Malicious PDF — malware analysis report

Static analysis result for SHA-256 544b3dd3b5e9f56f…

MALICIOUS

PDF

75.0 KB Created: 2021-09-09 06:44:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: dbd8ae12782fc6fb3c67ea32c240e2fd SHA-1: d319e5bb385e4b126d7e87339afda11483ec8a76 SHA-256: 544b3dd3b5e9f56f87f26b7b0c818edb4cd1ece60e77b32ce13d19f108bd221a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised or disposable domains, a common tactic for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. The presence of external URIs and link farms suggests the document's primary purpose is to redirect users to malicious content, likely for credential harvesting or further malware deployment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://oniceh.ru/uplcv?utm_term=download+certificate+for+android PDF link annotation
    • http://bortran.com/upload/image/file/20210909100345.pdfIn PDF document text
    • https://k-barrierfree.com/FileData/ckfinder/files/20210902_EAA666C94316C7ED.pdfIn PDF document text
    • http://wasserentkalkung.at/ckfinder/userfiles/files/pokakazorija.pdfIn PDF document text
    • https://bucatariizidite.ro/printuri-fi/files/folisaxexu.pdfIn PDF document text
    • http://cosyromania.com/media/file/21903440369.pdfIn PDF document text
    • http://oletrans.sk/editor_uploads/files/jisatipusewazagepe.pdfIn PDF document text
    • https://motodubai.com/uploaded_images/files/luderudedera.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/059449049c3e55b051c4f3918522cf44/datuzifira.pdfIn PDF document text
    • http://aktifithalat.com/resimlerfiles/11306324706.pdfIn PDF document text
    • http://fuguchair.com/upfolder/e/files/20210902060430.pdfIn PDF document text
    • http://zulassungsdienst4you.de/bilder/file/80916602772.pdfIn PDF document text
    • http://dakdekkersindex.nl/images/uploads/89296468187.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1612fcaa602b0b---73579490956.pdfIn PDF document text
    • https://autohausnschmidt.de/userfiles/file/24564031517.pdfIn PDF document text
    • https://ikuseikyokai.jp/ckmedia/files/7010164941.pdfIn PDF document text
    • https://cosanuesa.com/componentes/editor/ckfinder/userfiles/files/jikogukuwifoko.pdfIn PDF document text
    • https://coolingrealestate.com/your-home-cleaner/FCKuploads/file/vaxinuwaxexufa.pdfIn PDF document text
    • https://petala.gr/userfiles/file/6876339353.pdfIn PDF document text
    • https://pikhospital.com/ck_uploads/uploads/files/28004609027.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135e532225a9---2420040628.pdfIn PDF document text
    • https://grafconsulting.pl/Upload/file/futulod.pdfIn PDF document text
    • http://fujieshubao.com/zk/UploadFile/file/2021090901300473499.pdfIn PDF document text
    • http://ottomaniantextile.com/userfiles/file/fepejalukikokofi.pdfIn PDF document text
    • http://dlzhrjd.com/images/uploadfile/files/vinapek.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f118e04c01---fogelepikefufomadugafu.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_off0000bf96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF96 18232 bytes
SHA-256: 5b151d46722e8ecc0e2671014fb2d0f5e37fe4da8020da0cf94b51cae17c0918
font_01_sfnt_off0000eeb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB9 10388 bytes
SHA-256: 38035ac57d7564f6926ab1387902e584e247c3bf2fb32bdcb5e8dd2c8e143370
font_02_sfnt_off00010662.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10662 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1