Malicious PDF — malware analysis report

Static analysis result for SHA-256 199299f9f818574a…

MALICIOUS

PDF

79.0 KB Created: 2021-08-20 12:47:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 53c6d8b52d1cd81eabb371f893cdd75e SHA-1: c6e5d87774b644fc8fe6928aeb01714ee49caa10 SHA-256: 199299f9f818574abef6e45eb89fe80ac24d52c7c00257695bc27054d46a0c9c
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to numerous external URLs, many hosted on compromised WordPress sites. The document body is heavily obfuscated and unreadable, suggesting it's not intended for direct user interaction but rather to facilitate redirection to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://krisoc.ru/uplcv?utm_term=kaun+tujhe+female+song+mp3+download+pagalworld PDF link annotation
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/vn2pkevhh8ctv6ot27t11kubj7/xewoveviwapemuxaxila.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/f35e2dqm3vg1qqmgh8fne1sj6i/29991335098.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/sopc2qdeh64p3273633rraa9j4/zawotagepiroro.pdfIn PDF document text
    • https://centrorevisionimonregalese.it/file/besora.pdfIn PDF document text
    • http://urparitet.ru/admin/ckfinder/userfiles/files/38473067482.pdfIn PDF document text
    • https://adtw1.com/ckfinder/userfiles/files/25088640473.pdfIn PDF document text
    • http://www.udelimpa.es/ckfinder/userfiles/files/90995356982.pdfIn PDF document text
    • http://wamer.org/userfiles/file/83612743179.pdfIn PDF document text
    • http://donghocitizenchinhhang.com/uploads/userfiles/file/47547768040.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16092687e60436---62412386793.pdfIn PDF document text
    • http://sola-brothers.com/userfiles/file/sajepum.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/78927186551.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/56l7ntv9kshb421cgajrb6g0ee/26729683061.pdfIn PDF document text
    • https://matfplayer.com/calisma2/files/uploads/xiviro.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a5221d12028---zuwanep.pdfIn PDF document text
    • http://aptatravel.com/clients/4/48/489dad2d2d8436d4c085fc0ccdc2d1b3/File/79125978343.pdfIn PDF document text
    • https://arhometutor.com/userfiles/file/92627690462.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160817789ab683---bemanobutosajosena.pdfIn PDF document text
    • http://partnerplus30.ru/images/fornews/files/66100667408.pdfIn PDF document text
    • http://cuatudongsaigon.net/uploads/files/zibowebofukidorogemu.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/vdc44p1s24qauu6ptve88ntjuu/romaj.pdfIn PDF document text
    • https://arendic.cl/files/44424399404.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16078168e0403d---64947585681.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_off0000cf8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e7a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A3 11332 bytes
SHA-256: 435cbbff4914f0eb542e69aed75150b9e4d61e7278390995e1cf9a5ebadd5967
font_02_sfnt_off00010205.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10205 16804 bytes
SHA-256: 4f352fc34d68dafdccb7e98919a3b42a4a844a090886ea3b8353decb4422308b