el.pro/ckfinder/userfiles/files/futokumabokubope.pdf
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16071c334e0564---18053491285.pdf
    • http://adice-area.com/pictures/files/15272374345.pdf
    • https://sunpower.lv/ckfinder/userfiles/files/98454230981.pdf
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/qa0omiaci7vbcp9bs391vh7c69/60708129204.pdf
    • http://ugrctrani.it/userfiles/files/rijasexuxidajid.pdf
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609a3c79883e6---fuxokawumudizu.pdf
    • http://muzeumostrowiec.pl/obrazy/file/liziwusip.pdf
    • https://tedvandergulik.nl/userimages/file/22562704565.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=leucemia+linfocitica+cronica+tratamento+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_off0000bb02.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xBB02 16792 bytes
font_01_sfnt_off0000d319.bin
6d009025019c682890508af1f49bdc28476d2e5d368c027f886fec125c44691e
pdf-font-stream PDF embedded font (sfnt) at offset 0xD319 10668 bytes
font_02_sfnt_off0000eb76.bin
fa2e78ca18e67c1a0c1727c0a2e01d6c1de98ad275772b602b4935b2585cf930
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB76 16096 bytes