Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2a30e0178be84f5…

MALICIOUS

PDF

66.4 KB Created: 2021-09-07 17:46:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a66ad80bfe030d946449d72e7217487f SHA-1: b891fa0a755fbdf7ac11777cf418fa0872a807f0 SHA-256: b2a30e0178be84f59a71cb3dc0dcd4dfdc1956eb8ee72a41787dd712368a9d01
124 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan. Static analysis revealed it functions as a link farm, containing numerous URLs pointing to various domains, many of which appear to be hosted on compromised CMS uploads or disposable hosting. This pattern suggests an attempt to lure users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3110

Heuristics 5

  • 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
  • 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://mackbeks.com/files/file/rizijinozol.pdf In PDF document text
    • http://woori-tour.kr/FileData/ckfinder/files/20210716_7C7BCF9EBE696AA6.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/fhd118cco4sqkk6lt30q1l2an9/tumidojewiliwamuragagu.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610808023c7c6---tanofaza.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4279b66ced---bupavelomofes.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16083cd67e7df1---34726533019.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/4dc57a568b995ded2f0aa86b82640bf2/1818988093.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/pofokumaxebazamimupet.pdfIn PDF document text
    • https://banghenails.com/upload/file/nebolakinovewiwixiguzu.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/gi8qfst314ed07fnfm2dsbvhq6/tefibakobodutelosidi.pdfIn PDF document text
    • http://dirpub.org/editor/ckfinder/userfiles/files/42043919350.pdfIn PDF document text
    • http://briquettemachinery.com/d/files/rexorakanejajifomufu.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e06bb3050---tevewuxufodudosuda.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160aab3785ae68---rokaf.pdfIn PDF document text
    • http://compufoxmail.com/userfiles/file/92468621954.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d5d2f9d1f87---27732357632.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/8g99frie8vds7j0junr6fp8g0g/puretojixebebararubiwalu.pdfIn PDF document text
    • http://vds-construct.pl/userfiles/file/xemopupizegekofuvunufes.pdfIn PDF document text
    • http://lavalnerina.it/userfiles/file/jinisagim.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097c0605d88e---90111923172.pdfIn PDF document text
    • http://changrung.com/ckfinder/userfiles/files/furanakevovumeraxemix.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/vadolifuguravavegesiza.pdfIn PDF document text
    • http://munsusa.org/userfiles/file/20210812154837.pdfIn PDF document text
    • http://mrs-edu.com/sribati/editor/uploadfiles/92744180004.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610bb7a1136d8---rojebonewu.pdfIn PDF document text
    • http://sieuthivatlieuhoanthien.com/upload/files/90209067194.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=gk+today+april+2018+pdf+freePDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b8eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8EB 10964 bytes
SHA-256: 80c4690cc751aa61a5c49b2a7e192fa811b469bf08848bc8ae2450c0a35fa539
font_01_sfnt_off0000d2a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2A3 15016 bytes
SHA-256: 9a7dd1a01b184407c14471a44122c6a17b7b528a24cc0eb2f18006eab1546f90