Malicious PDF — malware analysis report

Static analysis result for SHA-256 afbd67b75b309e99…

MALICIOUS

PDF

92.0 KB Created: 2021-07-08 06:25:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c918084a9fd706ff6ad22ec859b52733 SHA-1: 986f64281147597c6c0b6a9de5f81ff63e371059 SHA-256: afbd67b75b309e99c03ab4d9a775467c0f8b3e677b7af28b31a489d46ab14536
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting. The primary purpose appears to be redirecting users to external sites, which could be for SEO manipulation or to serve further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adc09863f76---lidanigevilituxex.pdf
    • https://susta.vn/userfiles/file/89663366673.pdf
    • https://avvocatoboretti.com/file/xixofagewoka.pdf
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/e83l7ftuub3nb29hum3vvs0hr3/11283548116.pdf
    • http://jsdarvin.com/files/tugorafabowibome.pdf
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c976e86510b---gakivesimiwedojitija.pdf
    • http://biurod9.pl/public/userfiles/file/dupavaxakipazixavetek.pdf
    • http://amandatravel.com/userfiles/file/tupogerixifijabanak.pdf
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/qb9kgjkiki9v0n8dsee0eo7gkd/fipadajurolojakatutozek.pdf
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16092c3a2b8494---pixotojarugeg.pdf
    • http://mdc.ir/ckfinder/userfiles/files/91611547351.pdf
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb723130bd---23317521211.pdf
    • https://perfecthospital.org/FCKeditor/file/16968082082.pdf
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/34335308589.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080036cb6195---76924736852.pdf
    • http://klimatyzacjaradom.pl/userfiles/file/39767777816.pdf
    • https://bostoncake888.com/UserFiles/files/fapogikuxepaginegevav.pdf
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/8nkph35qle291fm72n708ij902/85739629648.pdf
    • https://galerie-louise.be/userfiles/files/56458279681.pdf
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/690b62f86a2d52ed39b62257be8d2895/xawojaxefodexozeda.pdf
    • https://fiordipannacremeria.it/file/26701007248.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=successful+differentiation+allows+a+firm+to
    • 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_off000103f9.bin
32e72fe43dbc44eee1eb7f9455ad660563924f3d6a636c88988af6615288c2e3
pdf-font-stream PDF embedded font (sfnt) at offset 0x103F9 17364 bytes
font_01_sfnt_off00013147.bin
45327beff19a305f6cd8579b4fdf13c4512a79c12dbbe6ac6c29b5136b40f777
pdf-font-stream PDF embedded font (sfnt) at offset 0x13147 10900 bytes
font_02_sfnt_off00014a83.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14A83 16792 bytes