Malicious PDF — malware analysis report

Static analysis result for SHA-256 aef65e0957bcc82d…

MALICIOUS

PDF

84.0 KB Created: 2021-08-30 07:27:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c0da38d5e0ed86bcad11fec0d5d0e7ca SHA-1: 7eca33abeb6c41d3103efdb1b75c713269280ce1 SHA-256: aef65e0957bcc82d35903929da110b789c8579436ba73f6eb2725e5d0b191010
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate it functions as a link farm, directing users to multiple compromised or disposable hosting sites, likely to distribute further payloads or conduct phishing. The presence of numerous PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://cycling-software.com/files/file/vagutadoturanum.pdf In PDF document text
    • http://tropo-design.com/ckfinder/userfiles/files/31488650749.pdfIn PDF document text
    • https://ikansambel.com/contents//files/60929691328.pdfIn PDF document text
    • http://bethanybaptistcolumbus.org/clients/75549/File/44602232387.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/f4b562e5d33cdc9ef45d600e4d86cc88/sezuwoneverirepilopud.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c4613441af2---kupulolejawifitigome.pdfIn PDF document text
    • http://jcaf.or.kr/ckfinder/userfiles/files/72150827065.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/16129212498e73---66792718606.pdfIn PDF document text
    • http://xn--b1adcbbai1bezln.xn--p1ai/content/File/2825236325.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/5a3439576ac7b0747c398b4815088cb1/41289841633.pdfIn PDF document text
    • https://lavineriablend.it/file/logiwepezomotewot.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/fd41ec1ba405c01237c1abcd2f34d8a6/wuvibomojogalinuxa.pdfIn PDF document text
    • http://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/52040608436.pdfIn PDF document text
    • https://istocdukkan.com/userfiles/files/32459401472.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/74407590897.pdfIn PDF document text
    • http://shs1977reunion.com/clients/41590/File/tuzubogolerokid.pdfIn PDF document text
    • https://osakaav.com/userfiles/files/lewomuvigonadozugonedorew.pdfIn PDF document text
    • http://ledson.ru/upload_picture/63502858211.pdfIn PDF document text
    • http://www.me.ntou.edu.tw/ckfinder/userfiles/files/20210807_184826.pdfIn PDF document text
    • http://duocmyphamcongty.com/app/webroot/uploads/files/suvimojotofilidimopoki.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/41937210480.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/060d0917e439b3c37c2e633ef94964d5/ninasajezenesax.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/56993878106.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/32044168972.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=what+i+learned+from+this+lessonPDF 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_off0000e2ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2EE 17592 bytes
SHA-256: f175ee60faea79d8b4527e0aff5a8fb16eff905213a683bb335e851d33a62368
font_01_sfnt_off000110bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110BF 10612 bytes
SHA-256: 5131bda3dafe23df8343e3fa8f175943fd630e67c417ae7ca20c53219096042b
font_02_sfnt_off000128d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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