Malicious PDF — malware analysis report

Static analysis result for SHA-256 8113eef1ebb029ce…

MALICIOUS

PDF

82.9 KB Created: 2021-09-22 12:21:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d95f5e11d7f66d9d7c7d800f2d92f0c1 SHA-1: d552ef6983712690a1ca78c41510b80aaf5e3987 SHA-256: 8113eef1ebb029ce7a4b7d64ea71d9b02ee493ae053c2700c37188f35772b7ae
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. Heuristics indicate this is a link farm designed to host or redirect to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9887

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://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/13bc2c257b65564755042f8daed36cb0/biberimifevevavomagarox.pdf In PDF document text
    • http://acutecardio.ru/sadm_files/44850015524.pdfIn PDF document text
    • http://www.iece.in/userfiles/file/bikiwopifagiduf.pdfIn PDF document text
    • https://zapcdn.space/web/img/podborky/files/golifawuvupefojupikofukoz.pdfIn PDF document text
    • http://ministryofrum.com/memlogos/file/7964125421.pdfIn PDF document text
    • https://groupburuemas2.com/contents/files/52986354940.pdfIn PDF document text
    • https://colakcivi.com/userfiles/file/fepixupodakifunamiveli.pdfIn PDF document text
    • https://zapcdn.space/web/img/podborky/files/89787987483.pdfIn PDF document text
    • http://stin-verdon.fr/assets/Image/files/delawijavajaregilurez.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613cb410f07f3---garevetupuvikisulonevaf.pdfIn PDF document text
    • https://cakesandcupcakes.net/userfiles/files/23039929454.pdfIn PDF document text
    • http://grandwatergatehotel.com/upfile_hotel/files/vamoj.pdfIn PDF document text
    • http://elosc.com/upFile/file///ITX202109090559354651.pdfIn PDF document text
    • http://jjc-dev.com/userfiles/file/fuzadisunetesalaz.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16145afb9d3bcc---13198567648.pdfIn PDF document text
    • http://chukgoobok.com/files/fckeditor/file/govetekemib.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/77876948686.pdfIn PDF document text
    • https://nevisnews.com/userfiles/nemabumumezezawegiwi.pdfIn PDF document text
    • http://antwerp-reefer-tournament.be/argt/files/silewivugi.pdfIn PDF document text
    • https://bistakalikotenetwork.com/userfiles/file/53168208183.pdfIn PDF document text
    • https://tommytest.dish1314.com/data/html_editor/files/sefokazetivijajunev.pdfIn PDF document text
    • https://laurallo.com/ckfinder/userfiles/files/tobuxikaliraba.pdfIn PDF document text
    • http://vititanon.com/user_img/files/bolufukewasaxonimo.pdfIn PDF document text
    • https://shastriratanchatterjee.com/ckfinder/userfiles/files/24317976424.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/3f549c3172fb714b601ba9a15704167d/13181355593.pdfIn PDF document text
    • http://3q1p.com/upload/file/210909111725175952847zh5dv0ij2.pdfIn PDF document text
    • http://vinhomeshaiphong.net/app/webroot/img/files/wudotodo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=live+stream+androidPDF 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_off0000e150.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE150 17476 bytes
SHA-256: 876c684894ee653195f2ee2455eda0352c849f1d274bbbcca58670f843d9a9da
font_01_sfnt_off00010e9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000126b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126B5 10388 bytes
SHA-256: a33baea93105c8ee84e1b63f5f1e3731a4d633772c0b487d486c167a6a1cacbf