Malicious PDF — malware analysis report

Static analysis result for SHA-256 e13fc1a6a46770a3…

MALICIOUS

PDF

82.3 KB Created: 2021-09-23 02:12:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4827364a403378b9751b5425b2f68729 SHA-1: e9369b9e6c0364d4c714a74c0e1cc37bed878d66 SHA-256: e13fc1a6a46770a33db8871e235d39b7da8d9303eba47524f35669343724beed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and link farm heuristics, indicating an attempt to redirect users to potentially harmful websites. The presence of these links suggests the document's primary purpose is to facilitate access to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crewmak.ru/uplcv?utm_term=7+sport+live+stream PDF link annotation
    • https://aqua2go.pl/galeria/file/7215396618.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/xosibujadozuromufodi.pdfIn PDF document text
    • http://dataprint.ie/uploads/file/21224466550.pdfIn PDF document text
    • https://pfhotel.gr/ckfinder/userfiles/files/dokofenojikatipi.pdfIn PDF document text
    • http://hoangnampte.vn/quangbasanpham/app/webroot/upload/image/files/talos.pdfIn PDF document text
    • http://meghdoothsuzuki.com/uploads/35266955332.pdfIn PDF document text
    • http://vipforiraq.com/userfiles/files/78164627618.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e59cb429e0---90981277341.pdfIn PDF document text
    • http://lammensfilip.be/uploads/files/79295373173.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/s0m638jiabrbgk8td35cskuped/joganigodivukoraxen.pdfIn PDF document text
    • http://esenkardeslerinsaat.com/resimlerfiles/vokim.pdfIn PDF document text
    • https://samirkumarpaul.com/ckfinder/userfiles/files/kebirejuziz.pdfIn PDF document text
    • http://caerulumpharma.com/upload/files/xudonugobotalilax.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142e4d57ef2a---nuzowug.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/807b16e1b034507eafdf78e8beec82c0/61085410103.pdfIn PDF document text
    • https://hinodanang.com/uploads/image/files/wolimujuwimogad.pdfIn PDF document text
    • http://mail-business.ru/uploads/file/nesefibunemetojogezoji.pdfIn PDF document text
    • https://booburger.myagenda.cz/pictures/editor/files/47874473440.pdfIn PDF document text
    • https://www.syria-report.com/sites/all/libraries/ckfinder/userfiles/files/2884941797.pdfIn PDF document text
    • http://china-baby-clothes.com/d/files/bidow.pdfIn PDF document text
    • https://homestayhoian.vn/uploads/image/files/ritusizegimivopowijo.pdfIn PDF document text
    • https://cristalparkhotel.com.ve/ckfinder/userfiles/files/rofuj.pdfIn PDF document text
    • http://jubangh.com/Upload/FckUpload/20210914file///31858264292.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_off0000df4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF4E 17392 bytes
SHA-256: 56d4b566a6b054e1bf9f94d5497b84c21e0931500c2ffef930a78075142ce76a
font_01_sfnt_off00010c67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C67 10328 bytes
SHA-256: 3d9e52b607d5925e599236e2dab92616a2c7325a5b7656dc8089211e6d12f36e
font_02_sfnt_off000123c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1