Malicious PDF — malware analysis report

Static analysis result for SHA-256 803e9cedad79b294…

MALICIOUS

PDF

85.7 KB Created: 2021-06-28 04:31:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 9cfd9e37b32fd94081269267d3bee343 SHA-1: e259a0c28369f57f425dd49f51b0c90a5e27f2c6 SHA-256: 803e9cedad79b294078e04cb0932db7ad0eb033d9eff73403e6fc4b4689b27e5
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farm heuristics, indicating an attempt to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of multiple compromised CMS upload links further supports the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://smidgel.ru/uplcv?utm_term=candy+crush+friends+saga+for+pc PDF link annotation
    • http://guowangcable.com/d/files/18104964801.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/mazapovawukonox.pdfIn PDF document text
    • http://toeicspeaking.net/_UploadFile/Images/file/zekakamapenipozejebove.pdfIn PDF document text
    • http://tomaszfilipczak.pl/userfiles/file/55865419634.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608e444b917cd---63881432972.pdfIn PDF document text
    • http://thetuckerfamilyreunion.com/clients/67950/File/13838044829.pdfIn PDF document text
    • http://gld-lining.com/user_img/files/zaxax.pdfIn PDF document text
    • https://keluargamimpi2.com/contents//files/21410591193.pdfIn PDF document text
    • http://wujipacking.tw/upload/files/juruzewutiwoni.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/99bbc2d7a2f5c57dcc8d65f3bd471009/lutopafoxi.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b503f7b511a---kijevod.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/12971732195.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/697e4db594a7ae6447ef88af39262d76/kinizum.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/a2f5ci32fb4e8rs6mc9dq2bm3a/71982500064.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160c067ea8264b---ropedufe.pdfIn PDF document text
    • https://rosedreamholidayhomes.com/ckfinder/userfiles/files/gefixobidogomijeti.pdfIn PDF document text
    • https://shoreluxurylimos.com/userfiles/files/meregukuxekipikezof.pdfIn PDF document text
    • http://starlightcelebre.org/clients/4/43/43e9139217482d7666ce300faf566241/File/44616904594.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608f71e6abaeb---tolozomiwives.pdfIn PDF document text
    • https://bamor.org/userfiles/file/gimipigifebifebilaf.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/66784761280.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_off0000eaa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA6 17896 bytes
SHA-256: 9d346324903b6bb882d8bd1c0464047f73d1e4d0145269d199d462d4eb6d2144
font_01_sfnt_off000118a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000130b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130B7 11000 bytes
SHA-256: 97de2e8b19837c981e0362b4e1f58a4e289e08ea3fd4c67f2c328356ffde78b7