Malicious PDF — malware analysis report

Static analysis result for SHA-256 f88eee927b4fa224…

MALICIOUS

PDF

86.6 KB Created: 2021-09-13 22:19:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b3aa2023d1b26b42774f585afe36d97c SHA-1: 486bc98ab2b883bb8213c3ca121b64771c5350d9 SHA-256: f88eee927b4fa224cb57485ac1606d3af6be12834547a41d37db19e6c00fd5f5
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and a machine learning model assigned a high probability of maliciousness. Heuristics indicate the document functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and disposable hosting. These links likely serve to redirect users to malicious sites or to manipulate search engine rankings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://wastran.ru/uplcv?utm_term=love+shayari+girlfriend+ke+liye PDF link annotation
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/8dced695237a26e28b7e8bfe0a99e122/denafamitulu.pdfIn PDF document text
    • http://historia-bfured.hu/userfiles/file/94289408556.pdfIn PDF document text
    • https://nomortiga.com/contents/files/gujisu.pdfIn PDF document text
    • https://maintogelonline.info/contents/files/23875813686.pdfIn PDF document text
    • https://tainandentist.com/uploads/files/202109082025099007.pdfIn PDF document text
    • https://0955205219.jwa.tw/userfiles/files/lasiga.pdfIn PDF document text
    • http://bundoreh.com/fckeditor/files/file/didikilujotidir.pdfIn PDF document text
    • https://efckrakow.pl/userfiles/file/nuxagakosugajez.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137c80298a11---2931585236.pdfIn PDF document text
    • https://yenhuy.vn/upload/files/96058346690.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/4144647047.pdfIn PDF document text
    • http://conditum.nl/userfiles/file/kifezetomax.pdfIn PDF document text
    • http://hoangnampte.vn/quangbasanpham/app/webroot/upload/image/files/68133071935.pdfIn PDF document text
    • http://ambcavallon.eu/userfiles/files/zamefikan.pdfIn PDF document text
    • https://sarenpinler.com/calisma2/files/uploads/70348072747.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/rozabirotaruxanojudavujif.pdfIn PDF document text
    • http://vagtteam.com/userfiles/Files/72881553148.pdfIn PDF document text
    • http://remont-m.com/userfiles/file/78554885253.pdfIn PDF document text
    • http://thestarbusan.net/FileData/ckfinder/files/20210913_8600FFF73340A69E.pdfIn PDF document text
    • http://www.mustwalge.ee/data/content/files/17996095226.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/c29908246ae16a4a52911de0d798cd61/nozof.pdfIn PDF document text
    • http://madinagirls.com/easydo%20v2.00/files/uploads/26883629403.pdfIn PDF document text
    • http://centonze-vini.com/userfiles/files/kovatelijaf.pdfIn PDF document text
    • https://hotelcorona.ro/files/lokimopig.pdfIn PDF document text
    • http://smenergy.kr/uploaded/file/196582420861309f278a686.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_off0000ecbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECBD 10764 bytes
SHA-256: d36434c5144af684fb9ba2742fc0bc5ba24af1db2c15fd368580a6953ec09d7d
font_01_sfnt_off00010542.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10542 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D54 18504 bytes
SHA-256: 9ff4d1191fab071906ddb0268a7096739a21f98ebc291faa4b879e5826771704