Malicious PDF — malware analysis report

Static analysis result for SHA-256 d43d40f63808b4f7…

MALICIOUS

PDF

67.8 KB Created: 2021-09-29 10:50:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: f2c0350e45d361640fd2e65f02b6c7c4 SHA-1: 915b50508620aa991ad49be2744f8c54eeed520b SHA-256: d43d40f63808b4f747ed5eeadb9eb7635923fbd9bea99003128dd7f6afcaa1e8
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document contains a link farm pointing to various websites, some of which are hosted on compromised CMS upload storage. The primary purpose appears to be directing users to potentially malicious or phishing content through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://taixingchem.com/uploadfile/file/20210909182233682.pdf In PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/26e53683e34646398d374acaf1114961/tijujumupesilaxebem.pdfIn PDF document text
    • https://renebeumer.nl/userfiles/file/95061561032.pdfIn PDF document text
    • https://www.syria-report.com/sites/all/libraries/ckfinder/userfiles/files/fekekolazewumilu.pdfIn PDF document text
    • https://ensegun2.com/ckfinder/userfiles/files/gerixonuralisosonuvuxozar.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/65500ccc69c60701dff1e5112ae9ce0d/12064793760.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/denedekitaju.pdfIn PDF document text
    • https://fortworthdental.net/cmsCart/upload/file/29708468032.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/93193599268.pdfIn PDF document text
    • http://mosme.org/uploadfile/files/bepoxutivop.pdfIn PDF document text
    • http://martonaroniskola.net/userfiles/file/9153427694.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/42351598682.pdfIn PDF document text
    • http://clevio.biz/fckUpload/file/37509263435.pdfIn PDF document text
    • http://balie.overeembv-profielen.nl/upload/files/rebutivenajarafaxuva.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/4a693ad182fffe3d5e01301586f86bdd/zekoretatazu.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16137709ee13a5---38731376187.pdfIn PDF document text
    • https://webmakler.org/userfiles/file/jabugedisi.pdfIn PDF document text
    • http://muntepa.com/userfiles/files/tuzikixetekamesitipubusa.pdfIn PDF document text
    • http://eotp.info/sites/default/files/fck/file/mavuwugidoguganiz.pdfIn PDF document text
    • http://baovethanglongmb.com/upload/files/bivaladasulopasutafujapon.pdfIn PDF document text
    • https://dodomacnosti.net/data/file/repenudulujawubeb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=algebra+1+pearson+answer+keyPDF 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_off0000ad18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD18 14516 bytes
SHA-256: 4ce30fd51c93a095c810a7aa5919367f23ae37ab4149d45237fea1e703f4a5db
font_01_sfnt_off0000d153.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD153 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e96a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE96A 10700 bytes
SHA-256: 46ae0a65e9d5cda87e9d956fc9f9ba8a1918482b75e4f55010d6ed3da61babd9