Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e845c51e4bd7ef9…

MALICIOUS

PDF

76.3 KB Created: 2021-09-24 23:04:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 310fb265e8d3d7bfd7766614ccb5d9a6 SHA-1: fa519e3f060b145711cf29e94f4f5e0c99e18b0e SHA-256: 0e845c51e4bd7ef9cdaa67ca959dc3b131f348e9d6c140564748fd4f140447fc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The presence of numerous external links, many pointing to potentially compromised or disposable hosting, strongly suggests a phishing or malware distribution attempt. The ClamAV detection and ML classifier further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://icaalliance.org/filespath/files/20210920115605.pdf In PDF document text
    • https://www.vek-bg.com/app/templates/js/ckfinder/userfiles/files/ralose.pdfIn PDF document text
    • https://villatoscana-pi.it/userfiles/file/rovarusa.pdfIn PDF document text
    • https://ripedzn.com/app/webroot/files/fckeditor/file/72230879627.pdfIn PDF document text
    • https://yukkumpulgroup1.com/contents/files/segikosokagizazude.pdfIn PDF document text
    • https://phatgiaolongan.com/upload/ckupload/files/70206553655.pdfIn PDF document text
    • http://tangiahoang.vn/Images_upload/files/30179122281.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/cf6aade1ecab72695ec7740eb650c0de/91004172371.pdfIn PDF document text
    • http://abwingsjanaf.com/uploads/files/veluwekifeji.pdfIn PDF document text
    • http://slmj8.com/data/userfiles/files/movopalubopa.pdfIn PDF document text
    • https://firmabudowlanawalczak.pl/web/uploads/files/memojajaresu.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614c1e759f5f7---70416631049.pdfIn PDF document text
    • https://dnm.tw/uploads/files/202109220903338203.pdfIn PDF document text
    • http://potentialdesign.cn/userfiles/file/1631602451.pdfIn PDF document text
    • https://kaptenhoki.info/contents/files/vuxenagi.pdfIn PDF document text
    • http://likebarcode.com/image/files/20210905_055119.pdfIn PDF document text
    • http://yonezawanet.jp/units/24250/zcycom/files/2595490153.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/61i7undlioqjhsg91dj5o5hihp/41960361138.pdfIn PDF document text
    • https://pomacanthe-art.fr/imagebeforeafter/files/63673772653.pdfIn PDF document text
    • http://cbcom.fr/ressource/site-image/files/39165639428.pdfIn PDF document text
    • http://keitbg.com/images/files/56611527948.pdfIn PDF document text
    • http://anapro.com/ckfinder/userfiles/files/59570549446.pdfIn PDF document text
    • http://palenice.net/obrazky_clanky/file/94555984089.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=panzer+cheat+in+gta+5+pcPDF 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_off0000be97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE97 10512 bytes
SHA-256: 183b89bb34af73d879004e48cab878e1bc8ccce37ede14806eb554a6fa42a400
font_01_sfnt_off0000d689.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD689 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ee9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE9B 19804 bytes
SHA-256: ca126d6ff135ddbfd36e6ac5df72ee1d325ef4cfc4824c2d70131e78626fdb60

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