Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d4a7a806e95899c…

MALICIOUS

PDF

71.5 KB Created: 2021-09-20 01:07:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6fbc9e2ce675ae2fe0a4637a540844c4 SHA-1: 0c8fc712c7389196e84a516b5add31bb78620edb SHA-256: 8d4a7a806e95899c906a93a00742dce56ab21a09aebd4a77fa6dc813e7406bd0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple external URLs, some hosted on potentially compromised CMS uploads. The embedded URLs suggest an attempt to lure users to sites that may host further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://krukaiart.com/userfiles/files/femoposunufefaxomalo.pdf In PDF document text
    • https://www.vita-organic.eu/admin/ckfinder/userfiles/files/54106416321.pdfIn PDF document text
    • http://xn--2e0b30g3uq7pay7m.com/upload/fckeditor/file/tegezenividoru.pdfIn PDF document text
    • http://nktrading.qa/file/files/46475419598.pdfIn PDF document text
    • https://etravelbox.com/scgtest/team-explore/uploads/files/komulepetiribuzimelujuli.pdfIn PDF document text
    • http://rwdwebwebdesign.com/img-aim/files/delilu.pdfIn PDF document text
    • https://psychotherapie-coeppicus.ch/userfiles/files/91403789761.pdfIn PDF document text
    • https://nsaimmigration.com/userfiles/file/verivemimomereluf.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/49736313024.pdfIn PDF document text
    • http://sinosteelcode.com/filespath/files/20210917105023.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16137a130c2ea6---79408604614.pdfIn PDF document text
    • http://happinessgown.com/upload/users/files/fulimapus.pdfIn PDF document text
    • http://chinalabware.es/d/files/58627467754.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613666551793b---tugamerebiguduzodage.pdfIn PDF document text
    • http://9275522-travel.com/userfiles/file/xudisilakixusamor.pdfIn PDF document text
    • http://tieuhocsondong.hoaiduc.edu.vn/ckfinder/userfiles/files/sowinavizoputomajone.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/a2c60autqmn2rijnfgn470esj5/natosilerumenani.pdfIn PDF document text
    • http://maciejabramowicz.pl/upload/files/file/87265591598.pdfIn PDF document text
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/matuv.pdfIn PDF document text
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/69677649860.pdfIn PDF document text
    • http://baoveantam.info/upload/files/rinebomoxaxekuwukidapodij.pdfIn PDF document text
    • https://armour-technoz-ca.otzol.net/ckfinder/userfiles/files/vefanamugegusosej.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/16135730c80da2---ridokufizitokesofisad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=legend+of+zelda+android+apkPDF 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_off0000b732.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB732 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF44 16164 bytes
SHA-256: 4d7ce1c7cdc958668b15fbe7ed5b7a54b64d4fdcc5b593438e88a66d9b3ecd10
font_02_sfnt_off0000f844.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF844 10516 bytes
SHA-256: 0a27ac8a9a4d59676d967f26458f4437fb07d6a40f477cb670be8321a8e7e296