Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b800a0d8d59917c…

MALICIOUS

PDF

81.8 KB Created: 2021-09-15 19:10:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a803adfe38c52c9a62d7fd2cdeb8c531 SHA-1: e9ab0a3c3b2a2e44b375faa0f5e30ccab8788f59 SHA-256: 6b800a0d8d59917c9de82bd291a0082129da11d2d4bdd3e7447dabe1fe1fcbb4
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a link farm pointing to multiple disposable hosts, indicating an attempt to distribute malicious content. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic suggests the document is designed to trick users into downloading a password-protected archive, likely to bypass security scans. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://tetobox-budapest.hu/uploads/files/wokufeketuzexolotuvapiv.pdf In PDF document text
    • https://gtnet-engine.com/ckfinder/userfiles/files/6565031969.pdfIn PDF document text
    • http://wangguanhardware.com/userfiles/file/bimajirekawirasubij.pdfIn PDF document text
    • https://matfplayer.com/calisma2/files/uploads/jutovefave.pdfIn PDF document text
    • https://xn--z4qq44i.tw/upload/actfiles/lamiburuxokixoxober.pdfIn PDF document text
    • https://partroyfuneralhome.com/partroy/assets/file/zatusijulilexawopegefa.pdfIn PDF document text
    • http://amsaneeraus.fi/userfiles/files/xowunitemevosa.pdfIn PDF document text
    • http://interiorsexpress.biz/dayafter/uploadimages/newsimages/file/6640981594.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/5e8c3302030ca257f61c948994ba198c/10843424846.pdfIn PDF document text
    • http://investgeorgia.ge/userfiles/file/foderunem.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136b6c0862a5---59590997759.pdfIn PDF document text
    • https://www.sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/bakawexibenoriwapon.pdfIn PDF document text
    • http://dietetyka-24.pl/images/files/mofupakabitoxevi.pdfIn PDF document text
    • https://llbyggodesign.se/UserFiles/files/88404847031.pdfIn PDF document text
    • https://www.miotsukushi.or.jp/system/ckfinder/userfiles/files/gamarubinelebibaguvazul.pdfIn PDF document text
    • http://henanshuangxin.com/d/files/jaxapasose.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/9ng8tgnv5iff111mgsgtobdil7/42305520437.pdfIn PDF document text
    • http://kraemer-duennebacke.de/files/file/81976253104.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/43431046234.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/ebb793cb3a59b796ed63b7d6df960eb1/kuvuvitoxab.pdfIn PDF document text
    • http://willbramephotography.com/pobemizatawu.pdfIn PDF document text
    • https://wigs4less.net/nbloom/fckuploads/file/zuzufabare.pdfIn PDF document text
    • https://toolsatool.com/userfiles/files/relokofuwen.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/161339a978f4b9---vadaramarunogerozebezox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=how+to+block+safe+mode+on+androidPDF 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_off0000dac7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC7 10944 bytes
SHA-256: 5287c7d353192697a724e432ce1fb965ad440bbd40928dddf739952fca0dc034
font_01_sfnt_off0000f431.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF431 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C43 17716 bytes
SHA-256: 54a1cad2f5216ff146c1b812a7d1b74177ebd35c5a9e0b350864e2708e4d6202

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