Malicious PDF — malware analysis report

Static analysis result for SHA-256 8eb831fdc1d9d854…

MALICIOUS

PDF

82.8 KB Created: 2021-09-16 19:17:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 79fa609ce2f1549f22e6de4f7148102a SHA-1: 1fe723679d1f5d02494606238a76711ac07fbd9f SHA-256: 8eb831fdc1d9d854fe017e9cafa5a9a65ad4232b04af1838779f6760f5583f8f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. Numerous heuristics indicate it functions as a link farm, pointing to compromised WordPress sites and disposable hosting, likely for phishing or malware distribution. The embedded URLs and the nature of the heuristics strongly suggest a malicious intent to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://medvor.ru/uplcv?utm_term=dosto+mod+apk PDF link annotation
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161391adcdc662---rimun.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/a78bloj40pphe9sfscvrl8pajg/27430212037.pdfIn PDF document text
    • https://jyapa.com/jhuoyue/uploadfiles/wevikuwa.pdfIn PDF document text
    • http://vipnovini.bg/root/f/uploads/files/nexovidiwasotagevotixi.pdfIn PDF document text
    • https://coimbatorepressclub.com/FCKeditor/userfiles/file/63462354582.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/kovomidadixemovisatajosow.pdfIn PDF document text
    • http://15881588.com/ckupload/files/57849452782.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/boledapomitu.pdfIn PDF document text
    • http://abwmarlboropike.com/uploads/files/xiwiwota.pdfIn PDF document text
    • http://el-master.ru/userfiles/file/22686440757.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/maxatixixotewuleri.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/0f2c20031061750b2ee38d85e3d1bd4a/43102692812.pdfIn PDF document text
    • http://hvezda-pardubice.cz/files/file/94429871496.pdfIn PDF document text
    • http://sp3siemianowice.pl/userFiles/files/garozepijajekodasagur.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/vuvetefapetowezexesamore.pdfIn PDF document text
    • https://digireg.lu/upload/12639223033.pdfIn PDF document text
    • http://ksiclubcom.ksiclub.org/svnprojects/DHD/Source/images/files/85855100999.pdfIn PDF document text
    • https://euforbiabulgaria.gbinvest.net/uploads/pages/files/45983619453.pdfIn PDF document text
    • http://robertfeinberglaw.com/images/edit_images/file/zaxonejanajotat.pdfIn PDF document text
    • http://anindecor.pl/files/file/vemaz.pdfIn PDF document text
    • https://chiataiec.com/userfiles/Proj_Name/files/gugufi.pdfIn PDF document text
    • http://cokhitienvuong.com/uploads/files/wulub.pdfIn PDF document text
    • http://rgn2u.com/userfiles/files/welawupawolisusuroba.pdfIn PDF document text
    • http://www.bluefashion.cz/ckfinder/userfiles/files/sekezoxajegip.pdfIn PDF document text
    • 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_off0000dfd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E5 18164 bytes
SHA-256: 96ce8a502a0bb67d36349ea9e13c1a28d9be12487a4470c1ca6310744196d54f
font_02_sfnt_off000126e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126E3 10172 bytes
SHA-256: d3c62158ae4f207667f11dcbaa814b32e51029814295208bd438e3571d511050