Malicious PDF — malware analysis report

Static analysis result for SHA-256 89017957e8d5d751…

MALICIOUS

PDF

83.2 KB Created: 2021-10-05 12:33:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 39bf51bda588dcbfe4886f5ae4ec7ff9 SHA-1: d0985d28a4699ec4b3b3a99c8d38a33ca67b3b30 SHA-256: 89017957e8d5d751e8dc51fc82741b6dc74b86a39c1bb7237c8dba3e892b23fb
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. Numerous heuristics indicate the document functions as a link farm, directing users to various external websites, many of which are hosted on disposable or compromised domains. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings strongly suggests a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://irlanc.ru/uplcv?utm_term=y+in+military+alphabet PDF link annotation
    • http://vinaktv.com/storage/ckfinder/files/74635241327.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16142729c29dc2---30998759688.pdfIn PDF document text
    • http://webspace.mysdam.net/images/newsletter/files/15334264157.pdfIn PDF document text
    • https://kettosallampolgarsag.net/imagini_ws/luxake.pdfIn PDF document text
    • http://101-games.ru/images/uploads/files/pukujaguzevi.pdfIn PDF document text
    • http://esangsok.com/upfile/files/rejujufilitoliwaxirudaga.pdfIn PDF document text
    • http://simp-q.ru/userfiles/file/47423568273.pdfIn PDF document text
    • http://maidichike.com/upload/files/sanodedulanopid.pdfIn PDF document text
    • https://tessuno.com/upload/files/61395f7df2dcf.pdfIn PDF document text
    • http://czyxchem.com/upload/files/jaripoviv.pdfIn PDF document text
    • http://www.abcklima.hu/data/editorfile/96580918552.pdfIn PDF document text
    • http://nextlab-semi.com/files/fckeditor/file/88596565285.pdfIn PDF document text
    • http://intelekt.biz/uploads/pages/files/58048757313.pdfIn PDF document text
    • http://tercovci.cz/files/file/65418917864.pdfIn PDF document text
    • http://aodaiminhhanh.com/app/webroot/uploads/files/10184204512.pdfIn PDF document text
    • http://cnpair.com/userfiles/file/buwav.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/1d3b9d528fb8de9d59e7467e3d8e3acf/62752162621.pdfIn PDF document text
    • https://malayalamfoundation.org/admin/my_files/file/32101769103.pdfIn PDF document text
    • http://southerncross-ex.com/images/blog/file/vuvafowisuriwixapifofa.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1615348bb2168e---62036091454.pdfIn PDF document text
    • http://acsalma.hu/userfiles/files/1583217657.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/57766522588.pdfIn PDF document text
    • https://chief-moving.com/editor_upload/file/27254814039.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_off0000ddf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF1 10464 bytes
SHA-256: f228f565e5b45ae183d3d1f6b5b64e7573da817d407bbb2ef6df4e537d038ec5
font_01_sfnt_off0000f52e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF52E 19320 bytes
SHA-256: 87fd98f1373492e1eed5600ff366ab6a01a596a21ca278bc913bc2848f5ad485
font_02_sfnt_off00012766.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12766 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1