Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ebb2290fd5b2e78…

MALICIOUS

PDF

87.0 KB Created: 2021-09-14 11:01:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5b685cd014c1bfa2458584e681967e2f SHA-1: 1b4b7b777fea392229957d71e0188afe99cb5057 SHA-256: 1ebb2290fd5b2e78d9c06b5b9101ed6f4b57e3e743a87bc215489f22523d46cb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised or disposable hosting sites. The embedded URLs, such as 'https://pixomot.ru/uplcv?utm_term=android+photo+editor+tutorial', are likely used to distribute further malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://pixomot.ru/uplcv?utm_term=android+photo+editor+tutorial PDF link annotation
    • http://dubilex.com/userfiles/files/wepavozijoromakufalav.pdfIn PDF document text
    • http://ediliziaunoaventi.com/userfiles/files/gugubavoperowerewinutusam.pdfIn PDF document text
    • http://peter-scherer.de/userfiles/file/bikiruwaxirutima.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130998b01514---fagetejebobefuf.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/1d010b827d67a4647ca32411d8de7b2b/turaxejaf.pdfIn PDF document text
    • https://groupburuemas1.com/contents/files/fowof.pdfIn PDF document text
    • http://zssadkowice.pl/pliki/kurakadaba.pdfIn PDF document text
    • https://www.info-service.com.tw/plugin/ckeditor/ckfinder/userfiles/files/14633219939.pdfIn PDF document text
    • http://nakakinpump.kr/fckeditor/upload/file/bozad.pdfIn PDF document text
    • https://repairbase.net/FCKeditor/editor/filemanager/connectors/php/images/file/73129059535.pdfIn PDF document text
    • http://first-group.kr/ckupload/files/88154714592.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16136cffa512b4---nogifibuzezu.pdfIn PDF document text
    • http://bdpq.hungminhits.com/files/uploaded/files/rejavoxuzokakirosulu.pdfIn PDF document text
    • http://szkolaprywatnaleszno.pl/userfiles/file/nomafurirub.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fcb34e48f3---niguji.pdfIn PDF document text
    • http://smsgurugram.com/miet/assets/files/vezofik.pdfIn PDF document text
    • http://blackivy.pl/userfiles/file/wonumad.pdfIn PDF document text
    • http://miyozenemeryville.com/uploads/files/26291161821.pdfIn PDF document text
    • https://ldoris.com/upfile/files/20210914061932.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613046c7e3532---45547147712.pdfIn PDF document text
    • https://shibbirs.com/media/files/58778400989.pdfIn PDF document text
    • http://bm-shower.com/userfiles/files/bomovi.pdfIn PDF document text
    • http://bzws.zhanyougame.com/ckfinder/userfiles/files/xujafonaferijatexigusaw.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/faxabipuper.pdfIn PDF document text
    • http://mecaniquekd.ca/upload/file/xixadekixexikegibufekat.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_off0000f00b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF00B 18280 bytes
SHA-256: 6760b25ea91e9e2fe2ffef52b34fb8dc1de574b2c31f5e8c996613d26ffd0a46
font_01_sfnt_off00011ef3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001370a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1370A 10400 bytes
SHA-256: a99703e820f99f1b4bbf6e88c96fc1912b1ea71fcbe2fc4148bc40658aa27e5d

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