Malicious PDF — malware analysis report

Static analysis result for SHA-256 f91ef0f152209664…

MALICIOUS

PDF

96.7 KB Created: 2021-07-19 19:53:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: f0b2fc36ac2de1a532efcade1117d48c SHA-1: 03567215d55281f5bbdcf7b50deae1ab012a939a SHA-256: f91ef0f152209664b91fbea3b6cbe1d76130e8c7d69ea9c41802e1450840919b
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress upload storage and other disposable hosting. These links likely lead to phishing pages or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/frm7vi3i979736c9jdshum7je1/73002817289.pdf In PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7efde683a2---25115165623.pdfIn PDF document text
    • http://castanienfamily.com/clients/74558/File/petimerule.pdfIn PDF document text
    • http://ipmarketing.net/userfiles/file/bawugesutikozesajefi.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071d6520d389---nosaxizoregoluredogisito.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b542f86b46d---12174796931.pdfIn PDF document text
    • http://trineckevzdelavani.cz/webpagebuilder/ckfinder/userfiles/files/janudabubegomemales.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/fadidura.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/sojepuna.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/4430ea29fb4cfe12058c897f596d44db/juzulenanagezaduxuzo.pdfIn PDF document text
    • https://irisapp.cn/uploadfiles/fckeditor/20210616/file/16238398556406.pdfIn PDF document text
    • http://ciarajewellery.com/editor_upload/file/94176947386.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/cc64f4c79ec245cf8780df4efc5b302a/99023964041.pdfIn PDF document text
    • http://buyyoutubelikes.com/ci/userfiles/files/52920186778.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a09a679780a---gotakowadodubekofadowo.pdfIn PDF document text
    • https://italvaping.com/file/31875698414.pdfIn PDF document text
    • https://sonarmusic.hu/up_image/file/kapapevoronewomilomipanot.pdfIn PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/dded86acf38bf4669a985b7a7e7e60ad/9992870247.pdfIn PDF document text
    • http://cerescommoditiesltd.com/Images_upload/files/5514899182.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///2021621192361845.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f89bb5acce---68271562448.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16083d577acc1f---24193237272.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085e8da771a9---66894864405.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad3c324cab2---jafovovijefimukuzunaxu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=symbolic+interactionist+perspectivePDF link annotation
    • 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_off00011850.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11850 16976 bytes
SHA-256: 04a35e90b8bcffa336fa51b6e2c1bcb67aa43e980e7f8a02dcdda3ede3bbfbab
font_01_sfnt_off00014472.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14472 10932 bytes
SHA-256: 9ac392ba45309a0a1b8567210283159ce49e26a10129aadf11cfb9a691c56da5
font_02_sfnt_off00015d8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D8F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1